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  • Cause and Effects of Hyperskin Features on Carbon Molecular Sieve (CMS) Membranes
    J. Membr. Sci. (IF 6.035) Pub Date : 2018-01-12
    Oishi Sanyal, Stephanie T. Hicks, Nitesh Bhuwania, Samuel Hays, Manjeshwar G. Kamath, Shweta Karwa, Raja Swaidan, William J. Koros

    This article considers a previously overlooked feature in carbon molecular sieve (CMS) membranes that we term a “hyperskin” present at the outermost region of dense CMS selective layers. Such a feature with much lower permeability, but similar selectivity compared to the bulk of the skin, reduces CMS hollow fiber permeance below that predicted from corresponding dense films. Effects of the hyperskin are considered for CMS hollow fibers with low skin thicknesses based on two polyimide precursors – Matrimid® and 6FDA:BPDA-DAM. Although the fundamental formation mechanism for the hyperskin feature suggests its existence on virtually all CMS membranes, its impact on transport properties is shown to differ dramatically, depending on the detailed characteristic properties of the specific CMS membrane. Indeed, for hollow fibers with very low nominal resistance (i.e. View the MathML source Selective layer thickness determined by SEM Intrinsic permeability of thick dense CMS films ), the observed permeance only reaches a small fraction of the predicted permeance. The selectivity between different gas penetrants, however, is not altered by the presence of this hyperskin. While identifying this issue is the major focus of this article, strategies to address this limitation, without compromising the molecular sieving properties of CMS membranes are briefly discussed.

    更新日期:2018-01-12
  • High-throughput computational screening of metal-organic framework membranes for upgrading of natural gas
    J. Membr. Sci. (IF 6.035) Pub Date : 2018-01-12
    Zhiwei Qiao, Qisong Xu, Jianwen Jiang

    We report a computational study to screen 4764 computation-ready experimental metal-organic frameworks (CoRE-MOF) for the membrane separation of a ternary gas mixture (CO2/N2/CH4) at 298 K and 10 bar. Combining Monte Carlo and molecular dynamics simulations, the adsorption, diffusion and permeation of the gas mixture are predicted. The structure-performance relationships are established between the geometrical descriptors of MOFs (pore liming diameter, density, void fraction and volumetric surface area) and the evaluation criteria of membrane performance (permeability and permselectivity). Furthermore, principal component analysis is used to assess the interrelationships among the descriptors, then multiple linear regression is applied to quantitatively determine the respective effects of descriptors on performance. In addition, decision tree modelling is adopted to define a clear effective path for screening. Finally, seven best MOF membranes are identified for single-step separation of both CO2 and N2 from CH4. The microscopic insights and structure-performance relationships from this computational study can facilitate the development of new MOF membranes for the upgrading of natural gas.

    更新日期:2018-01-12
  • Development and Characterization of Polyethersulfone-based Nanofiltration Membrane with Stability to Hydrogen Peroxide
    J. Membr. Sci. (IF 6.035) Pub Date : 2018-01-12
    Misgina Tilahun Tsehaye, Jing Wang, Junyong Zhu, Svetlozar Velizarov, Bart Van der Bruggen

    Polyethersulfone-based nanofiltration membranes have been shown to be appropriate to purify wastewater; however, the presence of powerful oxidants (or disinfecting agents) such as hydrogen peroxide can negatively affect the required membrane physicochemical properties, impair its structural morphology and, ultimately, shorten its lifespan. In this work, to overcome such problems, TiO2 nanoparticles (anatase form, <25 nm) were introduced via blending in order to prepare PES(TiO2) membrane. Pristine and commercial PES nanofiltration (PES 10 and NP030) membranes were used as references. All membranes were immersed in a H2O2 (1 or 5 wt.% H2O2) solution for predefined time periods. The process performance of the membranes in terms of water flux and rejection of target solutes was then studied to evaluate their tolerance to H2O2. In addition, the hydrophilicity, process performance and morphology of the membranes were characterized by measuring water contact angles, by performing filtration experiments, and by SEM, respectively. All membranes were found to be tolerant to 1 wt.% H2O2 for a minimum of 20 days. The referenced membranes showed a significant loss in performance after being immersed in 5 wt.% H2O2. The results demonstrated that the PES(TiO2) composite membranes have a better H2O2 tolerance compared to the reference membranes. The PES(TiO2) membrane was found to have a high water permeability (33.4 L/(m2.h.bar)) and a high solute rejection (94.9% for Direct Red 23). Therefore, this membrane can be considered a promising candidate for possible use in treating industrial wastewater effluents containing H2O2.

    更新日期:2018-01-12
  • A Novel Sulfonated Reverse Osmosis Membrane for Seawater Desalination: Experimental and Molecular Dynamics Studies
    J. Membr. Sci. (IF 6.035) Pub Date : 2018-01-12
    Yujian Yao, Meng Li, Xingzhong Cao, Peng Zhang, Wen Zhang, Junfeng Zheng, Xuan Zhang, Lianjun Wang
    更新日期:2018-01-12
  • Fabrication and Characterization of Polyamide-Fullerenol Thin Film Nanocomposite Hollow Fiber Membranes with Enhanced Antifouling Performance
    J. Membr. Sci. (IF 6.035) Pub Date : 2018-01-12
    Tatiana V. Plisko, Alena S. Liubimova, Alexandr V. Bildyukevich, Anastasia V. Penkova, Maria E. Dmitrenko, Vladimir Y. Mikhailovskii, Galina B. Melnikova, Konstantin N. Semenov, Nelya V. Doroshkevich, Anna I. Kuzminova
    更新日期:2018-01-12
  • Real-scale chlorination of BW30 TFC membranes and their physicochemical characterization
    J. Membr. Sci. (IF 6.035) Pub Date : 2018-01-11
    Rhea Verbeke, Veronica Gomez, Tönjes Koschine, Sam Eyley, Anthony Szymczyk, Marcel Dickmann, Tanja Stimpel-Lindner, Werner Egger, Wim Thielemans, Ivo Vankelecom

