Surface modification of PTMSP membranes by plasma treatment: Asymmetry of transport in organic solvent nanofiltration

Волков, А. В.; Tsarkov, Sergey; Gilman, A. B.; Khotimsky, V. S.; Roldughin, V. I.; Волков, В. В.

doi:10.1016/j.cis.2014.11.005

Cited by 37 publications

(19 citation statements)

References 74 publications

(95 reference statements)

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“…Solvent and solutes have affinity toward each other rather than the membrane and transport occur through coupled diffusion. In a recent study by Volkov et al the strong coupling effect between the solvent and solute transport was reported in OSN membranes.…”

Section: Resultsmentioning

confidence: 90%

Application of organic solvent nanofiltration for microalgae extract concentration

Lopresto

Darvishmanesh

Ehsanzadeh

et al. 2016

Biofuels Bioprod Bioref

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Microalgae lipids hold significant potential as a biofuel feedstock. The high‐lipid content found in some species of microalgae is a major superiority over other sources. Furthermore, they have a high production rate record per area and survive in areas not already used for food production. This study considered the use of an integrated membrane process for oil extraction from microalgae. Different technologies were explored for laboratory‐scale microalgae oil extraction, including the use of organic solvents, but they would require a further purification. Organic solvent nanofiltration (ONF) was employed for separation of solvent from oil: the solvent passed through the dense polymeric membrane while oil molecules were rejected by the membrane. Since different organic solvents were used in literature for oil extraction from microalgae, this study examined different oil‐solvent mixtures and their separation by commercial hydrophobic and hydrophilic membranes. Experimental results showed that the new generation of ONF membranes has a superior performance compared to the previously used membranes. Based on rejection tests of oil in ethanol, isopropanol, and acetone, the applicability of the new commercial membranes for solvent recovery was demonstrated. Hydrophobic membranes had superior performances when oil was extracted using n‐hexane as the solvent, whereas methanol miscella had the highest flux and rejection in hydrophilic membranes. Finally, the conventional and hybrid approach were simulated in Aspen. The approach including nanofiltration saves around 97% of the energy requirements for the separation. In terms of economic costs, the conventional alternative is slightly more convenient in a short‐term situation. © 2016 Society of Chemical Industry and John Wiley & Sons, Ltd

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Section: Resultsmentioning

confidence: 90%

Application of organic solvent nanofiltration for microalgae extract concentration

Lopresto

Darvishmanesh

Ehsanzadeh

et al. 2016

Biofuels Bioprod Bioref

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“…The current studies of NF performance improvement are commonly centered on the novel monomers development [17], the modification of functional layer [18,19] and the properties enhancement of support membranes such as mechanical properties, hydrophilicity [5], and etc. Compared with the development of novel monomer and the properties enhancement of support membranes, the modification of the functional layer is believed to be the simplest and the most practical way to overcome the drawbacks of current NF membranes.…”

Section: Introductionmentioning

confidence: 99%

“…Compared with the development of novel monomer and the properties enhancement of support membranes, the modification of the functional layer is believed to be the simplest and the most practical way to overcome the drawbacks of current NF membranes. The modification is usually implemented by the introduction of functional groups such as the hydrophilic groups [20], amphiphilic copolymers, zwitterionized groups [21] or the nanospheres [22] through the surface grafting method (plasma treatment [18,23], preoxidation method [19], solvent modifications [24], UV grafting [25,26], ion implantation [27]), surface coating [28] and blending method [22].…”

Section: Introductionmentioning

confidence: 99%

Effects of zinc oxide Nanospheres on the Separation performance of Hollow fiber poly(piperazine-amide) composite nanofiltration membranes

