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  • Selective Extraction of Vanadium(V) from Sulfate Solutions into a Polymer Inclusion Membrane Composed of Poly(vinylidenefluoride-co-hexafluoropropylene) and Cyphos® IL 101
    J. Membr. Sci. (IF 6.035) Pub Date : 2017-09-19
    Mohammad Reza Yaftian, M. Inês G.S. Almeida, Robert W. Cattrall, Spas D. Kolev

    A poly(vinylidenefluoride-co-hexafluoropropylene) (PVDF-HFP)-based PIM containing trihexyltetradecylphosphonium chloride (Cyphos® IL 101) as its carrier was developed for the selective extraction of V(V) from sulfate solutions. Various plasticizers/modifiers were tested and best results in terms of rate of extraction and amount extracted were obtained with 2-nitrophenyloctyl ether (NPOE). The optimal PIM composition, with respect to the same criteria was determined to be 35 wt% Cyphos® IL 101, 55 wt% PVDF-HFP and 10 wt% NPOE. Back-extraction of V(V) was achieved using 6 mol L−1 H2SO4. An anion exchange mechanism is proposed for the extraction of V(V) involving the formation of the complex anion VO2SO4-. The selectivity of the PIM towards V(V) was tested in the presence of Mo(VI), Al(III), Co(II), Cu(II), Fe(III), Mn(II), and Ni(II). Only Mo(VI) was co-extracted with V(V) at pH 2.3. The Mo(VI) interference was eliminated by a two-step separation procedure in which Mo(VI) was extracted at pH 1.1 which was followed by the selective extraction of V(V) at pH 2.3. The PIM was found to be stable over five extraction/back-extraction cycles.

    更新日期:2017-09-20
  • Water desalination and biofuel dehydration through a thin membrane of polymer of intrinsic microporosity: atomistic simulation study
    J. Membr. Sci. (IF 6.035) Pub Date : 2017-09-19
    Qi Shi, Kang Zhang, Ruifeng Lu, Jianwen Jiang
    更新日期:2017-09-19
  • Bimetallic metal-organic frameworks nanocages as multi-functional fillers for water-selective membranes
    J. Membr. Sci. (IF 6.035) Pub Date : 2017-09-18
    Xuanxuan Cheng, Zhongyi Jiang, Xiaopo Cheng, Song Guo, Lei Tang, Hao Yang, Hong Wu, Fusheng Pan, Peng Zhang, Xingzhong Cao, Baoyi Wang
    更新日期:2017-09-19
  • Electrochemically Active Polymeric Hollow Fibers based on Poly(ether-b-amide)/Carbon Nanotubes
    J. Membr. Sci. (IF 6.035) Pub Date : 2017-09-17
    Carolina Cuevas, Dooli Kim, Krishna P. Katuri, Pascal Saikaly, Suzana P. Nunes
    更新日期:2017-09-19
  • Optimal control of physical backwash strategy - towards the enhancement of membrane filtration process performance
    J. Membr. Sci. (IF 6.035) Pub Date : 2017-09-17
    Nesrine Kalboussi, Jérôme Harmand, Alain Rapaport, Térence Bayen, Fatma Ellouze, Nihel Ben Amar

    In this work, we show how optimal control theory can be used to optimize membrane filtration processes. The objective is to determine the optimal switching between filtration and backwash sequences in order to maximize the net water production per membrane area of microfiltration or ultrafiltration systems over a given period of time. The optimal solutions, whether the backwash flux is constant or variable, have been derived for a membrane filtration process operating at constant transmembrane pressure using a class of filtration models defined only by their qualitative behaviors. The optimal solution is applied in a simulation case study by considering a specific model validated on data recovered from the literature. The robustness of the approach has been evaluated for different disturbances.

    更新日期:2017-09-19
  • Constructing facilitated transport pathway in hybrid membranes by incorporating MoS2 nanosheets
    J. Membr. Sci. (IF 6.035) Pub Date : 2017-09-17
    Fusheng Pan, He Ding, Weidong Li, Yimeng Song, Hao Yang, Hong Wu, Zhongyi Jiang, Baoyi Wang, Xingzhong Cao
    更新日期:2017-09-19
  • 更新日期:2017-09-19
  • Phosphoric acid doped crosslinked polybenzimidazole (PBI-OO) blend membranes for high temperature polymer electrolyte fuel cells
    J. Membr. Sci. (IF 6.035) Pub Date : 2017-09-15
    N. Nambi Krishnan, Dickson Joseph, Ngoc My Hanh Duong, Anastasiia Konovalova, Jong Hyun Jang, Hyoung-Juhn Kim, Suk Woo Nam, Dirk Henkensmeier
    更新日期:2017-09-15
  • Preparation of Amphotericin B-Ergosterol structures and molecular simulation of water adsorption and diffusion
    J. Membr. Sci. (IF 6.035) Pub Date : 2017-09-14
    Hao-Chen Wu, Tomohisa Yoshioka, Keizo Nakagawa, Takuji Shintani, Toshinori Tsuru, Daisuke Saeki, Abdul Rajjak Shaikh, Hideto Matsuyama
    更新日期:2017-09-15
  • Promoting Permeability-Selectivity Anti-Trade-Off Behavior in Polyvinyl alcohol (PVA) Nanocomposite Membranes
    J. Membr. Sci. (IF 6.035) Pub Date : 2017-09-14
    Santi Khoonsap, Supagorn Rugmai, Wei-Song Hung, Kueir-Rarn Lee, Sujitra Klinsrisuk, Sittipong Amnuaypanich
    更新日期:2017-09-14
  • Economic Response Models for Membrane Design
    J. Membr. Sci. (IF 6.035) Pub Date : 2017-09-14
    Soojin Kwon, Sungwon Hwang, Michael Binns
    更新日期:2017-09-14
  • Mitigation of NOM Fouling of Ultrafiltration Membranes by Pre-deposited Heated Aluminum Oxide Particles with Different Crystallinity
    J. Membr. Sci. (IF 6.035) Pub Date : 2017-09-14
    Ting Liu, Bing Yang, Nigel Graham, Yuanlong Lian, Wenzheng Yu, Kening Sun
    更新日期:2017-09-14
  • 更新日期:2017-09-14
  • Modelling and prediction of organic solvent flux and retention of surfactants by organic solvent nanofiltration
    J. Membr. Sci. (IF 6.035) Pub Date : 2017-09-14
    Daniel Zedel, Matthias Kraume, Anja Drews