    Chlorination remains a big hurdle in membrane technology as the most commonly used membranes for water purification consist of a polyamide top-layer, which is not fully resistant towards chlorine-induced oxidation. In this work, DOW FILMTECTM BW30 membrane elements were systematically chlorinated with NaOCl at pilot-scale under acidic conditions (pH4) at 10 bar for 2.5 h. Variations in membrane performance and their physicochemical properties were determined by ATR-FTIR, XPS, WD-XRF, SEM, AFM and zeta-potential measurements. With increasing bleaching concentration, both membrane roughness and chlorine incorporation via N- and ring-chlorination increased, while surface charge remained quasi unaltered. Both water flux and salt passage decreased proportionally over the whole concentration range. Accordingly, positron annihilation lifetime spectroscopy (PALS) revealed a decrease in the size of the top-layer free-volume elements as chlorine concentration increased, confirming, for the first time in a quantitative manner, the so-called tightening effect. The obtained results also show that thin-film composite (TFC) membranes are altered differently when chlorinated under pressure than via simple immersion, as conventionally performed in literature.

    更新日期:2018-01-11
  • Membrane fouling in vacuum membrane distillation for ionic liquid recycling: Interaction energy analysis with the XDLVO approach
    J. Membr. Sci. (IF 6.035) Pub Date : 2018-01-11
    Huanhuan Wu, Fei Shen, Junfeng Wang, Yinhua Wan

    Membrane fouling, essentially originated from the interactions between foulant and membrane surface, is a big obstacle to use membrane distillation (MD) for ionic liquid recycling from its aqueous solution. By applying the extended Derjaguin-Landau-Verwey-Overbeek (XDLVO) approach and surface element integration method, this study mainly investigated the fouling behavior of three kinds of hydrophobic membranes during the vacuum MD (VMD) separation of 1-butyl-3-methylimidazolium chloride ([Bmim]Cl) solutions. Effects of membrane surface chemical properties (e.g. elemental composition and zeta potential), membrane surface morphology (e.g. roughness), and [Bmim]Cl concentration on the interaction energy between [Bmim]Cl and membrane surface were studied. The results showed that the Lifshitz-van der Waals (LW) and electrostatic interaction (EL) components were positive (repulsion), while the acid-base (AB) interaction component was negative (attraction). Roughening membrane surface significantly decreased the interaction energy barrier, indicating a greater risk of being fouled. Even so, membrane surface chemical properties had more important impact on membrane fouling than surface morphology. Energy barrier would be also reduced when [Bmim]Cl concentration increased, signifying a severer membrane fouling potential in a concentration process. These results were expected to help to understand ILs-fouling mechanism in VMD process and guide the selection and fabrication of promising membrane for ILs recovery.

    更新日期:2018-01-11
  • Fouling behavior of negatively charged PVDF membrane in membrane distillation for removal of antibiotics from wastewater
    J. Membr. Sci. (IF 6.035) Pub Date : 2018-01-10
    Jiaxin Guo, Muhammad Usman Farid, Eui-Jong Lee, Dickson Yuk-Shing Yan, Sanghyun Jeong, Alicia Kyoungjin AN
    更新日期:2018-01-11
  • Stable Cycling of Lithium-Sulfur Battery Enabled by a Reliable Gel Polymer Electrolyte Rich in Ester Groups
    J. Membr. Sci. (IF 6.035) Pub Date : 2018-01-10
    Huiping Du, Shizhen Li, Hongtao Qu, Boyang Lu, Xiaogang Wang, Jingchao Chai, Huanrui Zhang, Jun Ma, Zhonghua Zhang, Guanglei Cui
    更新日期:2018-01-11
  • Preparation of PVDF-CTFE hydrophobic membrane by non-solvent induced phase inversion: Relation between polymorphism and phase inversion
    J. Membr. Sci. (IF 6.035) Pub Date : 2018-01-09
    Libing Zheng, Jun Wang, Dawei Yu, Yong Zhang, Yuansong Wei

    Semi-crystalline polymers poly(vinylidene fluoride) and PVDF-based copolymer were common membrane materials which have found broad application. In an attempt to illuminate the relation between phase inversion and the polymer crystalline polymorphism, the effect of LiCl on PVDF polymorphs, membrane morphology, pore structure, hydrophobicity, thermal property, and permeability were investigated for Poly(vinylidene fluoride-co-chlorotrifluoroethylene) (PVDF-CTFE) membrane prepared by non-solvent induced phase inversion method. Both thermodynamic and kinetic effect were observed, and LiCl was found to favor the crystallization process. The phase inversion route and rate were significantly influenced by LiCl, result in the increase of the content of β-phase, membrane crystallinity, thermo-resistance, overall pore size, and pore interconnectivity when increase LiCl content. The surface pore size and porosity increased firstly when LiCl content was lower than 5%, but significantly decreased with more LiCl. Meanwhile, the pore interconnectivity was highly recommend for membrane evaluation as porosity was found delivering partial information. Membrane M5 presents optimal performance with a permeate flux of 21.85 kg/m2.h and the permeate conductivity was lower than 15 µS/cm at a temperature difference of 30 °C. This work demonstrates the relation between phase inversion and the crystalline structure and illuminate its effect on the final membrane. It provides a novel method for membrane mechanism research and membrane evaluation which can be instructive for PVDF membrane research and application.

