当前期刊: Separation and Purification Technology Go to current issue    加入关注   
显示样式:        排序: 导出
我的关注
我的收藏
您暂时未登录!
登录
  • Matchstick-like metal-organic framework-based superwetting materials for efficient multiphase liquid separation via filtration or adsorption
    Sep. Purif. Technol. (IF 5.107) Pub Date : 2020-01-20
    Yuanyuan Hou; Mingming Liu; Liping Zhang; Min Li; Dong Wang; Jingyan Liu; Shaohai Fu
    更新日期:2020-01-21
  • Synergistic degradation of chloramphenicol by ultrasound-enhanced nanoscale zero-valent iron/persulfate treatment
    Sep. Purif. Technol. (IF 5.107) Pub Date : 2020-01-20
    Tingting Zhang; Yanling Yang; Jingfeng Gao; Xing Li; Haikuan Yu; Nan Wang; Peng Du; Rui Yu; Hang Li; Xiaoyan Fan; Zhiwei Zhou
    更新日期:2020-01-21
  • Selective removal of chloride ions by bismuth electrode in capacitive deionization
    Sep. Purif. Technol. (IF 5.107) Pub Date : 2020-01-20
    Junjun Chang; Yuping Li; Feng Duan; Chunlei Su; Yujiao Li; Hongbin Cao
    更新日期:2020-01-21
  • Design and control of a novel side-stream extractive distillation column for separating methanol-toluene binary azeotrope with intermediate boiling entrainer
    Sep. Purif. Technol. (IF 5.107) Pub Date : 2020-01-20
    Chao Wang; Yu Zhuang; Linlin Liu; Lei Zhang; Jian Du; Zhishan Zhang

    It is innovative and important to perform complex binary azeotrope separation via single distillation column. In the article, design and control of a novel and simple side-stream extractive distillation (SSED) column with extraction and solvent recovery function is investigated for the separation of methanol and toluene binary azeotrope with intermediate boiling triethylamine (Et3N) as solvent. The steady-state design parameters of the novel SSED column are optimized and obtained with the objective of minimal total annual cost (TAC) via conventional sequential iterative procedure. On the basis of steady-state design, four single-end temperature control structures (STCS), four dual-temperature control structures (DTCS) and four dual-composition control structures (DCCS) are developed and established successively to overcome the operation and control challenges caused by the novel scheme. To seek the robust control, the dynamic performance analysis on account of the above control structures is conducted for the SSED column, which is evaluated for feed flowrates and composition disturbances. The results show that the control performance of DCCS is significantly superior to that of STCS and DTCS while the integral squared error (ISE) and energy-consuming effect are equivalent, and can take shorter time to bring the product purities back to the original steady state in coping with specified feed disturbances.

    更新日期:2020-01-21
  • Evaluation of electrostatic properties of electret filters for aerosol deposition
    Sep. Purif. Technol. (IF 5.107) Pub Date : 2020-01-20
    Maximilian Kerner; Kilian Schmidt; Stefan Schumacher; Vanessa Puderbach; Christof Asbach; Sergiy Antonyuk
    更新日期:2020-01-21
  • 更新日期:2020-01-21
  • 更新日期:2020-01-21
  • Treatment of laundry wastewater containing residual surfactants using combined approaches based on ozone, catalyst and cavitation
    Sep. Purif. Technol. (IF 5.107) Pub Date : 2020-01-18
    Vishal V. Patil; Parag R. Gogate; Akash P. Bhat; Pushpito K. Ghosh

    The present work investigates the treatment of wastewater by degrading detergents and residual surfactants using individual and combined approaches based on ozone, catalyst and cavitation. The intensification of ozonation has been investigated by the addition of solid ZnO and CuO catalysts. The extent of degradation increased with catalytic ozonation as compared to non-catalytic ozonation. In comparison, the combination with cavitation did not yield any beneficial results. The study of the effect of initial pH of the solution and effect of different catalyst loadings in catalytic ozonation with ZnO established that the maximum degradation as 89.3 % was obtained at initial pH of 9 and 0.1 g L-1 of catalyst loading respectively. It was also demonstrated that the reaction followed first order kinetics with rate constant as 0.067 min-1. BOD analysis at optimized conditions demonstrated that catalytic ozonation efficiently converts non-biodegradable harmful surfactants in wastewater to easily digestible compounds, which means that this can be a complimentary process to biological oxidation. Overall the work has clearly demonstrated the efficacy of catalytic ozonation approach for treating the laundry wastewater.

    更新日期:2020-01-21
  • Salting-out extraction of acetoin from fermentation broths using hydroxylammonium ionic liquids as extractants
    Sep. Purif. Technol. (IF 5.107) Pub Date : 2020-01-18
    Yan Li; Jian-Ying Dai; Zhi-Long Xiu

    The salting-out extraction (SOE) systems based on ionic liquids (ILs) have attracted extensive attention in the separation of bio-based products, in which imidazolium ILs were widely studied. However, the high cost and toxicity have hindered their further industrial application. Hydroxylammonium ILs have the characteristics of cheap raw material, simple synthesis process and low toxicity, but are rarely used in the SOE systems. In this work, five hydroxylammonium ILs (2 cations and 4 carboxylate anions) were synthesized and used in SOE of bio-chemicals. The phase forming abilities of ILs with K3PO4 and H2O were affected by the hydrophilicity of anions and cations. With the increase of carbon chain length, phase forming abilities of ILs increased, while the temperature had little influence. The partition behaviors of acetoin, ILs and 2,3-butandiol, and the selectivity of acetoin to organic acids were investigated and compared at different concentrations of ethanolammonium butyrate (EOAB) and K3PO4. In a SOE system consisted of 6% EOAB-38% K3PO4 (w/w), the recovery of acetoin, IL and 2,3-butandiol was 92.7%, 76.0% and 86.0%, respectively, and the selectivity of acetoin to lactic acid and acetic acid was 16.46 and 3.85, respectively. The ATR-IR spectra showed the hydrogen bonds formed between acetoin and O-H, N-H, -COO- of hydroxylammonium IL played an important role in the efficient extraction of acetoin from fermentation broths.