    A model that predicts the individual and mixed fluxes of pure solvent and surfactant through PDMS organic solvent nanofiltration membranes as well as the retention of the non-ionic surfactant Marlipal 24/70 from 1-dodecene was developed based on the solution diffusion model. In contrast to available models it requires only one fitting parameter that is independent of operating conditions. The other model parameters were estimated from detailed experimental observations independent from filtration data or literature values. Dependencies of the diffusion coefficients and molar volume on temperature and pressure, as well as membrane swelling and compaction were considered. Using the model fitted to filtration data at one operating condition it was possible to predict pure solvent flux with high accuracy for four different PDMS based membranes in a temperature range of 10°C to 45°C at pressures of 15 bar to 35bar. Phenomenological behaviour of mixed solvent and surfactant flux were described accurately in every case. For temperature and membrane thickness variations, the model predicted solvent and surfactant flux within experimental uncertainty. Retentions, however, were accurately described.

    更新日期:2017-09-14
  • Removal of Cr (VI) with a spiral wound chitosan nanofiber membrane module via dead-end filtration
    J. Membr. Sci. (IF 6.035) Pub Date : 2017-09-14
    Lei Li, Jinju Zhang, Yanxiang Li, Chuanfang Yang

    Are-generable spiral wound module of affinitive electrospun chitosan nanofiber membranes was fabricated, and the feasibility of the module for treating Cr (VI) contaminated water was studied. The effect of flow rate, initial Cr (VI) concentration, chitosan nanofiber deposition density, and other metal ions on Cr (VI) adsorption was investigated in detail. It was found that the loading capacity of the module was dependent on flow rate and nanofiber deposition density, but independent on initial Cr (VI) concentration. Lower flow rate led to higher adsorption capacity. The maximum adsorption capacity obtained with 2 g/m2 nanofiber membranes in the module was 20.5 mg/g at 10% breakthrough. The module could also adsorb Cu (II), Cd (II) and Pb (II) ions separately but showed good selectivity to Cr (VI) when these metal ions were coexistent. The dynamic adsorption behavior of the module was better fitted by Dose-Response model. Furthermore, the separation of Cr (VI) by commercial nanofiltration (NF) membranes was examined and compared with the spiral wound nanofiber membranes constructed in this work. The result showed the latter had several advantages over the former in terms of rejection, flux and ease of operation.

    更新日期:2017-09-14
  • Water and Ion Sorption, Diffusion, and Transport in Graphene Oxide Membranes Revisited
    J. Membr. Sci. (IF 6.035) Pub Date : 2017-09-13
    Young Hoon Cho, Hyo Won Kim, Hee Dae Lee, Jae Eun Shin, Byung Min Yoo, Ho Bum Park
    更新日期:2017-09-13
  • Synthesis of stable UiO-66 membranes for pervaporation separation of methanol/methyl tert-butyl ether mixtures by secondary growth
    J. Membr. Sci. (IF 6.035) Pub Date : 2017-09-13
    Feichao Wu, Lu Lin, Haiou Liu, Huanting Wang, Jieshan Qiu, Xiongfu Zhang
    更新日期:2017-09-13
  • Surface functionalization of TFC FO membranes with zwitterionic polymers: improvement of antifouling and salt-responsive cleaning properties
    J. Membr. Sci. (IF 6.035) Pub Date : 2017-09-13
    Xinyu Zhang, Jiayu Tian, Shanshan Gao, Wenxin Shi, Zhongbiao Zhang, Fuyi Cui, Shuming Zhang, Shengnan Guo, Xiaonan Yang, Hui Xie, Dongmei Liu
    更新日期:2017-09-13
  • Quantitative study of RNA transmission through ultrafiltration membranes
    J. Membr. Sci. (IF 6.035) Pub Date : 2017-09-12
    Ivan Manzano, Andrew L. Zydney

    Nucleic acid-based therapies have the potential to treat a wide range of diseases through their ability to silence and / or regulate gene expression. Strategies for the large-scale purification of RNA are still being developed, creating a need for more fundamental understanding of the behavior of RNA in different separation systems. The objective of this work was to evaluate RNA transmission through a series of composite regenerated cellulose and polyethersulfone ultrafiltration membranes with different molecular weight cutoffs. Data were obtained using Torula yeast RNA, with the size distribution evaluated by both dynamic light scattering and agarose gel electrophoresis. Results with dilute RNA solutions were strongly influenced by RNA adsorption to the composite regenerated cellulose membrane; this effect was not seen with the polyethersulfone membranes. Data for the polyethersulfone membranes were analyzed using the concentration polarization model, which describes the affects of bulk mass transfer on RNA transmission, in combination with available hydrodynamic models for membrane transport. The results provide important insights into the factors controlling RNA transmission and the potential for using ultrafiltration for the purification of nucleic acid therapeutics.