    更新日期:2018-01-10
  • Separation of major and minor lipid components using supercritical CO2 coupled with cross-flow reverse osmosis membrane filtration
    J. Membr. Sci. (IF 6.035) Pub Date : 2018-01-09
    Karina Araus, Feral Temelli

    A reverse osmosis polyamide membrane was used to test the feasibility of concentrating triacylglycerol (TAG) and α-tocopherol/β-sitosterol from model mixtures (Oleic Acid (OA)/TAG and OA/α-tocopherol/β-sitosterol, respectively) solubilized in SC-CO2 using cross-flow filtration regime. SG membrane was used for up to 26 h at pressures of 120 and 280 bar and temperature of 40 °C and its performance was measured in terms of CO2 flux and separation factor at a transmembrane pressure of 10 bar. Increasing the pressure to 280 bar resulted in a higher reduction in CO2 flux in comparison to that at 120 bar, which was attributed to fouling. CO2 flux was reestablished after cleaning with pure SC-CO2. Feed pressure of 120 bar showed the best separation factors, where the OA separation factor was higher than 1 and those for TAG and α-tocopherol/β-sitosterol were less than 1. The preferential permeation of OA through the reverse osmosis membranes in comparison to TAG and α-tocopherol/β-sitosterol could be attributed to the higher diffusivity of this smaller molecular weight compound and the effect of plasticization and swelling of the membrane upon exposure to SC-CO2. The cross-flow regime efficiently reduced the extent of fouling and subsequent decline of permeate flux. The findings demonstrate the potential to separate bioactive components present in vegetable oil deodorizer distillate and/or to deacidify vegetable oils using coupled supercritical and membrane technologies.

    更新日期:2018-01-10
  • Direct interfacial polymerization onto thin ceramic hollow fibers
    J. Membr. Sci. (IF 6.035) Pub Date : 2018-01-06
    Evelien Maaskant, Patrick de Wit, Nieck E. Benes
    更新日期:2018-01-07
  • A dual membrane composed of composite polymer membrane and glass fiber membrane for rechargeable lithium-oxygen batteries
    J. Membr. Sci. (IF 6.035) Pub Date : 2018-01-06
    Hyun-Sik Woo, Jae-Hong Kim, Yong-Bok Moon, Won Keun Kim, Kyoung Han Ryu, Dong-Won Kim

    Development of the lithium ion-conducting membrane with high ionic conductivity and good interfacial stability is a major challenge for lithium-oxygen batteries with high energy density. Herein, we design the dual membrane composed of Li+ ion-conducting ceramic-based composite polymer membrane and glass fiber membrane. The optimized membrane exhibited a high ionic conductivity of 8.1ⅹ10−4 S cm−1 at ambient temperature and retained an electrolyte solution well in the membrane. The dual membrane also effectively suppressed the lithium dendrite growth and blocked superoxide anion radical attack toward polymer in the composite polymer membrane. The lithium-oxygen cell employing dual membrane exhibited improved cycle life (> 70 cycles) at a constant current density of 0.1 mA cm−2, which was much better than the cell with either a composite polymer membrane alone or a glass fiber membrane alone.

    更新日期:2018-01-07
  • Biofouling control in reverse osmosis by nitric oxide treatment and its impact on the bacterial community
    J. Membr. Sci. (IF 6.035) Pub Date : 2018-01-05
    Hyun-Suk Oh, Florentin Constancias, Chitrakala Ramasamy, Pei Yi Peggy Tang, Mon Oo Yee, Anthony G. Fane, Diane McDougald, Scott A. Rice
    更新日期:2018-01-05
  • Poly(arylene ether nitrile) anion exchange membranes with dense flexible ionic side chain for fuel cells
    J. Membr. Sci. (IF 6.035) Pub Date : 2018-01-04
    En Ning Hu, Chen Xiao Lin, Fang Hua Liu, Xiu Qin Wang, Qiu Gen Zhang, Ai Mei Zhu, Qing Lin Liu

    To resolve the excessive swelling and undesirable alkaline stability of densely functionalized type anion exchange membranes (AEMs) and to obtain high performance AEMs, quaternary ammonium-functionalized poly(arylene ether nitrile) (QPAEN) AEMs with dense flexible ionic side chain are prepared via nucleophilic substitution polycondensation, demethylation reaction and Williamson reaction. The densely pendent flexible long side chains with QA groups at the end provide a high conductivity and the introduced strong polar nitrile groups result in lower water uptake, excellent dimensional stability and strong alkali resistance of the AEMs. The QPAEN membrane with IEC of 1.78 meq ∙  ∙   g−1 exhibits the highest hydroxide conductivity of 116.0 mS ∙  ∙   cm−1 at 80 °C. The high conductivity is attributed to the well-developed hydrophilic/hydrophobic phase separated morphology that constructs efficient ion conducting pathways in the membranes. High retention of hydroxide conductivity (80.2%) and ionic exchange capacity (IEC) (86.0%) was observed for the QPAEN-0.4 membrane in the degradation test in a 2 M aqueous KOH solution for 480 h. Moreover, the single cell performance of the as-prepared AEMs was greatly enhanced and a high peak power density of 251.3 mW ∙  ∙   cm−2 at 60 °C was observed.

