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Nano‐Modification of the Polyvinyl Alcohol/Organic Acid‐Modified Polyvinylidene Fluoride Thin‐Film Composite Membrane and Its Application in the Nanofiltration Process
Author(s) -
Abbasi Eskandary Nazanin,
Pakizeh Majid,
NamvarMahboub Mahdieh
Publication year - 2021
Publication title -
macromolecular materials and engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.913
H-Index - 96
eISSN - 1439-2054
pISSN - 1438-7492
DOI - 10.1002/mame.202000767
Subject(s) - permeance , polyvinylidene fluoride , polyvinyl alcohol , materials science , nanofiltration , citric acid , membrane , chemical engineering , thin film composite membrane , nanocomposite , surface modification , polymer chemistry , composite material , organic chemistry , polymer , chemistry , permeation , biochemistry , engineering , reverse osmosis
In this study, a novel thin‐film nanocomposite (TFN) membrane is developed consisting of a cross‐linked nano‐modified polyvinyl alcohol (PVA) selective layer on an organic acid‐modified polyvinylidene fluoride (PVDF) membrane. The nano‐modification of the PVA layer is performed via incorporating different amounts of the amine‐functionalized multiwalled carbon nanotubes (MWCNTs‐NH 2 ) into the PVA matrix. The effect of citric acid on the chemical structure and morphology of the PVDF support is also investigated. The performance of the resultant membranes in the nanofiltration (NF) of MgSO 4 and acid yellow‐17 aqueous solutions is also studied. The results indicate that the modification of the support with 0.5 wt% of citric acid increased the water permeance from 1.59 L m −2 h −1 bar −1 (LMH/bar) for PVA/PVDF to 4.49 LMH/bar for the PVA/modified PVDF membrane. Furthermore, the optimum value of MWCNT‐NH 2 (0.6 wt%) increases the permeance of the resultant TFN membrane to 4.94 LMH/bar while maintaining a high rejection. Interestingly, the incorporation of MWCNT‐NH 2 into the PVA layer and citric acid into the PVDF solution results in a membrane with the highest permeance of 6 LMH/bar.