    更新日期:2017-09-12
  • Poly(ethylene oxide)-block-poly(methyl methacrylate) Diblock Copolymers as Functional Additive for Poly(vinylidene fluoride) Ultrafiltration Membranes with Tailored Separation Performance
    J. Membr. Sci. (IF 6.035) Pub Date : 2017-09-12
    Jens Meyer, Mathias Ulbricht

    In this work, poly(ethylene oxide)-block-poly(methyl methacrylate) (PEO-b-PMMA) diblock copolymers were established as functional additive for polyvinylidene fluoride (PVDF) ultrafiltration (UF) membranes, originally with the intention to increase their hydrophilicity and thereby decrease fouling. Additionally, however, it was found that copolymer micelles can be induced by complexing the PEO block of PEO-b-PMMA with specific metal salts. The formation of micelles as function of specific solution compositions was observed in dynamic light scattering and rheology experiments; the formation of PEO-metal ion complexes was shown via proton nuclear magnetic resonance (1H-NMR) spectroscopy. Integration of micelle-forming compositions into typical PVDF-based casting solutions for UF membranes could lead to a higher surface porosity and a more regular barrier pore structure through microphase separation during the nonsolvent induced phase separation process used for membrane preparation. It was found that membranes containing small amounts of PEO-b-PMMA show a significantly higher permeance than membranes made from an otherwise equal casting solution without the copolymer, while maintaining the solute rejection properties. By using different types and amounts of metal salts to complex the PEO block it was possible to tailor the molecular weight cut-off of the membranes between 30 kDa and 110 kDa. Fouling studies in lab-scale cross-flow filtration cells showed an increased relative flux recovery compared to membranes without the functional copolymer additive. The results of this study are relevant because small fractions of a tailored diblock copolymer and metal salt as additives allow tailoring the barrier and separation properties at significantly higher overall performance within an otherwise unchanged membrane manufacturing process.

    更新日期:2017-09-12
  • A novel thin-film nano-templated composite membrane with in situ silver nanoparticles loading: Separation performance enhancement and implications
    J. Membr. Sci. (IF 6.035) Pub Date : 2017-09-12
    Zhe Yang, Yichao Wu, Hao Guo, Xiao-Hua Ma, Chun-er Lin, Ying Zhou, Bin Cao, Bao-ku Zhu, Kaimin Shih, Chuyang Y. Tang
    更新日期:2017-09-12
  • Coaxial poly(lactic acid) electrospun composite membranes incorporating cellulose and chitin nanocrystals
    J. Membr. Sci. (IF 6.035) Pub Date : 2017-09-12
    Blanca Jalvo, Aji P. Mathew, Roberto Rosal
    更新日期:2017-09-12
  • Grain size control of ZIF-8 MOF membranes by seeding-free aqueous synthesis and their performances in propylene/propane separation
    J. Membr. Sci. (IF 6.035) Pub Date : 2017-09-12
    Shunsuke Tanaka, Kenta Okubo, Miki Sugita, Takahiko Takewaki
    更新日期:2017-09-12
  • Mixed matrix membranes applications: Development of a resistance-based model
    J. Membr. Sci. (IF 6.035) Pub Date : 2017-09-12
    Arian Ebneyamini, Hoda Azimi, F. Handan Tezel, Jules Thibault

    In this study, a model for the prediction of the mass transport through ideal mixed matrix membranes (MMMs) for pervaporation and gas separation processes has been introduced. A Resistance-Based (RB) model was used in conjunction with a three-directional Finite Difference (FD) numerical solution to derive a semi-empirical model for calculating the effective permeability of ideal mixed matrix membranes. Predictions of the effective permeability obtained with the proposed model were compared with the estimated permeability for ideal MMMs using numerous analytical solutions such as Maxwell, Lewis-Nielsen, Bruggeman and Hennepe models. The extended RB model was theoretically able to predict accurately the effective permeability of ideal MMMs over a large range of filler volume fraction. Higher deviations were observed between the predictions of the extended RB model and the estimations of the majority of the other models in the case of MMMs containing higher permeable fillers and larger amount of filler material.

    更新日期:2017-09-12
  • Limiting Extractable Energy from Pressure Retarded Osmosis with Different Pretreatment Costs for Feed and Draw Solutions
    J. Membr. Sci. (IF 6.035) Pub Date : 2017-09-11
    Haifeng Zhang, Wenjuan Yang, Ken Rainwater, Lianfa Song
    更新日期:2017-09-11
  • Inorganic/organic composite ion gel membrane with high mechanical strength and high CO2 separation performance
    J. Membr. Sci. (IF 6.035) Pub Date : 2017-09-11
    Fatemeh Ranjbaran, Eiji Kamio, Hideto Matsuyama
    更新日期:2017-09-11
  • Recycling of activated carbon filter backwash water using ultrafiltration: membrane fouling caused by different dominant interfacial forces
    J. Membr. Sci. (IF 6.035) Pub Date : 2017-09-11
    Tao Lin, Jianan Zhang, Wei Chen

    The reuse of activated carbon filter backwash water was performed using an ultrafiltration (UF) system and the membrane fouling mechanism was investigated using a model involving XDLVO theory and hydrodynamic interaction. Pretreatment by micro-flocculation/sedimentation removed most particulate pollutants; thus, residual organic colloids determined the details of the UF membrane fouling. The membrane fouling was divided into two periods. Membrane fouling in the initial period was determined by interfacial forces between the membrane and colloids. The calculated interfacial forces showed that permeation drag (PD) force dominated the total interfacial force at long-range, while London-van der Waals and short-range Lewis acid-base (AB) forces governed membrane fouling at short-range (<3 nm). The electrostatic double layer force, reaching its energy peak at around 10 nm, favored mitigation of membrane fouling. The initial membrane fouling could be alleviated by reducing the PD force, which was mainly associated with permeate flux. In the second membrane fouling period, a cake layer formed mostly of hydrophobic colloids retained at the membrane surface. The increasing AB force contributed mainly to the interfacial forces responsible for membrane fouling at short-range, greatly aggravating membrane fouling. The pre-ozonation of the UF influent was involved in mitigating membrane fouling in the second period. Pre-ozonation enhanced the hydrophilic properties of both cake layer and organic colloids, which clearly decreased the AB force. The pre-ozonation also narrowed the colloid size range and decreased the PD force. The use of interval pre-ozonation during the filtration process was a promising way to alleviate membrane fouling, and involved a chemical cleaning cycle extending from 15 to 18 days.