    更新日期:2018-01-05
  • High CO2 tolerance oxygen permeation membranes BaFe0.95-xCa0.05TixO3-δ
    J. Membr. Sci. (IF 6.035) Pub Date : 2018-01-04
    Kui Li, Hailei Zhao, Yao Lu, Yanhui Ma, Zhihong Du, Zijia Zhang
    更新日期:2018-01-04
  • A Robust Thin Film Composite Membrane Incorporating Thermally Rearranged Polymer Support for Organic Solvent Nanofiltration and Pressure Retarded Osmosis
    J. Membr. Sci. (IF 6.035) Pub Date : 2018-01-04
    Ji Hoon Kim, Sun Ju Moon, Sang Hyun Park, Marcus Cook, Andrew G. Livingston, Young Moo Lee

    Thin film composite (TFC) polymer membranes are ubiquitous in membrane-based liquid separation processes, especially in reverse osmosis (RO). While the ultrathin polyamide separating layer employed in TFC membranes has exhibited excellent performance in many liquid separation processes, the polymer support has been identified as a bottleneck to practical applications. In this work, we report a highly porous, thermally and chemically robust support comprising a thermally rearranged polymer which is combined with a polyamide active layer to form a thermally rearranged, thin film composite (TR-TFC) polymer membrane for general use in liquid separation, and for environmentally-friendly power generation. The precursor polymer has good processability for scale-up of synthesis and membrane fabrication. After thermal rearrangement, the developed TR-TFC membranes containing polybenzoxazole-co-imide can be utilized in separations in any organic liquids, including under harsh environments such as dimethyl formamide even at elevated temperatures, with a remarkable performance. Moreover, the membrane achieves 40 W m−2 of power density through pressure retarded osmosis using a concentrated brine, similar to those obtained from RO plants. These results points to the possibilities for next-generation TFC polymer membranes for general use in liquid separation and power generation.

    更新日期:2018-01-04
  • MEMBRANE ELECTRODE ASSEMBLY FOR ENERGY HARVESTING FROM SALINITY GRADIENT by reverse electrodialysis
    J. Membr. Sci. (IF 6.035) Pub Date : 2018-01-04
    Byeongdong Kang, Hyun Jung Kim, Dong–Kwon Kim

    In this study, the potential of the application of membrane electrode assembly (MEA) to energy harvesting from salinity gradient by reverse electrodialysis is experimentally investigated. The MEA, which consists of a cation exchange membrane and two porous silver/silver chloride electrodes, is developed. Power generation from the MEA located between sodium chloride solutions having various differences in concentration is measured. The highest power generation density achieved is 4.1 W m−2, which is greater than those reported in previous studies on conventional reverse electrodialysis cells.

    更新日期:2018-01-04
  • Mussel-inspired Sulfonated Polydopamine Coating on Anion Exchange Membrane for Improving Permselectivity and Anti-fouling Property
    J. Membr. Sci. (IF 6.035) Pub Date : 2018-01-04
    Huimin Ruan, Zhihao Zheng, Jiefeng Pan, Congjie Gao, B. Van der Bruggen, Jiangnan Shen
    更新日期:2018-01-04
  • Atomic layer deposition of metal oxides on carbon nanotube fabrics for robust, hydrophilic ultrafiltration membranes
    J. Membr. Sci. (IF 6.035) Pub Date : 2018-01-03
    Jianhua Feng, Sen Xiong, Zhaogen Wang, Zhaoliang Cui, Shi-Peng Sun, Yong Wang

    Carbon nanotubes (CNTs) are important building blocks to produce high-performance membranes. However, the strong hydrophobicity significantly hinders their applications in aqueous systems. Herein, we demonstrate, for the first time, that atomic layer deposition (ALD) is an efficient and flexible method to upgrade the permselectivity of CNT-based membranes. We ALD-deposit ZnO on fabrics of multi-walled carbon nanotubes. ZnO grows on the CNT surface as nanoparticulates initially and then forms conformal layers wrapping the CNTs. The originally hydrophobic surface of CNTs is progressively turned to be highly hydrophilic with rising ALD cycles. The deposition of ZnO on CNTs significantly promotes the surface wettability of the CNT membranes on one hand, and endows the membrane an enhanced mechanical stability on the other. The CNT membranes exhibit simultaneously upgraded water permeability and retention in the ultrafiltration category after ALD for moderate cycle numbers. With ever increased ALD cycles, the retention is further improved while the water permeability is decreased due to the competing effect of the increased hydrophilicity and narrowed pores. The strategy of “ALD on CNT substrates” is expected to produce other robust membranes with additional functionalities dependent on the materials to be deposited by ALD.

    更新日期:2018-01-04
  • Support mass transfer resistance of Pd/ceramic composite membranes in the presence of sweep gas
    J. Membr. Sci. (IF 6.035) Pub Date : 2018-01-03
    Chenyang Zhao, Alessio Caravella, Hengyong Xu, Adele Brunetti, Giuseppe Barbieri, Andreas Goldbach
    更新日期:2018-01-04
  • Experimental and theoretical study of nanofiltration of weak electrolytes: SO42–/HSO4–/H+ system
    J. Membr. Sci. (IF 6.035) Pub Date : 2018-01-03
    Julio López, Mònica Reig, Andriy Yaroshchuk, Edxon Licon, Oriol Gibert, José Luis Cortina

    Over recent years, nanofiltration (NF) has been considered as an effective way to improve processing steps in metallurgical and hydrometallurgy applications dealing with mixtures of metal ions in sulphuric-acid-dominated solutions. The principal advantage of NF membranes over reverse osmosis (RO) membranes is their ability to allow for a practically free passage of acid, while metallic species, especially multi-charged species, are efficiently rejected. In general, these sulphuric solutions cover a range from strongly acidic solutions with pH below 1 up to moderately acidic solutions of pH 3. Over this range, changes in the feed acidity influence both the aqueous electrolyte solution speciation ( View the MathML source S O 4 2 − / HS O 4 − / H + ) and the membrane acid–base properties (protonation of carboxylic and amine groups). However, few studies have been published on the trans-membrane transport of inorganic species coupled to changes in their speciation as well as to the properties of the membrane phase. In this study, experimental data on the sulphuric acid rejection for pH values from 1 to 3 have been obtained with an aromatic poly(piperazine)amide membrane (NF270) at various trans-membrane pressures. The results were modelled by a novel version of the Solution-Electro-Diffusion model taking into account equilibrium reactions, and a general (quasi)analytical solution was obtained for the transport of weak electrolytes of arbitrary valence type. The equilibrium weak acid reaction made the total sulphate (SO42-/HSO4-) rejection decrease strongly as the fraction of single-charged hydrogen sulphate (HSO4-) in the feed increased. From the modelling procedure, permeances to H+, HSO4- and SO42- over the studied pH range were determined.

