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

Parashuram Kallem, Ruchi Gaur, Ravi P. Pandey, Shadi W. Hasan, Heechul Choi, Fawzi Banat

Research output: Contribution to journalArticlepeer-review

18 Scopus citations

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.

Original languageBritish English
Article number106240
JournalJournal of Environmental Chemical Engineering
Volume9
Issue number5
DOIs
StatePublished - Oct 2021

Keywords

  • Forward osmosis
  • Internal concentration polarization
  • Nanofiber membranes
  • Thermal rolling pretreatment
  • Thin-film composite

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