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Membranes

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https://www.readbyqxmd.com/read/30011789/single-gas-permeance-performance-of-high-silica-ssz-13-zeolite-membranes
#1
Li Liang, Meihua Zhu, Le Chen, Caijun Zhong, Yiming Yang, Ting Wu, Heli Wang, Izumi Kumakiri, Xiangshu Chen, Hidetoshi Kita
Continuous and high silica SSZ-13 zeolite membranes were prepared on porous mullite supports from high SiO₂/Al₂O₃ ratio or aluminum-free precursor synthesis gel. Single gas permeance (CO₂ and CH₄) of the high silica SSZ-13 zeolite membrane was decreased with the SiO₂/Al₂O₃ ratio in the precursor synthesis gel, while the ideal CO₂/CH₄ selectivity of the membrane was gradually increased. Moreover, effects of synthesis conditions (such as H₂O/SiO₂ and RNOH/SiO₂ ratios of precursor synthesis gel, crystallization time) on the single gas permeance performance of high silica SSZ-13 zeolite membranes were studied in detail...
July 13, 2018: Membranes
https://www.readbyqxmd.com/read/29997383/performance-of-pes-lsmm-ogcn-photocatalytic-membrane-for-phenol-removal-effect-of-ogcn-loading
#2
Noor Elyzawerni Salim, Nor A M Nor, Juhana Jaafar, Ahmad F Ismail, Takeshi Matsuura, Mohammed R Qtaishat, Mohd H D Othman, Mukhlis A Rahman, Farhana Aziz, Norhaniza Yusof
In designing a photocatalytic oxidation system, the immobilized photocatalyst technique becomes highly profitable due to its promising capability in treating organic pollutants such as phenols in wastewater. In this study, hydrophiLic surface modifying macromolecules (LSMM) modified polyethersulfone (PES) hybrid photocatalytic membranes incorporated with oxygenated graphitic carbon nitride (OGCN) was successfully developed using phase inversion technique. The effectiveness of the hybrid photocatalytic membrane was determined under different loading of OGCN photocatalyst (0, 0...
July 11, 2018: Membranes
https://www.readbyqxmd.com/read/29996562/ionic-liquid-based-electrolyte-membranes-for-medium-high-temperature-lithium-polymer-batteries
#3
Guk-Tae Kim, Stefano Passerini, Maria Carewska, Giovanni Battista Appetecchi
Li⁺-conducting polyethylene oxide-based membranes incorporating N -butyl- N -methylpyrrolidinium bis(trifluoromethanesulfonyl)imide are used as electrolyte separators for all-solid-state lithium polymer batteries operating at medium-high temperatures. The incorporation of the ionic liquid remarkably improves the thermal, ion-transport and interfacial properties of the polymer electrolyte, which, in combination with the wide electrochemical stability even at medium-high temperatures, allows high current rates without any appreciable lithium anode degradation...
July 10, 2018: Membranes
https://www.readbyqxmd.com/read/29996486/separation-of-organic-compounds-from-abe-model-solutions-via-pervaporation-using-activated-carbon-pdms-mixed-matrix-membranes
#4
Hoda Azimi, Arian Ebneyamini, F Handan Tezel, Jules Thibault
The pervaporation separation of organic compounds from acetone-butanol-ethanol (ABE) fermentation model solutions was studied using activated carbon (AC) nanoparticle-poly (dimethylsiloxane) (PDMS) mixed matrix membranes (MMM). The effects of the operating conditions and nanoparticle loading content on the membrane performance have been investigated. While the separation factor increased continuously, with an increase in the concentration of nanoparticles, the total flux reached a maximum in the MMM with 8 wt % nanoparticle loading in PDMS...
July 10, 2018: Membranes
https://www.readbyqxmd.com/read/29986552/concentration-and-temperature-effects-on-water-and-salt-permeabilities-in-osmosis-and-implications-in-pressure-retarded-osmosis
#5
Edvard Sivertsen, Torleif Holt, Willy R Thelin
Osmotic power extracted from the mixing of freshwater with seawater is a renewable energy resource that has gained increasing attention during recent years. The estimated energy can significantly contribute to the production of power worldwide. However, this power production will be subject to variation due to both local conditions and seasonal variation. The present paper explores the effect of concentration and temperature on water and salt fluxes in osmosis at zero transmembrane pressure for five different membranes...