    更新日期:2017-09-11
  • Physicochemical Properties and Pervaporation Performance of Dense Membranes Based on Cellulose Acetate Propionate (CAP) and Containing Polymerizable Ionic Liquid (PIL)
    J. Membr. Sci. (IF 6.035) Pub Date : 2017-09-11
    Edyta Rynkowska, Krzysztof Dzieszkowski, Antoine Lancien, Kateryna Fatyeyeva, Anthony Szymczyk, Joanna Kujawa, Stanisław Koter, Stéphane Marais, Andrzej Wolan, Wojciech Kujawski
    更新日期:2017-09-11
  • A novel process maximizing energy conservation potential of biological treatment: Super fast membrane bioreactor
    J. Membr. Sci. (IF 6.035) Pub Date : 2017-09-11
    Seval Sözen, Senem Teksoy-Başaran, İpek Ergal, Cansu Karaca, Buşra Allı, Cansın Razbonyalı, Emine Ubay-Çokgör, Derin Orhon
    更新日期:2017-09-11
  • OXYGEN TRANSPORT IN HOLLOW FIBER MEMBRANE BIOREACTORS FOR HEPATIC 3D CELL CULTURE: A PARAMETRIC STUDY
    J. Membr. Sci. (IF 6.035) Pub Date : 2017-09-09
    Shervin Khakpour, Alberto Di Renzo, Efrem Curcio, Francesco Paolo Di Maio, Lidietta Giorno, Loredana De Bartolo
    更新日期:2017-09-10
  • An Investigation through the Validation of the Electrochemical Methods Used for Bipolar Membranes Characterization
    J. Membr. Sci. (IF 6.035) Pub Date : 2017-09-09
    Amir M. Ashrafi, Nupur Gupta, David Neděla
    更新日期:2017-09-10
  • Tailoring ceramic membrane structures of solid oxide fuel cells via polymer-assisted electrospray deposition
    J. Membr. Sci. (IF 6.035) Pub Date : 2017-09-09
    Jeong Hun Kim, Sung Soo Shin, Ho Sung Noh, Ji-Won Son, Mansoo Choi, Hyoungchul Kim
    更新日期:2017-09-10
  • Polyamide-crosslinked Graphene Oxide Membrane for Forward Osmosis
    J. Membr. Sci. (IF 6.035) Pub Date : 2017-09-08
    Limei Jin, Zhongying Wang, Sunxiang Zheng, Baoxia Mi

    A novel polyamide-graphene oxide (PA-GO) membrane was synthesized on a polyethersulfone support by first intra-crosslinking GO aggregates via m-xylylenediamine (MXDA) and then inter-crosslinking GO aggregates via trimethyle chloride (TMC). This method allows for the use of hydrophilic, more porous supports in forward osmosis (FO) membranes, thereby lending much flexibility to membrane synthesis and also potentially reducing internal concentration polarization in FO. The elemental composition, morphology, and hydrophilicity of the synthesized PA-GO membrane were characterized to confirm intra- and inter-crosslinking reactions and understand membrane properties. It was found that the mixing temperature of MXDA and GO should be controlled below 20℃ to avoid the formation of large GO aggregates and hence reduce membrane heterogeneity and defects. The performance of the PA-GO membrane was compared with that of a commercial FO membrane using trisodium citrate (TSC), Na2SO4, and MgCl2, respectively, as draw solutes. Under the same osmotic pressure, the water flux of the PA-GO membrane was the highest with TSC as draw solute, moderate with Na2SO4, and almost zero with MgCl2, while the ranking of solute fluxes followed a reverse order, revealing that enabling an effective solute barrier plays an important role in making FO membranes with high water flux as well as low solute flux.

    更新日期:2017-09-09
  • Total water production capacity inversion phenomenon in multi-stage direct contact membrane distillation: A theoretical study
    J. Membr. Sci. (IF 6.035) Pub Date : 2017-09-08
    Jung-Gil Lee, Ahmad S. Alsaadi, Ayman M. Karam, Lijo Francis, Sofiane Soukane, Noreddine Ghaffour

    The low thermal efficiency and low water production are among the major challenges that prevent membrane distillation (MD) process from being commercialized. In an effort to design an efficient multi-stage direct contact MD (DCMD) unit through mathematical simulation, a new phenomenon that we refer to as total water production capacity inversion (WPI) has been detected. It is represented by a decrease in the total water production beyond a number of stages or a certain module length. WPI phenomenon, which was confirmed by using two different mathematical models validated experimentally, was found to take place due to the decrease in water vapor flux across the membrane as well as the increase in heat loss by conduction as the membrane length increases. Therefore, WPI should be considered as a critical MD design-criterion, especially for large scale units. Investigations conducted for a simulated multi-stage DCMD process showed that inlet feed and permeate temperatures difference, feed and permeate flow rates, and feed salinity have different effects on WPI. The number of stages (or module length at constant width) that leads to a maximum water production has been determined for different operating parameters. Decreasing inlet feed and permeate temperatures difference, or inlet feed and permeate flow rates and increasing inlet feed temperature at constant temperature difference or inlet feed salinity cause the WPI to take place at lower number of stages. Even though the feed salinity affects negligibly the mean permeate flux, it was clearly shown that it can affect WPI. The results presented herein unveil a hidden phenomenon that is likely to occur during process scale-up procedures and should be considered by process engineers for a proper choice of system design and operating conditions.

