Low Fouling Polyelectrolyte Layer-by-Layer Self-Assembled Membrane for High Performance Dye/Salt Fractionation: Sequence Effect of Self-Assembly

聚电解质 材料科学 Zeta电位 逐层 化学工程 聚偏氟乙烯 纳滤 苯乙烯 聚乙烯亚胺 自组装 图层(电子) 纳米技术 纳米颗粒 聚合物 复合材料 化学 共聚物 生物化学 工程类 转染 基因
作者
Urvashi S. Joshi,Soumen Samanta,Suresh K. Jewrajka
出处
期刊:ACS Applied Materials & Interfaces [American Chemical Society]
卷期号:16 (25): 32748-32761 被引量:8
标识
DOI:10.1021/acsami.4c06169
摘要

Layer-by-layer (LbL) self-assembly of oppositely charged polyelectrolytes (PEs) is usually performed on a conventional ultrafiltration base substrate (negative zeta potential) by depositing a cationic PE as a first layer. Herein, we report the facile and fast formation of high performance molecular selective membrane by the nonelectrostatic adsorption of anionic PE on the polyvinylidene fluoride (PVDF, zeta potential −17 mV) substrate followed by the electrostatic LbL assembly. Loose nanofiltration membranes have been prepared via both concentration-polarization (CP-LbL, under applied pressure) driven and conventional (C-LbL, dipping) LbL self-assembly. When the first layer is poly(styrene sodium) sulfonic acid, the LbL assembled membrane contains free −SO3– groups and exhibits higher rejection of Na2SO4 and lower rejection of MgCl2. The reversal of salt rejection occurs when the first layer is quaternized polyvinyl imidazole (PVIm-Me). The membrane (five layers) prepared by first depositing PStSO3Na shows higher rejection of several dyes (97.9 to >99.9%), higher NaCl to dye separation factor (52–1800), and higher dye antifouling performance as compared to the membrane prepared by first depositing PVIm-Me (97.5–99.5% dye rejection, separation factor ∼40–200). However, the C-LbL membrane requires a longer time of self-assembly or higher PE concentration to reach a performance close to the CP-LbL membranes. The membranes exhibit excellent pressure, pH (3–12), and salt (60 g L–1) stability. This work provides an insight for the construction of low fouling and high-performance membranes for the fractionation of dye and salt based on the LbL self-assembly sequence.
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