July 8, 2018: Membranes
https://www.readbyqxmd.com/read/29973524/texas-sour-orange-juice-used-in-scaffolds-for-tissue-engineering
#6
Mandana Akia, Nataly Salinas, Cristobal Rodriguez, Robert Gilkerson, Luis Materon, Karen Lozano
Fine fibers of polyhydroxybutyrate (PHB), a biopolymer, were developed via a centrifugal spinning technique. The developed fibers have an average diameter of 1.8 µm. Texas sour orange juice (SOJ) was applied as a natural antibacterial agent and infiltrated within the fibrous membranes. The antibacterial activity against common Gram-positive and Gram-negative bacteria ( Staphylococcus aureus and Escherichia coli , respectively) was evaluated as well as cell adhesion and viability. The PHB/SOJ scaffolds showed antibacterial activity of up to 152% and 71% against S...
July 4, 2018: Membranes
https://www.readbyqxmd.com/read/29973499/modeling-ionic-strength-effects-on-hollow-fiber-nanofiltration-membrane-mass-transfer
#7
David T Yonge, Paul G Biscardi, Steven J Duranceau
In this research, we investigated the influence of feedwater ionic strength on diffusion of divalent ions through a hollow-fiber nanofiltration membrane. The results indicated that solute flux of magnesium was increased as a result of elevating the ionic strength in the feedwater. Specifically, the feedwater ionic strength was observed to have a nonlinear impact on the diffusion of magnesium during the nanofiltration process, which was under-predicted by the homogeneous solution diffusion (HSD) model. This result suggested that elevating the feedwater ionic strength had reduced the strength of the electrostatic double layer at the membrane surface...
July 4, 2018: Membranes
https://www.readbyqxmd.com/read/29966396/ionic-conductivity-and-cycling-stability-improvement-of-pvdf-nano-clay-using-pvp-as-polymer-electrolyte-membranes-for-lifepo%C3%A2-batteries
#8
Endah R Dyartanti, Agus Purwanto, I Nyoman Widiasa, Heru Susanto
In this paper, we present the characteristics and performance of polymer electrolyte membranes (PEMs) based on poly(vinylidene fluoride) (PVDF). The membranes were prepared via a phase-inversion method (non-solvent-induced phase separation (NIPS)). As separators for lithium battery systems, additive modified montmorillonite (MMT) nano-clay served as a filler and poly(vinylpyrrolidone) (PVP) was used as a pore-forming agent. The membranes modified with an additive (8 wt % nano-clay and 7 wt % PVP) showed an increased porosity (87%) and an uptake of a large amount of electrolyte (801...
July 1, 2018: Membranes
https://www.readbyqxmd.com/read/29933602/chemical-vapor-deposition-of-photocatalyst-nanoparticles-on-pvdf-membranes-for-advanced-oxidation-processes
#9
Giovanni De Filpo, Elvira Pantuso, Katia Armentano, Patrizia Formoso, Gianluca Di Profio, Teresa Poerio, Enrica Fontananova, Carmen Meringolo, Alexander I Mashin, Fiore P Nicoletta
The chemical binding of photocatalytic materials, such as TiO₂ and ZnO nanoparticles, onto porous polymer membranes requires a series of chemical reactions and long purification processes, which often result in small amounts of trapped nanoparticles with reduced photocatalytic activity. In this work, a chemical vapor deposition technique was investigated in order to allow the nucleation and growth of ZnO and TiO₂ nanoparticles onto polyvinylidene difluoride (PVDF) porous membranes for application in advanced oxidation processes...
June 21, 2018: Membranes
https://www.readbyqxmd.com/read/29921794/modeling-fixed-bed-membrane-reactors-for-hydrogen-production-through-steam-reforming-reactions-a-critical-analysis
#10
Maria Anna Murmura, Stefano Cerbelli, Maria Cristina Annesini
Membrane reactors for hydrogen production have been extensively studied in the past years due to the interest in developing systems that are adequate for the decentralized production of high-purity hydrogen. Research in this field has been both experimental and theoretical. The aim of this work is two-fold. On the one hand, modeling work on membrane reactors that has been carried out in the past is presented and discussed, along with the constitutive equations used to describe the different phenomena characterizing the behavior of the system...