    更新日期:2020-01-21
  • 更新日期:2020-01-21
  • 更新日期:2020-01-21
  • 更新日期:2020-01-21
  • Fouling resistance of 3-[[3-(trimethoxysilane)-propyl] amino] propane-1-sulfonic acid zwitterion modified poly (vinylidene fluoride) membranes
    Sep. Purif. Technol. (IF 5.107) Pub Date : 2020-01-18
    Wentao Zhai; Mengliang Wang; Jianfeng Song; Lin Zhang; Xue-Mei Li; Tao He

    Zwitterion polymer modified membranes have demonstrated fouling resistance in wide applications. The ubiquitous success in scientific progress, however, has not yet brought significant breakthrough in the application of such membranes in wastewater treatment. Limitation of zwitterion materials in membrane is seldomly discussed. In this paper, we aimed to bring an engineering view on the pros-and-cons of zwitterion modified microfiltration membrane in treating solutions containing humic acid (HA) and bovine serum albumin (BSA). A 3-[[3-(trimethoxysilane)-propyl] amino] propane-1-sulfonic acid (TMAPS) grafted zwitterionic PVDF membrane was selected as a model membrane. The membranes were prepared via a two-step “hydroxylation-grafting” method; surface modified PVDF membrane was transformed from hydrophobic to hydrophilic with significant improvement in pure water flux. An 87% increase was obtained in the stable flux for the grafted membrane when treating HA, but very similar flux pattern to the pristine one was found when treating BSA. The membrane resistance model showed that cake layer was the main fouling factor for both foulants. For HA, the cake layer blocking model predicted the membrane flux well; but for BSA, the intermediate blocking model fits best the experimental results. Zwitterion grafted surface failed to show improvement in the fouling resistance even at very low BSA feed concentration. Adsorption experiment indicated that the interaction of BSA to membrane is significantly stronger than HA and membranes independent from the surface characteristics. Present work clarified the limitation of zwitterion modified membranes in treating solutions containing HA-like and protein matters.

    更新日期:2020-01-21
  • Carbon Nanotubes in-situ Cross-linking the Activated Carbon Electrode for High-performance Capacitive Deionization
    Sep. Purif. Technol. (IF 5.107) Pub Date : 2020-01-18
    Jiangzhou Xie; Jinxing Ma; Linlin Wu; Min Xu; Wei Ni; Yi-Ming Yan
    更新日期:2020-01-21
  • Preparation of electrolyte for vanadium redox flow battery from sodium-polyvanadate precipitated wastewater
    Sep. Purif. Technol. (IF 5.107) Pub Date : 2020-01-18
    Cong Liu; Tao Liu; Yimin Zhang; Zilin Dai; Yadong Yang

    In order to reduce pollution from wastewater and recycle the valuable metal in the vanadium precipitation process, sodium polyvanadate precipitated wastewater was utilized to prepare an electrolyte for the vanadium redox flow battery after two-stage purification via solvent extraction, which removed most of the impurities, especially Mn. The concentration of impurity ions was less than 10 ppm, as obtained by using inductively coupled plasma-optical emission spectroscopy, and the electrolyte obtained from the wastewater complied with the Chinese national standard. The method applied herein can simplify the preparation process compared to the conventional method and avoid ammonia nitrogen pollution. Electrochemical analysis showed that the properties of the prepared electrolyte were similar to those of the standard electrolyte. From the charge/discharge test, the energy efficiency and coulombic efficiency of the electrolyte reached nearly 90% of those of the standard electrolyte, which indicates that the electrolyte prepared from wastewater has the potential for commercial applications.

    更新日期:2020-01-21
  • 更新日期:2020-01-21
  • Comb-shaped amphiphilic triblock copolymers blend PVDF membranes overcome the permeability-selectivity trade-off for protein separation
    Sep. Purif. Technol. (IF 5.107) Pub Date : 2020-01-18
    Junqiang Zhao; Qiqi Wang; Jing Yang; Yi Li; Zhongyun Liu; Luqing Zhang; Yiping Zhao; Shuxiang Zhang; Li Chen
    更新日期:2020-01-21
  • Recovery of ammonium nitrogen from human urine by an open-loop hollow fiber membrane contactor
    Sep. Purif. Technol. (IF 5.107) Pub Date : 2020-01-17
    Junhui Zhang; Mengfei Xie; Xin Tong; Su Liu; Dan Qu; Shuhu Xiao
    更新日期:2020-01-17
  • Comprehensive experimental study of acid gases removal process by membrane-assisted gas absorption using imidazolium ionic liquids solutions absorbent
    Sep. Purif. Technol. (IF 5.107) Pub Date : 2020-01-17
    Artem A. Atlaskin; Sergey S. Kryuchkov; Nail R. Yanbikov; Kirill A. Smorodin; Anton N. Petukhov; Maxim M. Trubyanov; Vladimir M. Vorotyntsev; Ilya V. Vorotyntsev

    For the first time the comprehensive study of a unique hybrid technique – membrane-assisted gas absorption (MAGA) for the acid gases removal was performed. As a case study, the influences of the presence of imidazolium ionic liquids in the methyldiethanolamine (MDEA) absorbent solutions on process separation efficiency were evaluated on the example of separation of two binary methane-based gases mixtures containing impurities of carbon dioxide or hydrogen sulfide. It was shown, that the addition of small amount (5 vol.%) of ionic liquids provides the significant increase on the process separation efficiency in a comparison with pure MDEA performance, which was taken as a reference. Also, the proposed technique was compared with a conventional single-stage membrane gas separation method and it was shown, that membrane-assisted gas absorption provides much higher separation efficiency in a whole observed range of processes productivity. The achieved purity of target component (methane) using absorbent solutions containing imidazolium ionic liquids exceeds the pure MDEA results more when 6 vol.% and equals to 90.2 vol.% in case of CH4/CO2 separation. In case of hydrogen sulfide removal (the initial content in the mixture is 5 vol.%) using a sorbent containing an ionic liquid, the methane purity is 99.87 vol.%, which exceeds the purity of methane achieved by using pure MDEA by 1.8 vol.%. Moreover, as an important part of process study the dynamics of establishing the steady state under a closed-mode operation was studied and the most efficient operational time regions and ultimate separation performance of a process was observed.

    更新日期:2020-01-17
  • The selective chlorination of nickel and copper from low-grade nickel-copper sulfide-oxide ore: mechanism and kinetics
    Sep. Purif. Technol. (IF 5.107) Pub Date : 2020-01-17
    Fuhui Cui; Wenning Mu; Yuchun Zhai; Xueyi Guo