    更新日期:2017-09-09
  • Highly Permeable and Mechanically Durable Forward Osmosis Membranes Prepared Using Polyethylene Lithium Ion Battery Separators
    J. Membr. Sci. (IF 6.035) Pub Date : 2017-09-08
    Soon Jin Kwon, Sang-Hee Park, Min Sang Park, Jong Suk Lee, Jung-Hyun Lee
    更新日期:2017-09-09
  • Investigation of amino and amidino functionalized Polyhedral Oligomeric SilSesquioxanes (POSS®) nanoparticles in PVA-based hybrid membranes for CO2/N2 separation
    J. Membr. Sci. (IF 6.035) Pub Date : 2017-09-08
    Gabriel Guerrero, May-Britt Hägg, Gertrude Kignelman, Christian Simon, Thijs Peters, Nicolas Rival, Christelle Denonville

    Hybrid membranes were prepared using amino-functionalized Polyhedral Oligomeric SilSesquioxanes (POSS®) nanoparticles, with polyvinyl alcohol (PVA) and dip coated on Polyphenylene Oxide (PPO) as support. Different functionalities of amino and amidino POSS® have been developed and evaluated for CO2/N2 separation in order to understand the polymer/nanoparticle interaction and their impact on the CO2 transport mechanism. CO2 absorption and desorption studies were carried out to understand the chemical behavior of the CO2 transport phenomena in solution. The as-obtained hybrid selective membrane materials were analyzed using various techniques, such as TGA, DSC, FT-IR, and XRD, while the gas permeation properties were evaluated in a CO2/N2 mixture at room temperature. The membranes prepared with the amino- and amidino-functionalized particles show a CO2 permeability of 0.53 and 0.71 m3(STP)/m2·bar·hr, respectively at a CO2/N2 selectivity of around 40. Differences are explained through CO2 absorption and desorption studies performed in solution showing a higher CO2 cyclic capacity for the amidino particles.However, when comparing these results with the bare PPO/PVA system, no clear advantageous effect of the addition of the nanoparticles was observed. Due to the interaction of the nanoparticles with the polymer matrix, the particles do not exhibit a carrier transport in the composite membranes. The addition of the amino and amidino POSS® showed that the expected increase in CO2 permeance is not reached due to the interaction of the nanoparticles with the polymer matrix. Moreover, the amino & amidino POSS® do not exhibit a carrier transport in the composite membranes.

    更新日期:2017-09-08
  • A novel imidazolium-based amphoteric membrane for high-performance vanadium redox flow battery
    J. Membr. Sci. (IF 6.035) Pub Date : 2017-09-08
    Xiaoming Yan, Caimian Zhang, Yan Dai, Wenji Zheng, Xuehua Ruan, Gaohong He

    A novel amphoteric membrane was prepared using imidazolium-functionalized polysulfone (ImPSf) as the base polymer and sulfonated poly (ether ether ketone) (SPEEK) as the acid polymer for vanadium flow battery applications. The introduction of the ImPSf effectively resists the migration of vanadium ions owing to the Donnan repelling effect of the imidazolium cations on the vanadium ions and the low swelling ratio of the amphoteric membranes due to the ionic cross-linked interactions between the imidazolium and sulfonic groups. The amphoteric membrane with an ImPSf mass ratio of 17% shows a vanadium permeability of 1.5×10−8 cm2 s−1 that is much lower than that of Nafion212 (21×10−8 cm2 s−1). Having a high IEC of 2.04 mmol g−1, it also exhibits a low area resistance of 0.48 Ω cm−2 that is comparable to that of Nafion212 membrane (0.41 Ω cm−2). As a result, the VFB cell with the amphoteric membrane exhibits high performances even at high current densities, i.e. at a current density of 200 mA cm−2, and the amphoteric membrane achieves a coulombic efficiency of 97.5% and an energy efficiency of 77.3%, both of which are higher than those of Nafion212 (92.4% and 73.4%). These results indicate that the ImPSf/SPEEK amphoteric membrane is promising for VFB applications.

    更新日期:2017-09-08
  • Unpacking compaction: Effect of hydraulic pressure on alginate fouling
    J. Membr. Sci. (IF 6.035) Pub Date : 2017-09-08
    Emily W. Tow, John H. Lienhard V
    更新日期:2017-09-08
  • 更新日期:2017-09-08
  • A novel chloromethylated/quaternized poly(sulfone)/poly(vinylidene fluoride) anion exchange membrane with ultra-low vanadium permeability for all vanadium redox flow battery
    J. Membr. Sci. (IF 6.035) Pub Date : 2017-09-07
    Jing Ren, Yichao Dong, Jicui Dai, Huili Hu, Yongming Zhu, Xiangguo Teng
    更新日期:2017-09-07
  • The performance of integrally skinned polyetherimide asymmetric nanofiltration membranes with organic solvents
    J. Membr. Sci. (IF 6.035) Pub Date : 2017-09-07
    Yuan Zhang, Min Zhong, Beibei Luo, Jiandong Li, Qipeng Yuan, Xiao Jin Yang