    更新日期:2018-01-04
  • Zwitterionic polymer modification of polyamide reverse-osmosis membranes via surface amination and atom transfer radical polymerization for anti-biofouling
    J. Membr. Sci. (IF 6.035) Pub Date : 2018-01-03
    Zhe Yang, Daisuke Saeki, Hideto Matsuyama

    Surface-initiated atom transfer radical polymerization (SI-ATRP) is a powerful method to uniformly modify the surface of reverse-osmosis (RO) membranes with functional polymers and prevent biofouling. However, immobilization of the initiator, an essential step of SI-ATRP, is difficult to perform directly on commercial polyamide RO membranes. This study describes an effective pretreatment method to immobilize ATRP initiators on the surface of polyamide RO membranes and the effect of the polymer chain length on the biofouling behavior. Firstly, RO membrane surfaces were aminated with 3-aminopropyltrimethoxysilane (APTES). Then, α-bromoisobutyryl bromide (BIBB), an acyl halide-type ATRP initiator, was reacted with the APTES layer. A zwitterionic polymer, poly[(2-methacryloyloxy)ethyl]dimethyl[3-sulfopropyl]ammonium hydroxide (pMEDSAH), was then grafted on the membrane surface via SI-ATRP. The APTES treatment effectively improved the amount of BIBB immobilized on the membrane surface, maintaining the water permeability and salt rejection properties of the RO membrane. pMEDSAH grafting enhanced the surface hydrophilicity and changed the surface to a smoother and denser morphology. Regarding the biofouling behavior, static bacterial adhesion on the membrane surface was prevented by increasing the ATRP polymerization time. In cross-flow bacterial filtration tests, the membranes grafted with pMEDSAH at polymerization times of over 1 h presented no permeability decline and little biofilm coverage.

    更新日期:2018-01-03
  • Reinvestigation of Membrane Cleaning Mechanisms using NaOCl: Role of Reagent Diffusion
    J. Membr. Sci. (IF 6.035) Pub Date : 2018-01-03
    Xueye Wang, Jinxing Ma, Zhiwei Wang, Haiqin Chen, Mingxian Liu, Zhichao Wu
    更新日期:2018-01-03
  • 更新日期:2018-01-01
  • 更新日期:2017-12-31
  • Novel Inorganic Membrane for the Percrystallization of Mineral, Food and Pharmaceutical Compounds
    J. Membr. Sci. (IF 6.035) Pub Date : 2017-12-30
    Julius Motuzas, Christelle Yacou, Rasmus S.K. Madsen, Weng Fu, David K. Wang, Anne Julbe, James Vaughan, João C. Diniz da Costa
    更新日期:2017-12-31
  • 更新日期:2017-12-31
  • Monitoring Multicomponent Transport using In Situ ATR FTIR Spectroscopy
    J. Membr. Sci. (IF 6.035) Pub Date : 2017-12-30
    Bryan S. Beckingham, Nathaniel A. Lynd, Daniel J. Miller
    更新日期:2017-12-31
  • Fundamental effects of Ag alloying on hydrogen behaviors in PdCu
    J. Membr. Sci. (IF 6.035) Pub Date : 2017-12-30
    L.C. Liu, J.W. Wang, J. Qian, Y.H. He, H.R. Gong, C.P. Liang, S.F. Zhou

    First principles calculations are performed to comparatively reveal the fundamental effects of Ag alloying on phase stability, hydrogen solubility, hydrogen diffusivity, and hydrogen permeability of body-centered-cubic (BCC) and face-centered-cubic (FCC) Pd8Cu8 phases. It is found that the addition of Ag would slightly decrease phase stability of Pd8Cu8, and the BCC structure of Pd8Cu7Ag and Pd7Cu8Ag is energetically more stable than its FCC counterpart at 0 K. Calculations also reveal that crystal structure (BCC or FCC) of PdCuAg and substituting position (Pd or Cu) of Ag should play dominant roles in determining the relative magnitude of hydrogen solubility, hydrogen diffusivity, and hydrogen permeability between PdCuAg and PdCu phases. The present results agree well with experimental observations in the literature, and provide a deep understanding of the fundamental effects of Ag on hydrogen behaviors in PdCu phases.

    更新日期:2017-12-31
  • Facile sol-gel coating process for anti-biofouling modification of poly (vinylidene fluoride) microfiltration membrane based on novel zwitterionic organosilica
    J. Membr. Sci. (IF 6.035) Pub Date : 2017-12-29
    Weilong Song, Zhipeng Li, Yizhu Li, Hong You, Peishi Qi, Feng Liu, Douglas A. Loy
    更新日期:2017-12-31
  • Controlled design of zwitterionic bi-continuous VIPS membranes from the PVDF/PMBU blend for biofouling mitigation in complex medium
    J. Membr. Sci. (IF 6.035) Pub Date : 2017-12-29
    Antoine Venault, Chen-Hua Hsu, Kazuhiko Ishihara, Yung Chang
    更新日期:2017-12-31
  • Integral hollow fiber membrane with chemical cross-linking for pressure retarded osmosis operated in the orientation of active layer facing feed solution
    J. Membr. Sci. (IF 6.035) Pub Date : 2017-12-29
    Ye Li, Shanshan Zhao, Laurentia Setiawan, Lizhi Zhang, Rong Wang