    On account of the complex occurrence of valuable metals in a large amount of low-grade nickel sulfide ore, obstacles have been caused by using the existing metallurgical method. Therefore, we are reporting a new selective chlorination roasting and water leaching process to treat complex nickel sulfide ore. Anhydrous aluminum chloride was firstly used as the solid chlorination agent to sulfide ore. The chlorination mechanism for metals in nickel-copper sulfide ore were determined by thermodynamic calculation and experiment. The thermodynamic analysis showed that the predominant matter contributing to the chlorination of talc, lizardite, and magnetite were AlCl3 (both solid or gas) and the generated HCl, however, the chlorination of metal sulfide (pentlandite, chalcopyrite, and pyrite) were mostly contributed by the generated Cl2. The effect of roasting temperature, the roasting time, the mass ratio of AlCl3 to the ore, the content of O2 in the roasting atmosphere and the particle size of ore were investigated. The orthogonal experiments results showed that the optimal conditions of the chlorination roasting process were the roasting time of 3 h, the roasting temperature of 450°C, the mass ratio of AlCl3 to ore of 1.5:1, the content of O2 of 20%, and particle size of the ore of 96-80 μm, under this condition, an extraction rate of nickel, copper, iron, and magnesium of 91.6%, 88.5%, 28.4%, and 16.4% was obtained. The chlorination mechanism is that, in the chlorination roasting process, nickel and copper were transferred into their corresponding metal chlorides, while most of the iron and magnesium were transferred into ferric oxide and magnesia-alumina silicates, respectively. TAK (thermal analytic kinetics) were used to clarify the chlorination kinetics, the results showed that the apparent activation energy calculated from DSC data was 70.4 kJ·mol-1, while calculated from TG data was 86.5 kJ·mol-1 (average) by using the FWO method, one of the most probable mechanism function of the chlorination process was G(α)=0.8701[1-(1-α)0.8701](integral form) and f(α)=(1-α)1.8701(differential form). The chlorination selectivity for metals could give guidance to the extraction of metals (especially for valuable metals) either in nickel sulfide ore or other minerals with a complex metal occurrence.

    更新日期:2020-01-17
  • Enhanced Separation of Benzene and Cyclohexane by Homogeneous Extractive Distillation using Ionic Liquids as Entrainers
    Sep. Purif. Technol. (IF 5.107) Pub Date : 2020-01-17
    Miguel Ayuso; Andrés Cañada-Barcala; Marcos Larriba; Pablo Navarro; Noemí Delgado-Mellado; Julián García; Francisco Rodríguez

    The worldwide production of cyclohexane is mainly carried out through the hydrogenation of benzene. Unreacted benzene is separated from produced cyclohexane, being one of the most challenging processes in the petrochemical industry due to their extremely close boiling points and the presence of an azeotrope. In this work, an experimental screening of seven ionic liquids has been done in order to check the suitability of the extractive distillation with ionic liquids. The vapor-liquid or vapor-liquid-liquid equilibria (VLE/VLLE) of {cyclohexane/benzene + ionic liquid} binary systems and {cyclohexane + benzene + ionic liquid} ternary systems have been determined by Headspace-Gas Chromatography technique. The Non-Random Two Liquids (NRTL) thermodynamic model has been used to fit the experimental VLE/VLLE accurately. Although all the selected ionic liquids enhanced the cyclohexane/benzene relative volatility (α1,2) in comparison with conventional solvents, the [4bmpy][TCM] was chosen and implemented in Aspen Plus to simulate the extractive distillation process of benzene from cyclohexane with ionic liquids. The associated operating costs and the energy savings in comparison with conventional process, using N-methyl-2-pyrrolidone (NMP) as solvent, show that the extractive distillation with the [4bmpy][TCM] ionic liquid improves the conventional process, standing as an enhancer technology in the field.

    更新日期:2020-01-17
  • Novel nitrogen-rich g-C3N4 with adjustable energy band by introducing triazole ring for Cefotaxime removal
    Sep. Purif. Technol. (IF 5.107) Pub Date : 2020-01-17
    Boru Gao; Jin Wang; Mengmeng Dou; Xue Huang; Xiaoxia Yu

    Graphitic carbon nitride (g-C3N4) possesses promising photocatalytic abilities due to its graphene-phase framework, distinct electronic structure, and optical performance. Nevertheless, the low visible light absorption capacity, rapid photoexcited electron-hole pairs recombination and transient electron lifetime have limited its extensive applications. In this study, nitrogen-rich triazole ring was introduced into conventional g-C3N4 structure to yield N-rich g-C3N4 (g-C3N4-N). Compared to traditional g-C3N4, the photocatalytic degradation efficiency of g-C3N4-N towards cefotaxime (CFX) was improved by 3-fold. Meanwhile, the mineralization rate rose to 51.3% with respect to 29.2%. The photocatalytic mechanism was then analyzed by various techniques, such as XPS, elemental analysis, FT-IR, and DFT calculations. The data revealed that introduction of triazole ring with mild electrophilicity on LUMO shifted the electron from melem to triazole ring. The change in electron structure shortened the bandgap of the catalyst and produced midgap state, thereby increasing the visible light absorption region of the catalyst. The PL, photocurrent density and EIS analyses suggested that midgap state could temporarily capture electrons and promote the separation of photoexcited electron-holes. In sum, the proposed novel one-step synthetic route of modified g-C3N4 material looks promising for future environmental remediation applications.

    更新日期:2020-01-17
  • Scaling up of defect-free flat membrane with ultra-high gas permeance used for intermediate layer of multi-layer composite membrane and oxygen enrichment
    Sep. Purif. Technol. (IF 5.107) Pub Date : 2020-01-16
    Songlin Dong; Zhi Wang; Menglong Sheng; Zhihua Qiao; Jixiao Wang

    Multi-layer composite membrane has attracted more and more attention in the field of gas separation, especially for CO2 separation, and the intermediate layer (or gutter layer) has a significant influence on the performance of the multi-layer composite membrane. However, due to low gas permeance, current commercial gas separation membranes cannot be used as the intermediate layers with which to fabricate multi-layer composite membranes with high gas permselectivity. Aiming at oxygen enrichment application and developing proper large-area intermediate layer for multi-layer composite membrane, the scaling-up process of the flat membrane with ultra-high permeance was investigated in detail by using the most common material for intermediate layer and a substrate with extremely high gas permeance. In the lab-scale, through simply adjusting the relative humidity and prepolymer concentration, the coating solution with an appropriate cross-linking degree could be successfully prepared in 10 minutes. In view of the low viscosity of the coating solution, a consecutive membrane fabrication machine with the dip-blade coating unit was specifically designed to scale up the membrane. Using a firstly proposed wet-dry combined coating method, the defect-free flat membrane with a width of 1 m was successfully prepared, which had uniform performance in both the transverse and longitudinal directions. The O2 and CO2 permeance of the prepared large-area membrane could reach 2000 and 10000 GPU respectively, which was the highest among the reported membranes prepared with similar materials.

