Recent advances in nanomaterial-incorporated nanocomposite membranes for organic solvent nanofiltration

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Journal Article
Separation and Purification Technology, 2021, 268, pp. 1-29
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1-s2.0-S1383586621003695-main.pdf9.8 MB
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Recently, there is an increasing interest on organic solvent nanofiltration (OSN) for the separation and recovery of organic solvents due to the high energy consumption and the high cost involved in conventional organic solvent recovery processes. Conventional organic solvent recovery processes often involve, thermal phase separation processes such as distillation and deactivation which utilizes varying boiling points of organic solvents. Owing to such issues, pressure driven, membrane-based OSN process attracted significant attention as a low energy and low-cost alternative approach for the recovery of the organic solvents which utilizes the molecular size sieving effect via varying membrane pore sizes. However, the low solvent permeate flux, low stabilities of polymeric membranes under organic solvents and controlling the membrane properties suited for separation of various organic solvents/solutes has risen as significant challenges in implementing OSN membranes/process in practical applications. To overcome such challenges, chemically stable nanomaterials have been used as an additive material in nanocomposite membrane fabrication for OSN applications. This paper comprehensively review the nanomaterial-based OSN nanocomposite membranes based on different types of nanofillers used and the different fabrication approaches. Besides, this paper also discusses the major issues involved in different nanocomposite membrane fabrication and possible solutions for the issues involved. Moreover, the challenges and future prospective are also provided to present the current research gaps and to further develop nanomaterial-based OSN membranes for practical application.
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