    Pressure retarded osmosis (PRO) is an innovative technique to yield osmotic energy. Nevertheless, the PRO performance is exacerbated by the severe membrane fouling occurring within the porous support. It is a potential alternative for sustainable power harvesting to change the membrane orientation from active layer facing draw solution (AL−DS) or PRO mode to active layer facing feed solution (AL−FS) or FO mode for a low-fouling propensity. A novel integral PRO hollow fiber membrane was developed in this work by phase inversion and followed with a facile cross-linking post-treatment. The structure and properties of the resultant membrane were systematically investigated using a series of characterization protocols. The PRO performance of the membrane was studied under various hydraulic pressures at the AL−FS orientation. The results reveal that the substrate with sponge-like structure and relatively dense inner surface can better withstand high pressure in PRO process. Two steps of cross-linking endowed the membrane with a smaller pore size on the outer surface that exhibits high rejection against various inorganic salts. The novel integral membrane can achieve a stable power density output around 4.3 W·m-2 at 12 ~ 13 bar hydraulic pressure, using a real wastewater reverse osmosis (RO) retentate and 1.0 M sodium chloride as the feed and draw stream, correspondingly. This result demonstrates that the PRO operation in the AL−FS orientation (FO mode) offers a significant advantage over the AL−DS orientation (PRO mode) by eliminating the pretreatment of the feed water or/and other measures associated with membrane fouling control in the PRO mode. To implement the PRO operation with the AL−FS orientation, developing a robust membrane with an integral structure is critical. The newly developed integral hollow fiber membrane via chemical cross-linking presents the potential for PRO operation in the AL−FS orientation.

    更新日期:2017-12-31
  • Polymeric Antimicrobial Membranes Enabled by Nanomaterials for Water Treatment
    J. Membr. Sci. (IF 6.035) Pub Date : 2017-12-28
    Junyong Zhu, Jingwei Hou, Yatao Zhang, Miaomiao Tian, Tao He, Jindun Liu, Vicki Chen
    更新日期:2017-12-31
  • Optimizing stretching conditions in fabrication of PTFE hollow fiber membrane for performance improvement in membrane distillation
    J. Membr. Sci. (IF 6.035) Pub Date : 2017-12-28
    Kuiling Li, Yong Zhang, Lili Xu, Fanfu Zeng, Deyin Hou, Jun Wang
    更新日期:2017-12-31
  • 更新日期:2017-12-27
  • Mitigation of the effects of multivalent ion transport in reverse electrodialysis
    J. Membr. Sci. (IF 6.035) Pub Date : 2017-12-26
    J. Moreno, V. Díez, M. Saakes, K. Nijmeijer
    更新日期:2017-12-27
  • Coupled GCMC and LBM simulation method for visualizations of CO2/CH4 gas separation through Cu-BTC membranes
    J. Membr. Sci. (IF 6.035) Pub Date : 2017-12-25
    H. Wang, Z.G Qu, L. Zhou

    A fully dynamic model for mixture gas separation is built in Cu-BTC membranes. A multi-scale method that couples the lattice Boltzmann method with grand canonical Monte Carlo (GCMC) is proposed to investigate the mass transfer process of CO2/CH4 mixture gases in Cu-BTC membranes. The convection and diffusion in the interparticle flow field and the intraparticle diffusion and adsorption in the particle interior are simultaneously considered. The membrane morphology is reconstructed by a sphere-based simulated annealing method. The effects of membrane porosity and particle size on the mass transfer and selectivity of CO2/CH4 mixture gases are predicted. Results show that the selectivity of CO2/CH4 is mainly determined by interparticle and intraparticle mass transfer resistances. Meanwhile, the time of saturation adsorption for CO2 and CH4 both decrease with an increase in porosity but decreases for CO2 and increases for CH4 with an increase in particle size. The selectivity of CO2/CH4 in Cu-BTC membranes decreases with an increase in porosity and particle size. Therefore, membranes with small porosity and particle size should be utilized. Compared with the traditional binary GCMC and ISAT methods based on saturation adsorption, the proposed coupled method is closer to the physical essence of the process because it considers dynamic competitive adsorption. The present method can be helpful in the design of efficient metal−organic framework (MOF) membranes.

    更新日期:2017-12-27
  • 更新日期:2017-12-27
  • Gas separation in polyimide membranes with molecular sieve-like chemical/physical dual crosslink elements onto the top of surface
    J. Membr. Sci. (IF 6.035) Pub Date : 2017-12-25
    Ryosui Iwasa, Takahiro Suidu, Haruka Yamaji, Tetsuro Yoshioka, Kazukiyo Nagai
    更新日期:2017-12-27
  • Anion exchange membranes with clusters of alkyl ammonium group for mitigating water swelling but not ionic conductivity
    J. Membr. Sci. (IF 6.035) Pub Date : 2017-12-25
    Md. Masem Hossain, Jianqiu Hou, Liang Wu, Qianqian Ge, Xian Liang, Abhishek N. Mondal, Tongwen Xu
    更新日期:2017-12-27
  • 更新日期:2017-12-27
  • Porous Nanofibrous Composite Membrane for Unparalleled Proton Conduction
    J. Membr. Sci. (IF 6.035) Pub Date : 2017-12-24
    Chunli Hou, Xiang Zhang, Yifan Li, Guoli Zhou, Jingtao Wang

    Nanostructured porous nanofiber membranes hold a great promise for ultrafast transport of ion and molecule but it remains a technologic challenge to fabricate them with stable nanochannels. We report the use of a new soft template of ionic liquid which has excellent fluidity and molecular-level size to produce porous nanofibers comprising interconnected ~4 nm pores/channels. In addition, the topology of the nanopores/channels can be facilely tailored by the types and loading amount of ionic liquids. After incorporating polymer matrix, an unique type of porous nanofibrous composite membranes (PNFCMs) was fabricated accordingly. In the PNFCMs, the nanochannels can well function as transfer shortcuts and uptake abundant water/moisture while releasing conducting groups, eventually permitting unparalleled proton conduction. The conductivity of PNFCM can be as high as 1.03 S cm−1 in hydrated condition and 0.22 S cm−1 in anhydrous condition, which is around 10 times higher than that of the state-of-the-art Nafion. As a further demonstration, the PNFCMs is used for hydrogen fuel cells, exhibiting excellent performance in anhydrous condition, making it great potential for practical application. This soft template approach is also expected to be used for fabrication of other nanostructured porous nanofiber membranes with well-defined porosity and nanostructures.