    更新日期:2020-01-17
  • Synthesizing Co3O4-BiVO4/g-C3N4 heterojunction composites for superior photocatalytic redox activity
    Sep. Purif. Technol. (IF 5.107) Pub Date : 2020-01-16
    Yile Wang; Dan Yu; Wei Wang; Pin Gao; Shan Zhong; Lishan Zhang; Qiangqiang Zhao; Baojiang Liu
    更新日期:2020-01-17
  • Chemically tunable DILs: physical properties and highly efficient capture of low-concentration SO2
    Sep. Purif. Technol. (IF 5.107) Pub Date : 2020-01-16
    Dan Li; Yong Kang; Jie Li; Zongchi Wang; Zhinan Yan; Kai Sheng

    As a successive work towards exploring suitable IL-based absorbents for SO2 absorption from flue gas, we developed a species of new dicationic ionic liquids (DILs) with the combination of ether-functionalized dication and N-heterocyclic anions. These dual-functionalized DILs possessed high thermal stability, low vapour pressure, and high SO2 capacity. The solubilities of SO2 in the DILs increased with declining of the temperature and elevating of the SO2 concentration. Notably, the available loading capacity of SO2 in DIL4 was up to 0.267 g SO2·(g DIL)-1 at 313.2 K when the concentration of SO2 in the feed gas was 2000 ppm, which was exceedingly significant for trapping SO2 from the flue gas with low content of SO2. The regeneration experiments demonstrated that the absorption capacities of SO2 in DIL4 kept unchanged after six successive cycles of absorption/desorption. The absorption mechanisms based on the results of 1H NMR, FTIR analysis and quantum chemical calculations indicated that both physical and chemical interactions between the SO2 molecules and DIL4 could be found in spite of different concentrations of SO2.

    更新日期:2020-01-17
  • Permeability dependencies on the carrier concentration and membrane viscosity for Y(III) and Eu(III) transport by using liquid membranes
    Sep. Purif. Technol. (IF 5.107) Pub Date : 2020-01-16
    S. Pavón; A. Fortuny; M.T. Coll; M. Bertau; A.M. Sastre

    The recovery of Y(III) and Eu(III) from fluorescent lamp leachates via supported liquid membranes using Cyanex 923 as a carrier has been studied. The results reveal that the transport process is mainly controlled by the diffusion or the viscosity of the organic phase depending on the carrier concentrations. Furthermore, this paper compares the transport model for flat sheet supported liquid membranes and hollow fibre renewal liquid membranes regarding both REEs in nitrate media. The model allows foreseeing the permeability coefficients for these REEs as a function of the organic phase variables. This study reveals furthermore, that the difference on the permeability coefficients between both membranes correlates to their structural characteristics, e.g. tortuosity, thickness and porosity.

    更新日期:2020-01-17
  • Purification of concentrated nickel sulfuric liquors via synergistic solvent extraction of calcium and magnesium using mixtures of D2EHPA and Cyanex 272
    Sep. Purif. Technol. (IF 5.107) Pub Date : 2020-01-16
    Alexandre Silva Guimarães; Lucas Andrade Silva; Alexandre Moni Pereira; Julio Cesar Guedes Correia; Marcelo Borges Mansur

    A synergistic solvent extraction circuit consisting of D2EHPA and Cyanex 272 was applied to purify a concentrated Ni sulfuric solution ([Ni] = 88 g.L-1, [Mg] = 3.1 g.L-1, [Ca] = 0.5 g.L-1) similar to the MHP industrial liquors that feed the electrowinning step. The temperature was identified as a key parameter to optimize Mg extraction as well as to promote the selective recovery of co-extracted Ni in the extraction stages and make the stripping of Ca feasible using HCl as a stripping agent. Ca was crowded out by Ni from the loaded D2EHPA + Cyanex 272 solution and limited the operating pH range between 2 and 4. Under optimum conditions, 98.0% Ca and 98.4% Mg were simultaneously extracted in two and three theoretical stages by D2EHPA (0.30 M) + Cyanex 272 (0.32 M) mixture (pH 4, A/O ratio = 0.7 and 50°C). Co-extracted Ni was selectively recovered (99.7%) from the loaded D2EHPA + Cyanex 272 using [H2SO4] = 0.063 M in three stages (O/A ratio = 1 and 50°C). Ca and Mg can be completely stripped out from the loaded D2EHPA + Cyanex 272 at 50°C in only 1 ([HCl] = 3 M, O/A ratio = 5) or two theoretical stages ([H2SO4] = 1 M, O/A ratio = 2). The purified liquor containing 80 g.L-1 Ni (99.9% purity) can be directed for the electrowinning step to produce Ni cathodes. Extraction and stripping kinetics are rapid (equilibrium reached within 5 minutes). Thermodynamic analysis was done to support the synergism/antagonism trends observed experimentally.

    更新日期:2020-01-17
  • Two-dimensional Metal-Organic Framework nanobelts for Selective Fe3+ Removal from Aqueous Solution with High Adsorption Capacity
    Sep. Purif. Technol. (IF 5.107) Pub Date : 2020-01-16
    Wen-Wen Fan; Xiao-Lan Liu; Yi Cheng; Yu Qin; Shao-Xiong Yang; Zhi-Xiang Lu; Yan-Xiong Liu; Qiu-E Cao; Li-Yan Zheng
    更新日期:2020-01-17
  • ZnAl2O4/BiPO4 composites as a heterogeneous catalyst for photo-Fenton treatment of textile and pulping wastewater
    Sep. Purif. Technol. (IF 5.107) Pub Date : 2020-01-16
    Qingwen Tian; Miao Ran; Guigan Fang; Laibao Ding; Aixiang Pan; Kuizhong Shen; Yongjun Deng

    ZnAl2O4/BiPO4 heterostructures were successfully obtained via co-precipitation and hydrothermal method. The photocatalytic efficiency of ZnAl2O4/BiPO4 composites were improved and seriously influenced by the loading content of ZnAl2O4 under UV light. Photocatalytic tests showed that the kinetic constant of 1 wt% ZnAl2O4/BiPO4 composites for methylene blue degradation under UV irradiation were 0.959 h-1, which is 2.47 and 18.10 times as large as that of pure ZnAl2O4 and BiPO4, respectively. The enhanced photocatalytic performance of ZnAl2O4/BiPO4 heterojunctions was ascribed to effective separation of photo-generated electron–hole pairs. The photogenerated holes (h+) and •OH were the primary reactive species in the MB degradation over ZnAl2O4/BiPO4 composites. Photo-Fenton-like reaction was initiated with H2O2 addition, which significantly improved the photocatalytic activity of ZnAl2O4/BiPO4. The CODCr and color removals of textile wastewater over ZnAl2O4/BiPO4/H2O2 under UV irradiation were 76.74% and 83.22%, and the CODCr and color removals of eucalyptus chemimechanical pulp wastewater (ECMPW) over ZnAl2O4/BiPO4/H2O2 under UV irradiation were 73.98% and 84.54%, respectively. This work provides a new insight for constructing efficient flexible heterogeneous photocatalysts for wastewater purification.

