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The impact of end-group grafting on the chlorine resistance of semi-aromatic nanofiltration membranes

Authors： WANG Yuan1, LI Mengfei2, 3, WANG Zhiqiang3, YANG Shaoxia2, WANG Xiaomao3

Units： 1. Liyuan Water Design & Consultation Co., Ltd., Shenzhen 518001, China； 2. School of Water Conservancy and Hydropower Engineering, North China Electric Power University, Beijing 100084, China; 3. School of Environment, Tsinghua University, Beijing 100084, China

KeyWords： semi-aromatic nanofiltration membrane; chlorination; retention rate; grafting; reaction energy barrier

ClassificationCode：TQ028; TU991.2

year,volume(issue):pagination： 2024,44(6):45-54

Abstract：

Semi-aromatic polyamide nanofiltration membranes play a crucial role in drinking water treatment due to their high retention selectivity, large water flux, ease of integration, and scalability. However, their low resistance to active chlorine limits widespread application. This study investigated the effects of grafting with oxalyl chloride and sulfonyl chloride on enhancing membrane chlorine resistance. Grafting with oxalyl chloride decreased retention rates for xylose and Mg2+, albeit with slightly improved chlorine resistance in lab-made NFlab membranes. In addition, commercial NFH membranes exhibited significantly reduced chlorine resistance after oxalyl chloride grafting. Sulfonyl chloride grafting maintained the filtration performance of the original membrane and notably enhanced chlorine resistance in NFlab membranes. DFT calculations on membrane monomers revealed that the nitrogen in the amide bond was a primary reactive site for hypochlorous acid. Grafting led to minor changes in geometric configuration and reaction sites but increased the negative charge on the amide nitrogen. Transition state optimizations demonstrated that sulfonyl chloride grafting increased the reaction barrier for amide bond with hypochlorous acid, thereby improving membrane chlorine resistance.

Funds：

国家重点研发计划项目基金（2022YFC3202904）

AuthorIntro：

王源（1988-），男，山东聊城人，工程师，硕士，研究方向包括给排水工程设计、供水安全保障、水污染控制等

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