Mass transfer simulation of ion separation by nanofiltration considering electrical and dielectrical effects

Fadaei, Farzad; Hoshyargar, Vahid; Shirazian, Saeed; Ashrafizadeh, Seyed Nezameddin

doi:10.1016/j.desal.2011.09.018

Cited by 54 publications

(22 citation statements)

References 28 publications

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“…Then it attracts more counter-ions into the solution inside the membrane pores. As such, the presence of more ions of similar charges around the target ion lowers its interaction energy with its image charge on the membrane surface [24].…”

mentioning

confidence: 99%

Graphene oxide for high-efficiency separation membranes: Role of electrostatic interactions

Liu

et al. 2016

Carbon

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Graphene oxide (GO) membranes represent a next generation of high-flux, ultra-lightweight and energy-efficient membranes for molecular and ionic separation in aqueous solution. In this work, we fabricate free-standing GO membranes with tunable thickness via facile vacuum filtration process. The effect of electrostatic interaction on the separation performance of GO membrane for organic dyes was demonstrated. It is observed that GO is negatively charged in a wide pH range of 1-12 and its surface charge density significantly varied with pH of aqueous solution. The electronegative GO membrane exhibits much higher rejection rate for electronegative organic dyes than that for electropositive molecules. Furthermore, the rejection rate and the strength of electrostatic interaction are directly related. In addition, the rejection behaviors of GO membranes for inorganic salts with different charge or ionic strength are explored as well. The experimental data are fitted well with the theoretical model based on Donnan equilibrium. Our results indicate that GO membranes could be promising candidate for water treatment and desalination application. And adjusting the surface charge density of GO and filtrated molecules is an effective way to achieve high separation performance (e.g. rejection rate).

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confidence: 99%

Graphene oxide for high-efficiency separation membranes: Role of electrostatic interactions

Liu

et al. 2016

Carbon

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“…The scaled model equations with the boundary conditions were solved using COMSOL Multiphysics software version 3.5a, which uses finite element method for numerical solution of differential equations. The finite element analysis is com-bined with adaptive meshing and error control using numerical solver of UMFPACK, which has been shown great application and accuracy in simulation of membrane contactors [1,7,9,10,13,[21][22][23][24]39]. Error reduction during numerical simulation is also obtained and shown in Fig.…”

Section: Numerical Solutionmentioning

confidence: 99%

“…Both physical and chemical absorption were simulated, and effect of process parameters on CO 2 removal have been investigated . However, some studies have been conducted on separation of liquid mixtures using membrane contactors . A few studies on flat‐sheet membrane contactors (FSMCs) have been carried out .…”

Section: Introductionmentioning

confidence: 99%

Separation of greenhouse gases from gas mixtures using nanoporous polymeric membranes

Mohammadi

Shirazian

Asadollahzadeh

et al. 2014

Polymer Engineering & Sci

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Removal of greenhouse gases from gas streams using porous membranes was carried out in this work. Theoretical studies were performed in terms of mathematical modeling and numerical simulation of CO2 capture in a flat‐sheet membrane contactor. Numerical simulation was performed using computational fluid dynamics (CFD) of mass and momentum transfer in the membrane module for laminar flow conditions. Physical absorption was considered in the simulations for absorption of CO2 in pure water. CO2 concentration distribution in the membrane module was determined through numerical solution of continuity equation coupled with the Navier‐Stokes equations. The modeling predictions indicated that the CO2 concentration difference is not appreciable in the membrane direction. Moreover, velocity distribution was determined in the liquid side of membrane contactor. CFD also represents a design and optimization tool for membrane gas separation processes. POLYM. ENG. SCI., 55:975–980, 2015. © 2014 Society of Plastics Engineers

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“…Great and irrefutable capabilities such as low investment cost, simple technology, high flexibility in system design and appropriate environmentally friendly characteristics have motivated numerous researchers for further investigations [7][8][9][10][11][12]. Various membrane separation processes have been designed and developed so far for purification/separation of gas and liquid mixtures [13][14][15][16][17][18][19].…”

Section: Introductionmentioning

confidence: 99%

Modification of polyethersulfone membrane using MWCNT-NH2 nanoparticles and its application in the separation of azeotropic solutions by means of pervaporation

et al. 2020

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In this study, functionalized multi-walled carbon nanotubes (MWCNT-NH 2) were synthesized as an additive for the preparation of mixed matrix membranes (MMMs) and then were investigated by FTIR and FE-SEM techniques. Polyether sulfone (PES) polymeric membrane modified with functionalized MWCNT-NH 2 carbon nanotubes was prepared by phase inversion method. The effect of MWCNT-NH 2 on the morphology and property of the PES membrane was evaluated using scanning electron microscopy. The flux, enrichment factor and swelling properties of modified membranes were also used to investigate the membranes performance. The results showed that the flux and enrichment factor in modified PES membrane containing 5 wt.% of functionalized MWCNT-NH 2 carbon nanotubes were obtained 1.2 L.m-2 h-1 and 3.3, respectively. The influence of methanol concentration on the flux and enrichment factor was investigated. The results corroborated that the flux didn't change significantly, while the enrichment factor was decreased.

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Mass transfer simulation of ion separation by nanofiltration considering electrical and dielectrical effects

Cited by 54 publications

References 28 publications

Graphene oxide for high-efficiency separation membranes: Role of electrostatic interactions

Graphene oxide for high-efficiency separation membranes: Role of electrostatic interactions

Separation of greenhouse gases from gas mixtures using nanoporous polymeric membranes

Modification of polyethersulfone membrane using MWCNT-NH2 nanoparticles and its application in the separation of azeotropic solutions by means of pervaporation

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