    更新日期:2020-01-17
  • Dynamic Control Analyses of Eco-efficient Partially Heat-integrated Side-stream Pressure-swing Distillation Processes
    Sep. Purif. Technol. (IF 5.107) Pub Date : 2020-01-16
    Qingjun Zhang; Aiwu Zeng; Youguang Ma; Xigang Yuan; Jun Gao

    Dynamic control behavior analysis for the new partially heat-integrated side-stream pressure-swing distillation arrangement is performed with the demonstrating examples of separating a minimum-boiling ethyl-acetate/ethanol azeotrope and a maximum-boiling ethylenediamine/water azeotrope. The snowball effect is observed in these systems. The contribution of this paper is to develop some novel robust and effective control schemes to eliminate or attenuate this effect for these processes. The stable regulatory control is achieved with the dual-product composition held close to their steady-state design specifications when handling the large step changes in throughput and feed composition. The feature control loops of these novel control schemes are that the flowrate in the azeotropic recycle loop from high-pressure column is, respectively, used to control the level in reflux drum and column base of low-pressure column for the minimum- and maximum-boiling azeotropes.

    更新日期:2020-01-16
  • Preparation of Polydimethylsiloxane-SiO2/PVDF-HFP Mixed Matrix Membrane of Enhanced Wetting Resistance for Membrane Gas Absorption
    Sep. Purif. Technol. (IF 5.107) Pub Date : 2020-01-16
    Moau Jian Toh; Pei Ching Oh; Thiam Leng Chew; Abdul Latif Ahmad

    Membrane gas absorption (MGA) has been widely used to separate CO2 from gas mixture attributed to its high interfacial area. In order to secure high absorption flux, the pores of the membrane need to be non-wetted. Currently, hydrophobic membrane suffers from severe pore wetting over prolonged periods of operation. This has called for the enhancement of membrane hydrophobicity to suppress the tendency of pore wetting. In this work, highly hydrophobic PVDF-HFP membrane was synthesized using solvent additive i.e. polydimethylsiloxane-grafted-silica (PGS) via non-solvent induced phase separation. Results showed that mixed matrix membranes (MMMs) exhibited hierarchical structure composed of polymer spherulites due to delayed phase inversion. The embedment of nanoparticles in membrane matrix also contributed to the reduction of membrane’s surface energy. As a result, MMMs achieved an improvement in wetting resistance with a water contact angle up to 149.87° at 3wt% of PGS nanoparticles. The CO2 absorption test using MEA as liquid absorbent showed that MMMs exhibited an enhancement in gas absorption flux owing to higher hydrophobicity. The CO2 absorption flux of pristine and MMMs was declined about 37% and 22%, respectively during 150 h of operation.

    更新日期:2020-01-16
  • Aluminum Sludge thickening: Novel helical pipes for aggregation by dual flocculation and thickening by filtration applied to water treatment plants
    Sep. Purif. Technol. (IF 5.107) Pub Date : 2020-01-14
    Manoel Maraschin; Keila Fernanda Soares Hedlund Ferrari; Andressa Paolla Hubner da Silva; Elvis Carissimi
    更新日期:2020-01-15
  • Catalytic degradation of methylene blue through activation of bisulfite with CoO nanoparticles
    Sep. Purif. Technol. (IF 5.107) Pub Date : 2020-01-14
    Ruyan Dou; Hao Cheng; Jianfeng Ma; Yong Qin; Yong Kong; Sridhar Komarneni

    A novel catalytic system was developed by activating NaHSO3 with CoO nanoparticles for methylene blue (MB) degradation. The CoO nanoparticles were synthesized by a facile one-pot hydrothermal method followed by calcination. The crystallinity, morphology and elemental valence of the CoO were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and X-ray photoelectron spectroscopy (XPS), respectively. MB degradation rates of 91.5% in one minute and 99.4% in six minutes were obtained using the CoO/NaHSO3 system, which may provide a more cost-effective and efficient way for decomposition of dye pollutants. The well-known classical quenching tests were used to investigate the free radicals involved in MB degradation along with electron paramagnetic resonance (EPR) spectra, the latter further confirmed the types of free radicals. Sulfate and hydroxyl radicals were proposed to be responsible for the excellent dye degradation achieved with the new CoO/NaHSO3 system.

    更新日期:2020-01-15
  • Enantioseparation of 4-Nitrophenylalanine using (S)-SDP-metal complex as chiral extractant
    Sep. Purif. Technol. (IF 5.107) Pub Date : 2020-01-13
    Xiong Liu; Shuhuan Chen; Yu Ma; Wenjie Xiao

    The development of new and efficient chiral extractant is of great concern in the field of chiral extraction. Axial chiral diphosphine, such as (S)-BINAP, has been proved to be effective chiral extractant. However, the stereoselectivity of chiral diphosphine with novel structure has been rarely investigated in chiral extraction. (S)-SDP, a famous spiro diphosphine used in asymmetric synthesis, was firstly employed to separate 4-Nitrophenylalanine enantiomers in this study. The influences of metal precursors, pH, extractant concentration and temperature on extraction were investigated. Separation factor (α), enantiomeric excess (ee) and performance factor (pf) were adopted to evaluate the efficiency of enantioseparation. (S)-SDP-Pd was suitable for separation of 4-Nitrophenylalanine enantiomers with the highest α of 3.32. L-4-Nitrophenylalanine was preferentially recognized by (S)-SDP-Pd in extraction. The extraction process was systematically optimized by response surface method. The optimum extraction condition was pH of 7.1, (S)-SDP-Pd concentration of 2.2 mmol/L and temperature of 14.0°C. At this optimum condition, the maximum pf was 0.08536. In addition, the possible chiral recognition mechanism was discussed.

    更新日期:2020-01-13
  • Gelatin-based mesoporous hybrid materials for Hg2+ ions removal from aqueous solutions
    Sep. Purif. Technol. (IF 5.107) Pub Date : 2020-01-13
    Hem Suman Jamwal; Sunita Ranote; Dharamender Kumar; Ghanshyam S. Chauhan; Monica Bansal

    High toxicity and bioaccumulation are the two major features that make mercury as the most dangerous heavy metal for the living organisms and mandates its removal from the contaminated water bodies. Keeping this in view, a new gelatin-based mesoporous hybrid material, with SiO2 as the inorganic and gelatin as the biopolymeric component, was synthesized via the sol-gel process. The material was characterized by FTIR, SEM, SEM-EDS, TEM and BET studies. The synthesized hybrid material containing Gelatin/SiO2, has high surface area of 675.92 m2g-1. It was evaluated as an adsorbent of Hg2+ ions from their aqueous solutions. Parametric study of the factors affecting adsorption process was carried out to find the optimum adsorption conditions. Different kinetic and isotherms models were applied to the data obtained and adsorption was found to follow pseudo-second order kinetics and Langmuir isotherm model. The highest partition coefficient value of 7.13 mg g-1 µM-1 was obtained at the lowest initial Hg2+ ions concentration (50 ppm) studied alongwith an adsorption capacity of 43.85 mg/g while for the highest initial concentration of 225 ppm the respective values were 0.876 mg g-1 µM-1 and 105.075 mg/g. Cumulative adsorption capacity of the hybrid material from reusability studies in seven cycles was found to be 315.6 mg g.−1