June 19, 2018: Membranes
https://www.readbyqxmd.com/read/29921771/application-of-novel-anion-exchange-blend-membranes-aebms-to-vanadium-redox-flow-batteries
#11
Hyeongrae Cho, Henning M Krieg, Jochen A Kerres
Both cation-exchange membranes and anion-exchange membranes are used as ion conducting membranes in vanadium redox flow batteries (VRFBs). Anion-exchange membranes (AEMs) are applied in vanadium redox flow batteries due to the high blocking property of vanadium ions via the Donnan exclusion effect. In this study, novel anion-exchange blend membranes (AEBMs) were prepared, characterized, and applied in VRFBs. Bromomethylated poly(2,6-dimethyl-1,4-phenylene oxide), poly[(1-(4,4′-diphenylether)-5-oxybenzimidazole)-benzimidazole] (PBI-OO) and sulfonated polyether sulfone polymer were combined to prepare 3-component AEBMs with 1,2,4,5-tetramethylimidazole (TMIm) for quaternization...
June 19, 2018: Membranes
https://www.readbyqxmd.com/read/29914166/estimating-co%C3%A2-n%C3%A2-permselectivity-through-si-al-5-small-pore-zeolites-ptmsp-mixed-matrix-membranes-influence-of-temperature-and-topology
#12
Clara Casado-Coterillo, Ana Fernández-Barquín, Susana Valencia, Ángel Irabien
In the present work, the effect of zeolite type and topology on CO₂ and N₂ permeability using zeolites of different topology (CHA, RHO, and LTA) in the same Si/Al = 5, embedded in poly(trimethylsilyl-1-propyne) (PTMSP) is evaluated with temperature. Several models are compared on the prediction of CO₂/N₂ separation performance and then the modified Maxwell models are selected. The CO₂ and N₂ permeabilities through these membranes are predicted with an average absolute relative error (AARE) lower than 0...
June 16, 2018: Membranes
https://www.readbyqxmd.com/read/29914072/membrane-distillation-trial-on-textile-wastewater-containing-surfactants-using-hydrophobic-and-hydrophilic-coated-polytetrafluoroethylene-ptfe-membranes
#13
Jesús Villalobos García, Noel Dow, Nicholas Milne, Jianhua Zhang, Leslie Naidoo, Stephen Gray, Mikel Duke
Treating wastewater from textile plants using membrane distillation (MD) has great potential due to the high-salinity wastes and availability of waste heat. However, textile wastewaters also contain surfactants, which compromise the essential hydrophobic feature of the membrane, causing membrane wetting. To address this wetting issue, a custom-made membrane consisting of a hydrophilic layer coated on hydrophobic polytetrafluoroethylene (PTFE) was tested on textile wastewater in a pilot MD setup, and compared with a conventional hydrophobic PTFE membrane...
June 15, 2018: Membranes
https://www.readbyqxmd.com/read/29904036/progress-on-incorporating-zeolites-in-matrimid-%C3%A2-5218-mixed-matrix-membranes-towards-gas-separation
#14
REVIEW
Roberto Castro-Muñoz, Vlastimil Fíla
Membranes, as perm-selective barriers, have been widely applied for gas separation applications. Since some time ago, pure polymers have been used mainly for the preparation of membranes, considering different kinds of polymers for such preparation. At this point, polyimides (e.g., Matrimid® 5218) are probably one of the most considered polymers for this purpose. However, the limitation on the performance relationship of polymeric membranes has promoted their enhancement through the incorporation of different inorganic materials (e...
June 14, 2018: Membranes
https://www.readbyqxmd.com/read/29890715/-modified-liquid%C3%A2-liquid-displacement-porometry-and-its-applications-in-pd-based-composite-membranes
#15
Lei Zheng, Hui Li, Haijun Yu, Guodong Kang, Tianying Xu, Jiafeng Yu, Xinzhong Li, Hengyong Xu
For H₂ separation by Pd-based composite membranes, the pore mouth size distribution of the porous support immediately affects the quality of the deposited layer, including continuity and defect/pinhole formation. However, there is a lack of convenient and effective methods for characterization of pore mouth size of porous supports as well as of defect distribution of dense Pd-based composite membranes. Here we introduce a novel method by modifying conventional liquid⁻liquid displacement porometry. When the pore tunnels are filled with Liquid B and the outer surface is occupied by Liquid A, the reopening of the pore mouth depends on the pressure of Liquid B and the interfacial tension at the position of the pore mouth, from which the pore mouth size can be determined according to the Young⁻Laplace equation...