    更新日期:2017-12-27
  • Graphene oxide – molybdenum disulfide hybrid membranes for hydrogen separation
    J. Membr. Sci. (IF 6.035) Pub Date : 2017-12-24
    Mayur Ostwal, Digambar B. Shinde, Xinbo Wang, Ikhlas Gadwal, Zhiping Lai

    Graphene oxide – molybdenum disulfide hybrid membranes were prepared using vacuum filtration technique. The thickness and the MoS2 content in the membranes were varied and their H2 permeance and H2/CO2 selectivity are reported. A 60 nm hybrid membrane containing ~75% by weight of MoS2 exhibited the highest H2 permeance of 804×10−9 mol/m2·s·Pa with corresponding H2/CO2 selectivity of 26.7; while a 150 nm hybrid membrane with ~29% MoS2 showed the highest H2/CO2 selectivity of 44.2 with corresponding H2 permeance of 287×10−9 mol/m2·s·Pa. The hybrid membranes exhibited much higher H2 permeance compared to graphene oxide membranes and higher selectivity compared to MoS2 membranes, which fully demonstrated the synergistic effect of both nanomaterials. The membranes also displayed excellent operational long-term stability.

    更新日期:2017-12-27
  • The Unidirectional Regulatory Role of Coagulation Bath Temperature on Cross-section Radius of the PVDF Hollow-Fiber Membrane
    J. Membr. Sci. (IF 6.035) Pub Date : 2017-12-22
    Hao Zhang, Xiaolong Lu, Zhiyu Liu, Zhong Ma, Song Wu, Zhendong Li, Xiao Kong, Juanjuan Liu, Chunrui Wu

    In this paper, the low-temperature thermally induced phase separation (L-TIPS) method was adopted to prepare a high-performance polyvinylidene fluoride (PVDF) hydrophobic membrane for membrane distillation (MD) with non-solvent polyethylene glycol-400 (PEG400) and solvent triethyl phosphate as a fully water-soluble mixed diluent. In the process of L-TIPS membrane formation, the unidirectional regulatory role of coagulation bath temperature on cross-section radius of the PVDF hollow-fiber membrane was analyzed. The results show that the tensile strength of the membrane increases with the increase of the external coagulation bath water temperature, which is the opposite of the general rule. PEG400 is employed to regulate the membrane structure, and more specifically to increase the cellular structure (a positive impact on tensile strength) and reduce the sphere-packed aggregation structure (a negative impact on tensile strength). When the coagulation bath temperature is 60°C, the tensile strength of the membrane reaches 6.21 MPa (more than 2–4 times higher than the hydrophobic membranes reported). Meanwhile, the PVDF hollow-fiber hydrophobic membrane also has a high flux, the vacuum membrane distillation flux reaches 30.6 kg m−2 h−1, which is 14.6 times higher than that at the coagulation bath temperature of 15°C.

    更新日期:2017-12-22
  • 更新日期:2017-12-22
  • Synthesis and Characterization of Hydrogen Selective Silica Membrane Prepared by Chemical Vapor Deposition of Vinyltriethoxysilane
    J. Membr. Sci. (IF 6.035) Pub Date : 2017-12-21
    So-Jin Ahn, Gwang-Nam Yun, Atsushi Takagaki, Ryuji Kikuchi, S. Ted Oyama
    更新日期:2017-12-22
  • Concentration-Dependent Transport in Finite Sized Composites: Modified Effective Medium Theory
    J. Membr. Sci. (IF 6.035) Pub Date : 2017-12-21
    Gloria M. Monsalve-Bravo, Suresh K. Bhatia
    更新日期:2017-12-22
  • 更新日期:2017-12-22
  • Approaching Complete CO Conversion and Total H2 Recovery for Water Gas Shift Reaction in a High-Temperature and High-Pressure Zeolite Membrane Reactor
    J. Membr. Sci. (IF 6.035) Pub Date : 2017-12-20
    Antonios Arvanitis, Xinhui Sun, Shaowei Yang, Devaiah Damma, Peter Smirniotis, Junhang Dong
    更新日期:2017-12-21
  • Mixed matrix membranes of polyurethane with nickel oxide nanoparticles for CO2 gas separation
    J. Membr. Sci. (IF 6.035) Pub Date : 2017-12-20
    Banafsheh Molki, Wrya Mohammadi Aframehr, Rouhollah Bagheri, Javad Salimi
    更新日期:2017-12-21
  • Dynamic changes of the fouling layer in forward osmosis based membrane processes for municipal wastewater treatment
    J. Membr. Sci. (IF 6.035) Pub Date : 2017-12-20
    Yan Sun, Jiayu Tian, Liming Song, Shanshan Gao, Wenxin Shi, Fuyi Cui

    In this work, the dynamic changes in the composition of fouling layer as a function of operating time were systematically investigated and compared in forward osmosis (FO) based membrane processes for municipal wastewater treatment. Fouled membranes were collected from four different operational cycles (3, 8, 16 and 30 days) and prepared for quantitative analyses of organic and inorganic foulants and microscopic observation by confocal laser scanning microscopy (CLSM). Moreover, the dynamic changes of bacterial concentration and community structure were characterized by the plate count method and Illumina MiSeq sequencing, respectively. The results showed that with the extension of operation time, the amount of organic foulants, inorganic species and bacteria deposited on the membrane surface exhibited a gradual increase trend in direct FO, resulting in a corresponding increase of fouling resistance and decline of water flux. As for OMBR, apart from the organic foulants such as polysaccharides and proteins, both the inorganic species and membrane surface bacterial concentration reached to a plateau phase after 8 days of operation, leading to a much lower fouling resistance and flux reduction. The bacterial community analysis indicated that two dominant genus were detected in the biofilm of OMBR; however, the bacterial community on the membrane surface of direct FO exhibited a significantly higher diversity but with a lower abundance.