    Nanofiltration (NF) has become an emerging technology in organic solvent systems and the preparation of organic solvent resistant nanofiltration (SRNF) membranes is the most important aspect of the technology. In this study, integrally skinned polyetherimide (PEI) asymmetric nanofiltration (NF) membranes were prepared by phase inversion in which dimethylacetamide (DMAc) and polyvinyl pyrrolidone (PVP-K30) were employed as solvents and additives in casting solutions. The prepared PEI membranes were characterized by scanning electronic microscopy (SEM) and evaluated in terms of solvent compatibility, solute rejection and solvent flux. The solvents employed were ethanol, isopropyl alcohol, n-hexane and carbon tetrachloride and the solute molecules were rose bengal (molecular weight 1017 Da) and methylene blue (molecular weight 374 Da).The prepared PEI NF membrane was compared with four commercial SRNF composite membranes (MPF-34, MPF-44, STARMEM 122 and Solsep 010706). The results demonstrated that the PEI membranes were stable in all of the four solvents studied and showed better performance than the four commercial SRNF membranes with regard to solvent compatibility and rejection from ethanol solutions. The PEI membrane had ethanol fluxes of 4–8 L m−2 h−1 at 100 psi and 95% rejection for methylene blue in ethanol.

    更新日期:2017-09-07
  • Novel Cylindrical Cross-Flow Hollow Fiber Membrane Module for Direct Contact Membrane Distillation-based Desalination
    J. Membr. Sci. (IF 6.035) Pub Date : 2017-09-06
    Dhananjay Singh, Lin Li, Gordana Obuscovic, John Chau, Kamalesh K. Sirkar

    Direct contact membrane distillation-based desalination is attractive especially for high salt concentrations. We recently developed successfully a hollow-fiber membrane (HFM) based rectangular module with hot brine in cross-flow over the HFMs and obtained high and stable water flux under demanding scaling conditions. This module design with a low surface area/device volume is inadequate for larger-scale plants. A novel cylindrical cross-flow module containing high-flux composite hydrophobic HFMs is described for membrane surface areas, 0.15 and 0.6 m2, using porous fluorosiloxane-coated porous polypropylene hollow fibers. This simple and easily-scalable module design packs four times membrane surface area/unit equipment volume compared to earlier design. Distilled water production rates from 1 wt% saline feed was studied over brine temperatures of 60–91°C. A model developed to describe the observed water production rates in dead-end feed introduction configuration appears to describe observed water production rates well. Model predictions were explored for a range of HFM lengths and larger HFM ID to compare with those from rectangular modules with shorter HFMs.

    更新日期:2017-09-07
  • Fabrication of composite nanofiltration membrane by incorporating attapulgite nanorods during interfacial polymerization for high water flux and antifouling property
    J. Membr. Sci. (IF 6.035) Pub Date : 2017-09-06
    Mengyuan Wu, Tianyi Ma, Yanlei Su, Hong Wu, Xinda You, Zhongyi Jiang, Roni Kasher
    更新日期:2017-09-07
  • High efficient water/ethanol separation by a mixed matrix membrane incorporating MOF filler with high water adsorption capacity
    J. Membr. Sci. (IF 6.035) Pub Date : 2017-09-06
    Qianqian Li, Quan Liu, Jing Zhao, Yinying Hua, Jiajia Sun, Jingui Duan, Wanqin Jin
    更新日期:2017-09-07
  • A superhydrophobic bromomethylated poly(phenylene oxide) as a multifunctional polymer filler in SPEEK membrane towards neat methanol operation of direct methanol fuel cells
    J. Membr. Sci. (IF 6.035) Pub Date : 2017-09-06
    Xupo Liu, Yunfeng Zhang, Yazhou Chen, Cuicui Li, Jiaming Dong, Quan Zhang, Jiaying Wang, Zehui Yang, Hansong Cheng

    Development of novel proton exchange membrane (PEM) with the aim toward neat methanol operation of direct methanol fuel cell (DMFC) has attracted increasing attention. Proton exchange membrane technology with remarkably low methanol permeability has been considered as one of the most facile ways to approach this target. Here, sulfonated poly(ether ether ketone) (SPEEK) membrane was modified by blending with superhydrophobic bromomethylated poly(phenylene oxide) (BPPO). The fabricated SPEEK/BPPO membranes possess obviously low methanol permeability, which is attributed to the formed interrupted methanol transport channels arising from the combined properties of the hydrophobic BPPO polymeric backbone, the formed spherical BPPO obstacles and the cross-linking networks derived from the Friedel-Craft reaction between bromobenzyl groups and nucleophilic phenyl rings. Therefore, the SPEEK/BPPO membrane DMFC demonstrates a much higher cell performance both at low methanol concentration and high methanol concentration than the Nafion 117 DMFC. In particular, the actual value of the maximum power density at high methanol concentration of 20 M suggests that the SPEEK/BPPO membranes can be considered as a desirable candidate for potential application in high methanol concentration DMFCs.