June 8, 2018: Membranes
https://www.readbyqxmd.com/read/29890680/co%C3%A2-separation-in-nanocomposite-membranes-by-the-addition-of-amidine-and-lactamide-functionalized-poss-%C3%A2-nanoparticles-into-a-pva-layer
#16
Gabriel Guerrero, May-Britt Hägg, Christian Simon, Thijs Peters, Nicolas Rival, Christelle Denonville
In this article, we studied two different types of polyhedral oligomeric silsesquioxanes (POSS® ) functionalized nanoparticles as additives for nanocomposite membranes for CO₂ separation. One with amidine functionalization (Amidino POSS® ) and the second with amine and lactamide groups functionalization (Lactamide POSS® ). Composite membranes were produced by casting a polyvinyl alcohol (PVA) layer, containing either amidine or lactamide functionalized POSS® nanoparticles, on a polysulfone (PSf) porous support...
June 8, 2018: Membranes
https://www.readbyqxmd.com/read/29874781/applicability-of-polyactive%C3%A2-thin-film-composite-membranes-for-co%C3%A2-separation-from-c%C3%A2-h%C3%A2-containing-multi-component-gas-mixtures-at-pressures-up-to-30-bar
#17
Karina Schuldt, Jan Pohlmann, Sergey Shishatskiy, Torsten Brinkmann
The PolyActive™ thin film composite membrane (TFCM) has already been successfully applied for CO₂ separation tasks at feed pressures up to 10 bar. To investigate the applicability at higher pressures, measurements were undertaken with C₂H₄ containing gas mixtures with a composition comparable to the product stream of the oxidative coupling of methane process, as well as single gases up to a feed pressure of 30 bar. Furthermore, the permeances of the conducted gas mixture experiments were simulated. The results show a strong swelling influence of CO₂ on the used membrane depending on the CO₂ fugacity...
June 5, 2018: Membranes
https://www.readbyqxmd.com/read/29865242/tem-tomography-of-pores-with-application-to-computational-nanoscale-flows-in-nanoporous-silicon-nitride-npn
#18
Gregory Madejski, Kilean Lucas, Flavius C Pascut, Kevin F Webb, James L McGrath
Silicon nanomembrane technologies (NPN, pnc-Si, and others) have been used commercially as electron microscopy (EM) substrates, and as filters with nanometer-resolution size cut-offs. Combined with EM, these materials provide a platform for catching or suspending nanoscale-size structures for analysis. Usefully, the nanomembrane itself can be manufactured to achieve a variety of nanopore topographies. The size, shapes, and surfaces of nanopores will influence transport, fouling, sieving, and electrical behavior...
June 2, 2018: Membranes
https://www.readbyqxmd.com/read/29861485/low-energy-membrane-process-for-concentration-of-stick-water
#19
Jinxiang Zhou, Scott M Husson
This communication describes the application of forward osmosis (FO) to concentrate stick water, a nutrient-rich water byproduct of meat rendering operations. The objectives of the study were to carry out a set of batch FO runs in concentration mode to determine the maximum achievable stick water concentration and to perform a preliminary cost analysis for operating a FO/reverse osmosis membrane separation process for comparison to an evaporative concentration process. The study examined the roles of feed and draw solution stir rates, temperature, feed concentration, and draw solution ionic strength on flux using commercial cellulose triacetate membranes...
May 27, 2018: Membranes
https://www.readbyqxmd.com/read/29757953/performance-of-nanocomposite-membranes-containing-0d-to-2d-nanofillers-for-co%C3%A2-separation-a-review
#20
REVIEW
Saravanan Janakiram, Mahdi Ahmadi, Zhongde Dai, Luca Ansaloni, Liyuan Deng
Membrane technology has the potential to be an eco-friendly and energy-saving solution for the separation of CO₂ from different gaseous streams due to the lower cost and the superior manufacturing features. However, the performances of membranes made of conventional polymers are limited by the trade-off between the permeability and selectivity. Improving the membrane performance through the addition of nanofillers within the polymer matrix offers a promising strategy to achieve superior separation performance...
May 14, 2018: Membranes
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