Acid-resistant polyamide-sulphonamide nanofiltration membrane with positive charge for efficient removal of dyes/metal ions in acidic wastewater

[Display omitted] •A facile interface polymerization modification scheme is developed.•The introduction of PEI results in an unprecedented positive charge (IEP = 9.55) for the membrane.•The PSA group introduced by BDSC improves the acid-resistance of the membrane.•The doping of TMC greatly improves...

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Bibliographic Details
Published in:	Applied surface science Vol. 659; p. 159949
Main Authors:	Li, Zhenyu, Zhou, Xiaoji, Kang, Zeren, Zhang, Ganwei, Shen, Shusu, Bai, Renbi
Format:	Journal Article
Language:	English
Published:	Elsevier B.V 30-06-2024
Subjects:	Acid-resistant membrane Interfacial polymerization Nanofiltration Polyamide-sulfonamide Thin-film composite membrane Interfacial polymerization Polyamide-sulfonamide Nanofiltration Thin-film composite membrane Acid-resistant membrane
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Summary:	[Display omitted] •A facile interface polymerization modification scheme is developed.•The introduction of PEI results in an unprecedented positive charge (IEP = 9.55) for the membrane.•The PSA group introduced by BDSC improves the acid-resistance of the membrane.•The doping of TMC greatly improves the separation performance of traditional PSA membranes. Adjusting the TMC content to control the structural pore size of the membrane.•The modified membrane has good separation performance for dye/metal ions. The selection of separability and surface positive charge is of significant importance for treating acidic industrial wastewater with acid-resistant nanofiltration (NF) membranes. In this work, polyvinylidenefluoride (PVDF) flat membrane was used as the base membrane material, with polyethyleneimine (PEI) as the aqueous monomer and trimesoyl chloride (TMC)/benzene-1,3-disulfonyl chloride (BDSC) as the organic phase monomers, to prepare PEI-polyamide-sulphonamide (PASA) NF membrane through interfacial polymerization (IP). The influence of reaction conditions on membrane separation performance and corrosion resistance were studied, and the performance differences of the membrane under different ratios of TMC and BDSC were explored. PEI-PASA NF membrane was characterized by FTIR, XPS, SEM, contact angle tester, and mechanical strength tester. The results showed that the PEI-PASA NF membrane prepared under optimal conditions had a strong positive charge on the surface, with a water flux of 17.54 L·m−2·h−1 at 5 bar, and after static assessments in 10 % H2SO4 solution at 55 °C for 24 h, the methyl orange rejection remained kept over 95 %; after dynamic filtration in 1 % HCl for 120 h, the rejection performance of the membrane remained stable (FeCl3 96.88 %, CuCl2 93.72 %), indicating the potential application inharsh conditions, especially acid wastewater treatment.
ISSN:	0169-4332 1873-5584
DOI:	10.1016/j.apsusc.2024.159949