    更新日期:2017-09-07
  • Comparison of organic fouling resistance of thin-film composite membranes modified by hydrophilic silica nanoparticles and zwitterionic polymer brushes
    J. Membr. Sci. (IF 6.035) Pub Date : 2017-09-06
    Caihong Liu, Jongho Lee, Chad Small, Jun Ma, Menachem Elimelech
    更新日期:2017-09-07
  • High-temperature stability of Pd alloy membranes containing Cu and Au
    J. Membr. Sci. (IF 6.035) Pub Date : 2017-09-06
    Haiyuan Jia, Ping Wu, Gaofeng Zeng, Eduardo Salas Colera, Aida Serrano, German R. Castro, Hengyong Xu, Chenglin Sun, Andreas Goldbach

    High-temperature stability of Pd-based membranes benefits their application in steam reformers and sulfur-contaminated H2 streams because both membrane reforming efficiency and sulfur tolerance of Pd alloys increase much with temperature. Hence, we investigated PdCu, PdAu, and PdCuAu membranes supported on porous ceramic tubes between 500 °C and 650 °C. Remarkably, PdCu membranes were much more stable than Au-containing ones. The H2 permeation rates of some PdAu and PdCuAu membranes declined at 550 °C with substantially increasing N2 fluxes. This was triggered by severe morphological deformation of the Au alloy films into stoichiometrically inhomogeneous, cavernous structures. The H2 fluxes of the PdCu membranes started to decline at 650 °C with leak flows increasing slightly. Moreover, the PdCu layer morphology remained dense and compositionally homogeneous even after testing for up to 4800 h between 500 and 650 °C. The strikingly different high-temperature stability can be understood by considering the divergent surface segregation tendencies of Cu and Au and their differing impact on hydrogen solubility in Pd alloys. As a result, Au may desorb much more easily from membranes than Cu leading to structural instability above 500 °C during operation in H2. The instability of PdAu membranes at high temperatures may be mitigated by addition of sufficient Cu to obtain ternary membranes with good H2 permeability and better thermal stability.

    更新日期:2017-09-06
  • Water Transport and Mechanical Response of Block Copolymer Ion-Exchange Membranes for Water Purification
    J. Membr. Sci. (IF 6.035) Pub Date : 2017-09-06
    Shawn Chen, Carl Willis, Kenneth R. Shull

    A membrane inflation experiment was used to measure the mechanical response of ABCBA pentablock copolymer membranes designed to transport water through the coalescence of water-swollen polyelectrolyte domains within the polymer. Creep resistance of the block copolymers originates from glassy A blocks of either poly(p-methyl styrene) or poly(t-butyl styrene), and water permeability is attributed to the polystyrene C block that is partially sulfonated. The creep resistance of the membranes in the wet state was enhanced by replacing the poly(t-butyl styrene) A blocks with poly(p-methylstyrene), or by decreasing the molecular weight of the polyelectrolyte C block. Both of these substitutions increased the creep resistance of the membranes in a wet state while retaining a high degree of water permeability.

    更新日期:2017-09-06
  • Structural and chemical stability of high performance Ce0.8Gd0.2O2-δ - FeCo2O4 dual phase oxygen transport membranes
    J. Membr. Sci. (IF 6.035) Pub Date : 2017-09-05
    M. Ramasamy, E.S. Persoon, S. Baumann, M. Schroeder, F. Schulze-Küppers, D. Görtz, R. Bhave, M. Bram, W.A. Meulenberg

    Ceramic oxide membranes are widely being researched for Carbon Capture and Storage/Utilization sector applications. Foreseen applications of these membranes are oxygen generation for oxyfuel combustion in e.g. power plants, glass-, cement- or steel production. Major drawback with Mixed Ionic and Electronic Conducting (MIEC) perovskite structure membranes is their limited long term stability at high temperatures in aggressive atmospheres. Dual phase composite membranes have been reported to excel overcoming this drawback. In addition to performance evaluation, Ce0.8Gd0.2O2-δ - FeCo2O4 (CGO-FCO) membranes were subjected to stability test in flue gas conditions closely mimicking industrial flue gas atmosphere. The dual phase composites are investigated for their phase stability at the operating temperature of 850 °C in a gradient of oxygen chemical potential. The composites were also exposed to a series of gas mixtures over a period of time at their operating temperature to test for the chemical stability. CGO-FCO membranes are identified to possess chemical stability in gas mixtures of CO2, SO2 along with oxygen over a period of 200 h at 850 °C under oxygen partial pressure gradient.

    更新日期:2017-09-06
  • A new zeolitic hydroxymethylimidazolate material and its use in mixed matrix membranes based on 6FDA-DAM for gas separation
    J. Membr. Sci. (IF 6.035) Pub Date : 2017-09-05
    Adelaida Perea-Cachero, Javier Sánchez-Laínez, Ángel Berenguer-Murcia, Diego Cazorla-Amorós, Carlos Téllez, Joaquín Coronas
    更新日期:2017-09-06
  • Construction of interconnected micropores in poly(arylene ether) based single ion conducting blend polymer membranes via vapor-induced phase separation
    J. Membr. Sci. (IF 6.035) Pub Date : 2017-09-05
    Yazhou Chen, Zhong Li, Xupo Liu, Danli Zeng, Yunfeng Zhang, Yubao Sun, Hanzhong Ke, Hansong Cheng

    We report the construction of interconnected micropores in a poly(arylene ether) based single ion conducting blend polymer electrolyte by tuning phase separation. Bis(4-fluorine benzene sulfonyl)imide is copolymerized with bis(4-hydroxy benzene sulfonyl)imide and bisphenol A separately to form two types of AB alternating block copolymers, i.e., lithiated poly(bis(benzene sulfonyl)imide)ether (LiPBIE) and lithiated poly(bisphenol A-alt-bis(4-fluorine benzene sulfonyl)imide)ether (LiPAFE). The former is immiscible with poly(vinylidene fluoride-co-hexafluoropropylene) (PVDF-HFP) and the latter is well entangled with the binder upon introducing the bisphenol group. The results reveal that the LiPBIE blend film exhibits an interconnected microporous structure while the LiPAFE blend film does not. Even if the ion exchange capacity (IEC) of the LiPAFE blend film is raised to the level of the LiPBIE blend film by reducing the proportion of PVDF-HFP, the film is porous only on the surface but remains dense in its bulk. The comparative experiments confirm that the disparity of polarity and solubility between the ionomers and the binder is largely responsible for the phase separation. The microporous single ion conducting gel polymer electrolyte offers an ionic conductivity of 0.52 mS cm−1 at 25 °C and its membrane displays the capability of dendrite suppression. A battery incorporating the electrolyte film exhibits excellent rate performance and electrochemical stability.

