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Separation and Purification Technology

Separation and Purification Technology

IF: 8.09
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Highly hydrophilic loose nanofiltration membrane based on a novel diaminobenzamide monomer for efficient dye/salt separation

Published:10 December 2024 DOI: 10.1016/j.seppur.2024.131005
Bo Wu, Shao-Lu Li, Niamat Ullah, Qiyu Duan, Mengfan Wang, Ning Yu, Genghao Gong, Yunxia Hu

Abstract

Loose nanofiltration (LNF) membranes with high dyes/salts selectivity and superior anti-fouling performance are urgently needed for treating textile wastewater. Herein, we prepared a polyamide (PA) LNF membrane through reaction of monomer 3,5-diaminobenzamide (3,5-DABA) with trimesoyl chloride (TMC). The presence of an electron-withdrawing and hydrophilic formamide substituent group on the 3,5-DABA monomer not only enhanced the membrane surface hydrophilicity, but also significantly influenced the IP film forming reaction process, leading to a looser and smoother separation layer. The optimized 3,5-DABA/TMC membrane exhibited a high water permeance of 24.62 LMH bar?1 and?>?99?% retention for anionic dyes such as Eriochrome Black T (EBT), Methyl blue (MB), and Congo red (CR), as well as 97.5?% rejection for Acid Fuchsin (AF). Simultaneously, it also showed super-low (<5 %) rejection for monovalent anionic salts, achieving a superior selectivity (172.8) for CR/NaCl mixtures. Additionally, the membrane showed superior anti-fouling performance due to its negatively charged, hydrophilic, and relatively smooth surface. These results confirm its potential for saline textile wastewater treatment. This study presents a novel monomer candidate to fabricate outstanding LNF membranes.

Substances (3)

Materials
Procduct Name CAS Molecular Formula Supplier Price
4-Dimethylaminopyridine 1122-58-3 C7H10N2 1239 suppliers $6.00-$5370.00
Sodium dodecyl sulfate 151-21-3 C12H26O4S.Na 1124 suppliers $6.00-$3140.00
Congo Red 573-58-0 C32H22N6Na2O6S2 455 suppliers $6.00-$700.00

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