Shi

Zhu

et al. 2016

Fibers Polym

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The inner-skinned hollow fiber composite (HFC) nanofiltration (NF) membranes were modified through the incorporation of zinc oxide nanospheres in the poly(piperazine amide) layer during the interfacial polymerization (IP) process. The active layer was coated on the inner surface of polysulfone (PSF) support membrane via Two-way coating technique. The chemical composition and morphology of HFC membrane surface were evaluated through the Attenuated Total Reflectance Fourier Transform Infrared spectroscopy (ATR-FTIR) and Scanning Electronic Microscopy (SEM). The effects of zinc oxide (ZnO) nanospheres on membrane performance including the hydrophilicity, separation performance and chlorine resistance were investigated. The results showed that the modified HFC membranes with low concentration ZnO nanospheres (1.5 wt%) had an improved flux (33.8 L·m -2 ·h -1 ) meanwhile the salt rejection of MgSO 4was well maintained (92.2 %) at 0.7 MPa. The introduction of ZnO also dramatically enhanced the chloride resistance of composite NF membranes in comparison with the control membranes prepared without ZnO. Therefore, nano metallic oxide like ZnO could be considered as a potential modifier to improve the performance of HFC nanofiltration membranes.

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“…Besides permeability and selectivity, the chemical stability of the membranes is of great importance for such applications. In SRNF, both polymeric and inorganic membranes are used with molecular weight cut-offs in the range of 200-1000 Da [9,[14][15][16][17][18][19].…”

Section: Introductionmentioning

confidence: 99%

UV-cured polysulfone-based membranes: Effect of co-solvent addition and evaporation process on membrane morphology and SRNF performance

Altun

Rémigy

Vankelecom

2017

Journal of Membrane Science

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This is an author's version published in: http://oatao.univ-toulouse.fr/20454 To cite this version:Altun, Veysi and Remigy, Jean-Christophe and Vankelecom, Ivo F.J. UV-cured polysulfone-based membranes: Effect of co-solvent addition and evaporation process on membrane morphology and A B S T R A C T Membranes consisting of a semi-interpenetrating network of polysulfone (PSU) and cross-linked polyacrylate were synthesized via non-solvent induced phase inversion followed by UV-treatment. Tetrahydrofuran (THF) or 1,4-dioxane (DIO) was added as co-solvent to the N,N-dimethylformamide (DMF)-based polymer solutions and cast films were subjected to evaporation prior to coagulation. Effects of synthesis variables on the membrane morphology and solvent resistant nanofiltration (SRNF) performance were investigated by using a Rose Bengal solution in isopropanol. By increasing the evaporation time from 0 to 100 s for the membranes prepared with THF and DIO as co-solvent respectively, rejections increased from 65.3% to 94.2% and 60.1-89.1%, while permeances decreased from 0.29 to 0.01 l/m 2 h bar and 0.41-0.08 l/m 2 h bar. A similar effect was observed when the co-solvent/solvent ratio was increased from 0/100 to 100/0: rejections increased from 63.1% to 94.9% and 59.2-90.6%, while permeances decreased from 0.43 to 0.01 l/m 2 h bar for THF-based membranes and to 0.07 l/m 2 h bar for DIO-based membranes respectively. A post-treatment was performed to increase the flux by immersing UV-cured PSU-based films in DMF for 48 h. The resultant membranes showed higher permeances and lower rejections, making them especially useful as potential candidates for stable supports to apply selective layers upon, such as e.g. in thin film composite (TFC) membranes. As observed in scanning electron microscopy, higher evaporation times and lower initial co-solvent concentrations resulted in less or even no macrovoids.

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Surface modification of PTMSP membranes by plasma treatment: Asymmetry of transport in organic solvent nanofiltration

Cited by 37 publications

References 74 publications

Application of organic solvent nanofiltration for microalgae extract concentration

Application of organic solvent nanofiltration for microalgae extract concentration

Effects of zinc oxide Nanospheres on the Separation performance of Hollow fiber poly(piperazine-amide) composite nanofiltration membranes

UV-cured polysulfone-based membranes: Effect of co-solvent addition and evaporation process on membrane morphology and SRNF performance

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