A high stability GO nanofiltration membrane preparation by co-deposition and crosslinking polydopamine for rejecting dyes

Autor: Yulong Liu, Zhonghua Huang, Zhen Zhang, Xiaolu Lin, Qunxia Li, Yihang Zhu
Jazyk: angličtina
Rok vydání: 2022
Předmět:
Zdroj: Water Science and Technology, Vol 85, Iss 6, Pp 1783-1799 (2022)
Druh dokumentu: article
ISSN: 0273-1223
1996-9732
DOI: 10.2166/wst.2022.072
Popis: In order to improve the stability of nanofiltration membrane in separation and purification, a novel polyelectrolyte multilayer nanofiltration membrane was facilely prepared by co-deposition of polydopamine (PDA) and polyethyleneimine (PEI) on the polyethersulfone (PES) ultrafiltration membrane substrate, followed by immersing graphene oxide (GO) solution, and crosslinking PDA. The modified surfaces were characterized using scanning electron microscopy (SEM) and atomic force microscopy (AFM), water contact angle, their saline flux and ability to reject salt and dye were determined. The results also exhibited salt rejection ability as Na2SO4 > K2SO4 > MgSO4 > NaCl > KCl > MgCl2, suggesting the higher rejection of divalent anion. Also, the retention order of the dye by the GO modified membrane is DY86 > DB19 > AG27 > DY142 > DB56 > AR151 > VB5, indicating that the GO modified membrane has better rejection of negatively charged dyes as well as higher molecular weight dyes. Ethanol and hypochlorite resistance tests under different pH conditions showed the membranes coated GO enhanced stability in regard to salt rejection properties. Significantly, the anti-biological test confirmed the growth rate of microalgae on the GO introduced membrane was decreased greatly due to enhanced stability and lower roughness. HIGHLIGHTS This work has successfully prepared the (PDA@PEI/GO/PDA)/PES membrane by dip coating and chemical crosslinking.; The membrane has a good effect on the removal of divalent ions and better rejection of negatively charged dyes as well as higher molecular weight dyes.; The obtained membrane has high stability and excellent anti-biological pollution performance.;
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