    更新日期:2020-01-13
  • Fabrication and characterization of a novel hydrophobic polystyrene membrane using electroblowing technique for desalination by direct contact membrane distillation
    Sep. Purif. Technol. (IF 5.107) Pub Date : 2020-01-13
    Amirhossein Sadeghzadeh; Saeed Bazgir; Mohammad Mahdi A. Shirazi

    In this work, a new hydrophobic membrane with nanofibrous structure was prepared from polystyrene using the electroblowing technique, for the first time, for desalination experiments. Using this technique, the injection rate for the dope solution increased up to 117 µL/min. This means faster and considerably higher fiber productivity as compared to the typical electrospinning. The membrane was treated via a hot-press post treatment. The new membrane was analyzed for the surface morphology and topography, and was then evaluated for desalination using DCMD process. The results for the new membrane compared to a commercial PTFE membrane with 0.22 µm pore size. Larger mean pore size (0.562 µm) was observed for the new membrane. However, the membrane porosity for the nanofibrous membrane was comparable with the PTFE one (∼75%). The fabricated membrane was thinner and therefore it produced higher permeate flux. Both fabricated and commercial membranes showed ˃99% salt rejections for lower range of feed flow rate (≤0.48 L/m). Most importantly, the new membrane fabricated using a cheap and available polymer via a fast technique for DCMD desalination. The hot-pressed, nanofibrous membrane showed higher surface hydrophobicity (154.52o) than the commercial membrane (124.61o). The superhydrophobic state of the new membrane prevented the liquid encroachment into the membrane pores. This consequently improved not only the permeate flux, but also the average salt rejection. Overall, the new fabricated membrane showed a reasonable desalination performance.

    更新日期:2020-01-13
  • 更新日期:2020-01-13
  • A Thermodynamic Model for Reactive Extraction of Macro Amounts of Zirconium and Hafnium with TBP
    Sep. Purif. Technol. (IF 5.107) Pub Date : 2020-01-13
    M.V.S.R. Ravi Kanth; S. Pushpavanam; Shankar Narasimhan; B. Narasimha Murty

    Pure component thermodynamic models are developed for solvent extraction involving ionic reaction equilibrium for distribution of macro concentrations of zirconium and hafnium between an aqueous phase containing HNO3 and an organic solvent phase containing diluted TBP. The concentration range considered is 10-03 to 100 M. A framework based on chemical speciation calculation is used for the purpose. Experimental procedures adopted to obtain the required solvent extraction data for modeling and validating these models are detailed. Measured equilibrium concentrations of total zirconium, total HNO3, total nitrate in the aqueous phase and total zirconium in the organic phase are used to obtain the thermodynamic parameters such as equilibrium constants and activity coefficient model parameters for zirconium and hafnium extraction systems. The novel framework is useful for computing equilibrium concentrations of all the species present in the respective systems. It is also demonstrated that the pure component models developed for extraction of zirconium and hafnium are effective over a wide range of concentrations. These pure component models can be used to simulate and optimize industrial scale zirconium – hafnium separation process.

    更新日期:2020-01-13
  • A comparative study of RO membrane scale inhibitors in wastewater reclamation: Antiscalants versus pH adjustment
    Sep. Purif. Technol. (IF 5.107) Pub Date : 2020-01-13
    Hye-Jin Lee; Mohamad Amin Halali; Thomas Baker; Siva Sarathy; Charles-François de Lannoy

    Scaling is the most common challenge that reverse osmosis (RO) membranes encounter in potable reuse applications due to the high product recovery. Usage of antiscalants or pH adjustment can suppress scale formation on membranes without sacrificing overall recovery. A series of experiments was conducted to evaluate the effectiveness of two different antiscalants (phosphonate-based and acrylic acid-based) and pH adjustment for the inhibition of scaling on polyamide RO membranes during the separation of microfiltration (MF) treated secondary effluent wastewater. Product recovery was targeted at 50%, increasing the residual concentration of scale forming ions by a factor of 2 in the feed. Substantial scale formation, dominated by calcium carbonate, was observed during the separation of the feed. In the presence of antiscalants, calcium carbonate scaling was successfully abated, while iron based scalants did not significantly decrease. Phosphonate-based antiscalants were found to be more effective in inhibiting calcium carbonate scaling as compared to acrylic acid-based antiscalants. As such, RO membranes treated with phosphonate-based antiscalants demonstrated lower permeate flux decline and less calcium scale deposition on membrane surfaces under the tested conditions. The addition of a strong acid to control scaling is a less expensive alternative to antiscalant addition. pH adjustment using sulfuric acid was effective for the inhibition of calcium carbonate scaling. However, acid addition resulted in corrosion of piping leading to considerable leaching of iron and copper into the feed. The presence of iron and copper adversely increased the scaling potential of the membranes.

    更新日期:2020-01-13
  • Automated multistep column chromatography on ÄKTA pure system using in-line sample dilution
    Sep. Purif. Technol. (IF 5.107) Pub Date : 2020-01-13
    Leonildo Delgado; Bastian Franke; Tuomo Frigård; Shin Isogai
    更新日期:2020-01-13
  • Effects of extracellular polymeric substance fractions on polyacrylamide demand and dewatering performance of digested sludges
    Sep. Purif. Technol. (IF 5.107) Pub Date : 2020-01-13
    Vu Hien Phuong To; Tien Vinh Nguyen; Heriberto Bustamante; Saravanamuthu Vigneswaran

    High polymer demand in sludge conditioning is an intractable aspect of the water industry. This study investigated the effects of extracellular polymeric substances (EPS) fractions on polyacrylamide demand for conditioning and dewatering performance. Specifically, it examined aerobically and anaerobically digested sludges from seven full-scale wastewater treatment plants (WWTPs). Our study successfully quantified the contributions of soluble EPS to polyacrylamide demand during conditioning and explained the role of tightly bound EPS (TB-EPS) in determining the digested sludges’ dewatering performance. Results show that the concentrations of soluble EPS in the sludges varied between 92 – 1148 mg/L. Experimental results also demonstrated that between 25% - 80% of polyacrylamides used for conditioning were wasted in “parasitic” reactions with soluble EPS. The residual cationic polyacrylamide left in solution, after the parasitic reactions, was substantial and varied between 35 – 254 mg/L. Despite this outcome, the zeta potential values of dewatered sludge cakes remained negative, i.e. between -24 – -35 mV. These indicated that the residual soluble cationic polyacrylamides would not have been absorbed on the negatively charged sludge particles. This explained the relatively poor performance of the dewatering stage in the treatment plants studied. Furthermore the results suggested the TB-EPS attached to the sludge particles would be responsible for the poor dewatering. We postulated that the TB-EPS would gelify and immobilize the water surrounding the sludge particles. Our study suggested that new and more effective polymers for conditioning are needed to both: (i) reduce polymer demand; and (ii) improve the dewatering performance.

