Thin film composite forward osmosis membranes based on thermally treated PAN hydrophilized PVDF electrospun nanofiber substrates for improved performance

Kallem, P and Gaur, R and Pandey, RP and Hasan, SW and Choi, H and Banat, F (2021) Thin film composite forward osmosis membranes based on thermally treated PAN hydrophilized PVDF electrospun nanofiber substrates for improved performance. In: Journal of Environmental Chemical Engineering, 9 (5).

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Abstract

The aim of this study was to explore the impact of thermally rolled polyvinylidene fluoride/polyacrylonitrile (PVDF/PAN) electrospun nanofibers (ESNF) as substrates to produce thin-film composite (TFC) forward osmosis (FO) membranes with better characteristics. Different loadings of PAN (0–10 wt%) were used to prepare PVDF/PAN ESNF substrates, and their surface morphology and structural properties were systematically studied. Before the deposition of the polyamide layer by interfacial polymerization, the ESNF substrates were subjected to continuous thermal rolling pretreatment to improve their mechanical stability. The water flux of 33.3 L/m2h and 42.3 L/m2h was achieved for the TFC-10 membrane with 10 wt% PAN blended PVDF ENSF substrate under FO and PRO modes, which was ~191% and ~188% higher than that of the TFC-0 membrane under FO and PRO orientations, respectively, using DI water as feed and 1 M NaCl as the draw solution. Moreover, the TFC-10 FO membrane showed improved selectivity, as indicated by the decrease in specific salt flux values (from 0.33 g/L of TFC-0–0.23 g/L for TFC-10), and a smaller structural parameter (221 µm) than the TFC-0 membrane, indicating that the influence of ICP can be reduced by the addition of PAN into PVDF ESNF substrate. © 2021 Elsevier Ltd

Item Type:	Journal Article
Publication:	Journal of Environmental Chemical Engineering
Publisher:	Elsevier Ltd
Additional Information:	The copyright for this article belongs to Elsevier Ltd.
Keywords:	Composite membranes; Fluorine compounds; Mechanical stability; Morphology; Osmosis; Osmosis membranes; Sodium chloride; Substrates; Surface morphology; Thin films, Electrospun nanofibers; Forward osmosis; Forward osmosis membranes; Internal concentration polarization; Membrane-based; Nanofiber membrane; P.V.D.F; Polyvinylidene fluorides; Thermal rolling pretreatment; Thin film composites, Nanofibers
Department/Centre:	Division of Chemical Sciences > Solid State & Structural Chemistry Unit
Date Deposited:	20 Feb 2023 11:40
Last Modified:	20 Feb 2023 11:40
URI:	https://eprints.iisc.ac.in/id/eprint/80435

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