    更新日期:2017-09-06
  • PEO-rich Semi-Interpenetrating Polymer Network (s-IPN) Membranes for CO2 Separation
    J. Membr. Sci. (IF 6.035) Pub Date : 2017-09-05
    Gregory K. Kline, Jennifer R. Weidman, Qinnan Zhang, Ruilan Guo
    更新日期:2017-09-06
  • Large osmotic energy harvesting from functionalized conical nanopore suitable for membrane applications
    J. Membr. Sci. (IF 6.035) Pub Date : 2017-09-05
    Sébastien Balme, Tianji Ma, Emmanuel Balanzat, Jean-Marc Janot
    更新日期:2017-09-05
  • Storable Hydrogen Production by Reverse Electro-Electrodialysis (REED)
    J. Membr. Sci. (IF 6.035) Pub Date : 2017-09-05
    Xia Chen, Chenxiao Jiang, Yilue Zhang, Yaoming Wang, Tongwen Xu

    Reverse electrodialysis (RED) as an emerging technology to generate electric power through two different salinity solutions, has deserved full attention in the past decade. Nevertheless, the current generated by the RED may not match the power network and hinder its development. In this work, a novel method called Reverse Electro-Electrodialysis (REED) system was firstly proposed as a method for pure and storable hydrogen production as alternative. Instead of the conventional reversible redox couples, hydrochloric acid and sodium hydroxide are used respectively as cathode solution and anode solution to reduce hydrogen evolution potential. The performance on energy recovery and H2 production was evaluated by changing ΔC (solution salinity difference). A mathematical model derivate from Nernst–Planck equation was established to correlate the acidic catholyte concentration with electrochemical effect. The results indicate that H2 production is highly dependent on the current density and the electrode solution's concentration, i.e. the salinity gradient and hydrogen evolution over-potential. A good matching was found between predictions and experiment results.

    更新日期:2017-09-05
  • Studies of the Synergistic Effects of Crosslink Density and Crosslink Inhomogeneity on Crosslinked PEO Membranes for CO2-selective Separations
    J. Membr. Sci. (IF 6.035) Pub Date : 2017-09-04
    Gregory K. Kline, Jennifer R. Weidman, Qinnan Zhang, Ruilan Guo
    更新日期:2017-09-04
  • High pressure adsorption, permeation and swelling of carbon membranes – measurements and modelling at up to 20 MPa
    J. Membr. Sci. (IF 6.035) Pub Date : 2017-09-04
    Nicolas Kruse, Yuliya Schießer, Norman Reger-Wagner, Hannes Richter, Ingolf Voigt, Gerd Braun, Jens-Uwe Repke
    更新日期:2017-09-04
  • Supported protic ionic liquid membrane based on 3-(trimethoxysilyl)propan-1-aminium acetate for the highly selective separation of CO2
    J. Membr. Sci. (IF 6.035) Pub Date : 2017-09-01
    Ayesha Ilyas, Nawshad Muhammad, Mazhar Amjad Gilani, Khurshid Ayub, Ivo F.J. Vankelecom, Asim Laeeq Khan
    更新日期:2017-09-04
  • 更新日期:2017-09-04
  • Tunable magneto-responsive mesoporous block copolymer membranes
    J. Membr. Sci. (IF 6.035) Pub Date : 2017-09-01
    Yanchun Tang, Xi Lin, Kohzo Ito, Ling Hong, Takashi Ishizone, Hideaki Yokoyama, Mathias Ulbricht
    更新日期:2017-09-04
  • Investigation and Comparison of Mixed Matrix Membranes Composed of Polyimide Matrimid with ZIF – 8, Silicalite, and SAPO – 34
    J. Membr. Sci. (IF 6.035) Pub Date : 2017-09-01
    D. Carter, F.H. Tezel, B. Kruczek, H. Kalipcilar

    Mixed Matrix type membranes (MMMs) containing 10 wt% of either silicalite, SAPO – 34, and ZIF − 8 in polyimide Matrimid were fabricated and tested for their suitability to separate a number of gas mixtures by conducting single gas permeation experiments using H2, CO2, N2, and CH4 gases. The transport of these gases through the polymeric and inorganic membrane phases, as well as their interfacial voids, have additionally been distinguished from each other by fabricating MMMs containing non-calcined fillers of silicalite and SAPO-34. The ideal selectivities that have been calculated using the experimentally determined permeabilities can be attributed to the relative pore size and volume of the fillers in each membrane, as well as changes to the mobility of polymer chains in the vicinity of fillers. Due to its large pore volume as well as simultaneous reductions of interfacial voids and polymer chain mobility, ideal selectivities and gas permeabilities that are higher than those achieved by a neat Matrimid membrane have been achieved using ZIF – 8 containing MMMs. For the ZIF – 8 containing membranes, the largest permeabilities for H2, CO2, N2, and CH4 were found to be 51.1, 15.5, 0.64, and 0.54 barrer, respectively. This H2 permeability in particular was found to be the most outstanding out of all of the membranes that have been tested, and ideal selectivities for the separation of H2/N2, and H2/CH4, were found to be 80.3 and 102, respectively. The performance of the membranes that were fabricated using uncalcined silicalite and SAPO-34 also suggest that the structure of the Matrimid phase is altered by the addition of these fillers as greater selectivities at the expense of permeability were also achieved using these MMMs in comparison to a neat Matrimid membrane.

    更新日期:2017-09-04
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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