    更新日期:2020-01-13
  • Enhanced performance and antibacterial properties of amine-functionalized ZIF-8-decorated GO for ultrafiltration membrane
    Sep. Purif. Technol. (IF 5.107) Pub Date : 2020-01-12
    Nazerah Ahmad; Alireza Samavati; Nik Abdul Hadi Md Nordin; Juhana Jaafar; Ahmad Fauzi Ismail; Nik Ahmad Nizam Nik Malek
    更新日期:2020-01-13
  • Influence of the dipleg and dustbin dimensions on performance of gas cyclones: an optimization study
    Sep. Purif. Technol. (IF 5.107) Pub Date : 2020-01-12
    Khairy Elsayed; Farzad Parvaz; Seyyed Hossein Hosseini; Goodarz Ahmadi

    Gas cyclones have numerous industrial applications. Typically, each cyclone has a dustbin to collect the trapped particles and the dimensions of the dustbin affect the cyclone performance. This paper aims to optimize the dustbin geometry via numerical simulations. The surrogate-based optimization approach has been applied in this study. The Latin-hyper cube sampling plan is used to generate thirty test cases. An artificial neural network with radial basis function has been used as a surrogate model trained by the CFD simulations. Here three design parameters (the dipleg length, the dustbin height, and the dustbin diameter) and two performance parameters, namely, the Euler number and the Stokes number are used. The fitted surrogate model shows that the variations of the dustbin geometry have a larger effect on the Stokes number than that on the Euler number. Both single-objective and bi-objective optimization studies are carried out using the artificial neural network. It is shown that the resulting optimum design of the dustbin and the dipleg leads to better performance than the conventional cyclones.

    更新日期:2020-01-13
  • Relating nanofiltration membrane morphology to observed rejection of saccharides
    Sep. Purif. Technol. (IF 5.107) Pub Date : 2020-01-12
    Christian M. Schmidt; Matthias Sprunk; Ronny Löffler; Jörg Hinrichs

    Nanofiltration for the fractionation of uncharged solutes has become more interesting in recent times, due to the goal of valorizing side-streams and by-products of the food industry. Since the membranes suitable for this purpose are mainly utilized for demineralization processes, the specifications given by the manufacturer are insufficient for the prediction of the rejection of uncharged solutes. Nine membranes with a molecular weight cut-off between 150 and 1000 Da were investigated showing differences in their rejection of fructose at a transmembrane pressure difference ΔpTM of 1.0 MPa. These values were correlated with the root-mean-square roughness Sq and apparent pore size dap determined by atomic force microscopy, while the determined contact angle Θ did not influence the rejection. Thereby, a correlation between membrane morphology and rejection behavior was established.

    更新日期:2020-01-13
  • Removal of cadmium in contaminated kaolin by new-style electrokinetic remediation using array electrodes coupled with permeable reactive barrier
    Sep. Purif. Technol. (IF 5.107) Pub Date : 2020-01-11
    Haidong Zhou; Jiahui Xu; Shufeng Lv; Zhiyong Liu; Weidong Liu

    Electrokinetics is an in-situ soil remediation technique by which the flow direction of the pollutants can be controlled and soil with low permeability can be treated. In this study, the remediation of cadmium (Cd) contaminated kaolin by a new-style electrokinetics using array electrodes (AEEK) coupled with permeable reactive barrier (AEEK-PRB) process was investigated and the effects were compared. Zeolite and zero-valent iron (ZVI) were used as the PRB material. The investigation firstly evaluated voltage gradients and soil moisture conditions, which ranged from 1.5-3.0 V/cm and 25%-40%, respectively. The best combination of parameters was a voltage gradient of 2.0 V/cm and a moisture content of 30%. The integration of PRB with AEEK could more effectively remove Cd from kaolin with citric acid as the electrolyte. The average removal rate reached the highest at 93.1%, when the initial Cd2+ concentration was 300 mg/kg. Morphological analysis of Cd before and after remediation showed AEEK-PRB could effectively remove most of the exchangeable Cd fraction and the carbonate fraction, as well as some of the organic matter-bound and Fe-Mn oxide-bound fraction, thus reducing the mobility and toxicity of Cd in soil. Cd-polluted soil remediation of AEEK-PRB was comparable to that of previously conducted electrokinetics.

    更新日期:2020-01-13
  • A high-permeance organic solvent nanofiltration membrane via covalently bonding mesoporous MCM-41 with polyimide
    Sep. Purif. Technol. (IF 5.107) Pub Date : 2020-01-11
    Zhihao Si; Ze Wang; Di Cai; Guozhen Li; Shufeng Li; Peiyong Qin
    更新日期:2020-01-13
  • Opportunities for Coupled Electrochemical and Ion-Exchange Technologies to Remove Recalcitrant Micropollutants in Water
    Sep. Purif. Technol. (IF 5.107) Pub Date : 2020-01-11
    Vitor L. Martins; Mark D. Ogden; Mark R. Jones; Sam A. Trowsdale; Peter J. Hall; Henriette S. Jensen
    更新日期:2020-01-13
  • Theoretical study on centrifugal coupling characteristics of self-rotation and revolution of particles in hydrocyclones
    Sep. Purif. Technol. (IF 5.107) Pub Date : 2020-01-11
    Yuan Huang; Hua-lin Wang; Jinyi Tian; Jianping Li; Pengbo Fu; Fengqin He
    更新日期:2020-01-13
  • 更新日期:2020-01-13
  • 更新日期:2020-01-13
  • Pd nanocatalyst stabilized on amine-modified zeolite: Antibacterial and catalytic activities for environmental pollution remediation in aqueous medium
    Sep. Purif. Technol. (IF 5.107) Pub Date : 2020-01-10
    Mahmoud Nasrollahzadeh; Talat Baran; Nuray Yılmaz Baran; Mohaddeseh Sajjadi; Mohammad Reza Tahsili; Mohammadreza Shokouhimehr
    更新日期:2020-01-11
  • Environmentally friendly kaolin-coated meshes with superhydrophilicity and underwater superoleophobicity for oil/water separation
    Sep. Purif. Technol. (IF 5.107) Pub Date : 2020-01-10
    Yujie Wang; Si Luo; Anwei Chen; Cui Shang; Liang Peng; Jihai Shao; Zhangyang Liu
    更新日期:2020-01-11
  • Direct separation of acetate and furfural from xylose by nanofiltration of birch pretreated liquor: Effect of process conditions and separation mechanism
    Sep. Purif. Technol. (IF 5.107) Pub Date : 2020-01-10
    Jakub Zdarta; Anders Thygesen; Martin S. Holm; Anne S. Meyer; Manuel Pinelo