    更新日期:2017-12-21
  • Biocatalytic Membranes Prepared by Inkjet Printing Functionalized Yeast Cells onto Microfiltration Substrates
    J. Membr. Sci. (IF 6.035) Pub Date : 2017-12-20
    Yingying Chen, Peng Gao, Mark J. Summe, William A. Phillip, Na Wei
    更新日期:2017-12-21
  • 更新日期:2017-12-21
  • Graphene-based membranes with uniform 2D nanochannels for precise sieving of mono-/multi-valent metal ions
    J. Membr. Sci. (IF 6.035) Pub Date : 2017-12-20
    Yue-Heng Xi, Zhuang Liu, Junyi Ji, Yuan Wang, Yousef Faraj, Yudan Zhu, Rui Xie, Xiao-Jie Ju, Wei Wang, Xiaohua Lu, Liang-Yin Chu
    更新日期:2017-12-20
  • Triple antifouling strategies for reverse osmosis membrane biofouling control
    J. Membr. Sci. (IF 6.035) Pub Date : 2017-12-20
    Yao Wang, Zhi Wang, Jixiao Wang, Shichang Wang
    更新日期:2017-12-20
  • Mixed-charge poly(2,6-dimethyl-phenylene oxide)anion exchange membrane for diffusion dialysis in acid recovery
    J. Membr. Sci. (IF 6.035) Pub Date : 2017-12-19
    Liang Wang, Fan Zhang, Zhenxing Li, Jiayou Liao, Yingda Huang, Yinlin Lei, Nanwen Li

    In order to achieve high H+ dialysis coefficients and highly selective of anion exchange membranes (AEMs) for diffusion dialysis (DD) in acid recovery applications, a series of mixed-charge PPO AEMs with quaternary ammonium(QA) and carboxylic acid groups were synthesized quantitatively via Cu(I)-catalysed “click chemistry”. In diffusion dialysis, using an acidic solution (HCl, 1 mol/L; FeCl2, 0.2 mol/L) as a simulated waste solution indicated that the as-obtained mixed-charge PPO AEMs displayed higher H+ dialysis coefficients and a higher H+/Fe2+ selectivity over that of typical AEMs despite their increased water uptake and lower volumetric IECv values. The highest H+ dialysis coefficients, 20.37 m/h, and H+/Fe2+ selectivity 34.52, membranes were achieved with PPO-X35Y20 at 30℃. These values were much higher than that of the PPO-X40 membrane without carboxylic acid groups. Importantly, unlike previously reported AEMs for DD in which the H+/Fe2+ selectivity decreased as the IECw increased, (i.e., a trade-off effect between the UH+ and selectivity), the high IECw of the mixed-charge PPO AEMs tended to result in not only high H+ dialysis coefficients but also high H+/Fe2+ selectivities. It is assumed that the carboxylic acid groups in AEMs likely enhance the dialysis of H+ by the ion changing and hydrogen-bonding more with H+ than Fe2+, thus, cancelling out the ‘trade-off’ effect in DD for acid recovery.

    更新日期:2017-12-19
  • Development of a novel carbon-based conductive membrane with in-situ formed MnO2 catalyst for wastewater treatment in bio-electrochemical system (BES)
    J. Membr. Sci. (IF 6.035) Pub Date : 2017-12-19
    Changfei Gao, Lifen Liu, Tingting Yu, Fenglin Yang

    A new carbon-based RGO/PVDF/MnO2 conductive membrane was developed to treat high load wastewater and recovery energy through bio-electrochemical system (BES), combining Membrane bioreactor (MBR) and Microbial fuel cell (MFC). The conductive membrane dual functions as the cathode of MFC and the filtration medium of MBR simultaneously. The structures of the conductive membrane were investigated by SEM, EDX and XPS, the existence of manganese dioxide catalyst, the high porosity and smooth surface morphology were confirmed. During operation, the membrane always maintained distinct ORR and electrochemical activity, exhibited excellent anti-fouling and flux recovery property, also better COD removal property than the control membrane without MnO2. Replacing proton exchange membrane (PEM) using Quartz sand chamber (QSC), the BES power density was 228 mW/m3 higher than using PEM. The internal resistance, calculated in accordance with the power density curve using QSC was lower than that of the control group (respectively 752 Ω and 937 Ω). The results confirmed that it was feasible to replace the expensive PEM with cheap materials. The novel carbon-based conductive membrane with in-situ formed MnO2 catalyst and constructed BES with QSC were promising and beneficial for the future scale-up of BES.

    更新日期:2017-12-19
  • 更新日期:2017-12-19
  • Structure Dependence of Water Vapor Permeation in Polymer Nanocomposite Membranes Investigated by Positron Annihilation Lifetime Spectroscopy
    J. Membr. Sci. (IF 6.035) Pub Date : 2017-12-19
    Jiajun Fan, Wei Zhou, Qing Wang, Zhaojie Chu, Lanqiong Yang, Lei Yang, Jian Sun, Ling Zhao, Jianmei Xu, Yujun Liang, Zhiquan Chen
    更新日期:2017-12-19
Some contents have been Reproduced with permission of the American Chemical Society.
Some contents have been Reproduced by permission of The Royal Society of Chemistry.
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