    Lignocellulosic biomass from wood is a potentially rich source of glucose and xylose, which may be used either directly as monosaccharides or function as monomeric building blocks for a range of bioeconomy processes. In this paper we present a forthright separation of monosaccharides from other compounds present in the liquor after thermal biomass pretreatment. The main focus is on separation of xylose from acetate, formate and furans (hydroxymethyl furfural and furfural) by direct nanofiltration of sulphuric acid-hydrothermally pretreated birch liquor (a process optimized for xylose liberation from the biomass). In the study, the performance of eight commercially available flat-sheet membranes with different molecular weight cut-off was compared at 20 and 40 bars of pressure for efficient separation, focusing mainly on xylose retention. The nanofiltration membranes type TS40 (polypiperazine amide) and NF90 (polyamide) with cut-off of around 200 Da were found to be the most suitable for such direct detoxification of the liquor providing xylose retention over 98% and less than 20% retention of the accompanying thermal carbohydrate degradation compounds. The fouling mechanism during separation of the pretreated birch liquor appeared to be mainly cake-layer fouling on the surface of the membrane. Employment of diananofiltration resulted in particularly high purity (over 90%) and recovery (over 99%) of xylose after three diafiltration rounds. Moreover, the selected membranes exhibited great reusability, as the retention of monosaccharides was almost unaltered after five repeated nanofiltration cycles. The data provide new insight into the factors and mechanisms affecting membrane-separation of complex biomass liquors and are of significance for refining of lignocellulosic biomass.

    更新日期:2020-01-11
  • Experimentally Verified Physical Model of Ferromagnetic Microparticles Separation in Magnetic Gradient Inside a Set of Steel Spheres
    Sep. Purif. Technol. (IF 5.107) Pub Date : 2020-01-10
    R. Dvorsky; M. Lesňák; J. Pištora; P. Mančík; J. Bednář

    In this work, we describe the model of magnetic Fe2O3 submicroparticles separation during transit of their water dispersion through separation pipe based on matrix of closely organized steel spheres. The fundamental idea originates from detailed field analysis of gradient magnetic field in spheres contacts ambient generated by external magnetic field and its influence on flowing submicroparticles. During the model derivation, the fundamental physical principles have been applied to minimise the influence of the phenomenological members. The determined result formula related to the separation model determines exit dispersion particles concentration and equivalent form of device efficiency. In its fundamental shape, this formula is the function of nine independent physical parameters. In the frame of its experimental verification, most of these parameters have been fixed. The experimental data have been correlated with our model prediction, where only the following three independent variables have been implemented: separation tube length, particles size, and external magnetic field intensity. The theory and experiment comparison have shown that the coefficient of determination R2 is over 0.997. At the same time, the described theoretical model specifies the approach for optimal parameters selection to achieve the requested separation efficiency in concrete conditions.

    更新日期:2020-01-11
  • Degradation of sulfamethazine by persulfate activated with nanosized zero-valent copper in combination with ultrasonic irradiation
    Sep. Purif. Technol. (IF 5.107) Pub Date : 2020-01-09
    Tingting Zhang; Yanling Yang; Xing Li; Haikuan Yu; Nan Wang; Hang Li; Peng Du; Yifan Jiang; Xiaoyan Fan; Zhiwei Zhou
    更新日期:2020-01-09
  • Ionic liquid-decorated nanocages for cooperative CO2 transport in mixed matrix membranes
    Sep. Purif. Technol. (IF 5.107) Pub Date : 2020-01-09
    Siyuan Ding; Xueqin Li; Sizuo Ding; Wanglong Zhang; Ruili Guo; Jinli Zhang
    更新日期:2020-01-09
  • The key role of free radicals generated from activation of H2O2, S2O82− and ozone over chromium/cerium co-doped magnetite nanoparticles
    Sep. Purif. Technol. (IF 5.107) Pub Date : 2020-01-09
    Tannaz Sadeghi Rad; Alireza Khataee; Shima Rahim Pouran; Sang Woo Joo
    更新日期:2020-01-09
  • 更新日期:2020-01-09
  • Properties of aqueous amine based protic ionic liquids and its application for CO2 quick capture
    Sep. Purif. Technol. (IF 5.107) Pub Date : 2020-01-08
    Liang Wei; Ruifeng Guo; Yunqing Tang; Jiamin Zhu; Meiyang Liu; Jianqiu Chen; Yun Xu
    更新日期:2020-01-09
  • Comparison of Structured Activated Carbon and Traditional Adsorbents for Purification of H2
    Sep. Purif. Technol. (IF 5.107) Pub Date : 2020-01-08
    Bojun He; Jinglei Liu; Ying Zhang; Shengzhong Zhang; Peng Wang; Hong Xu

    RPSA technology can offer a more compact, cost-effective and energy-efficient solution for H2 recovery when compared to conventional PSA. The adsorption rate of adsorbents has become a key factor affecting the development of RPSA. Activated carbon, widely used as adsorbent for CO2 in H2 purification is in urgent need for further development to suitable for RPSA system. In this study, a structured activated carbon adsorbent was prepared using the dip-coating method, with nickel foam as a framework. The adsorption characteristics of the material for CO2 adsorption at different adsorption pressures, volume flow rates, and lamellar spacing parameters were investigated, and the kinetic behaviour was studied by the breakthrough curve. The results showed that the activated carbon was bonded to the nickel foam skeleton via an organic-inorganic binder with excellent mechanical strength. Structured adsorbents bed has uniform gas flow distribution, the pressure drop is about 1 / 3 - 1 / 7 of particles packed bed, and the breakthrough curve was sharper than particles. It indicated that the mass-transfer resistance in the structured adsorbents is low and has high effective diffusivity for CO2. The adsorption rate constant was calculated using the Yoon-Nelson model, and the correlation between the model calculation data and experimental data was greater than 0.98. Structured activated carbon adsorbent manufactured by dip-coating method, has a higher mass transfer coefficient and a shorter mass transfer zone length. It is a potential alternative adsorbent for RPSA.

    更新日期:2020-01-09
Contents have been reproduced by permission of the publishers.
导出
全部期刊列表>>
2020新春特辑
限时免费阅读临床医学内容
ACS材料视界
科学报告最新纳米科学与技术研究
清华大学化学系段昊泓
自然科研论文编辑服务
中国科学院大学楚甲祥
上海纽约大学William Glover
中国科学院化学研究所
课题组网站
X-MOL
北京大学分子工程苏南研究院
华东师范大学分子机器及功能材料
中山大学化学工程与技术学院
试剂库存
天合科研
down
wechat
bug