Composite Anion Exchange Membranes with Antibacterial Properties for Desalination and Fluoride Ion Removal,ACS ES&T Water

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Composite Anion Exchange Membranes with Antibacterial Properties for Desalination and Fluoride Ion Removal
ACS ES&T Water ( IF 4.8 ) Pub Date : 2021-09-21 , DOI: 10.1021/acsestwater.1c00147
Sandip Pal _{1,

2} , Rakhi Mondal _{1,

2} , Arvind Kumar Singh Chandel _{1,

3} , Uma Chatterjee _{1,

2}

Affiliation

The contamination of fluoride ions in groundwater and membrane fouling due to the growth of bacteria in wastewater are serious problems. We report the preparation of a composite anion exchange membrane (AEM) with enhanced antimicrobial properties for water desalination and fluoride ions removal from water by electrodialysis (ED). The composite membranes were prepared by impregnating silver nanoparticles (AgNPs) in the N-alkylated terpolymer of poly(acrylonitrile), poly(n-butyl acrylate), and poly[(2-dimethyl aminoethyl) methacrylate], followed by cross-linking by the reaction with hydrazine hydrate. The key factors are the variation of alkyl chain length attached with −N(CH₃)₂– in the membrane matrix, optimizing the water uptake and impregnation of AgNPs. The presence of AgNPs in the AEMs was confirmed by UV–visible spectroscopy, transmission electron microscopy, and EDAX mapping. The incorporation of 0.03 wt % AgNPs in the AEMs increases 8.5–12.5% water uptake and 8–12% ionic conductivity. The representative M-C10/AgNPs membrane exhibited 0.72–0.74 kWh/kg power consumption and 96–95% current efficiency during the removal of fluoride ions (5.5–11 mg/L) from water containing NaCl (concentration: 2000 mg/L) by ED process. No detectable leaching of AgNPs was observed by continuous exposure of the composite AEMs in water at 50 °C for 15 days.

中文翻译：

用于海水淡化和氟离子去除的具有抗菌性能的复合阴离子交换膜

地下水中氟离子的污染和废水中细菌滋生导致的膜污染是严重的问题。我们报告了一种复合阴离子交换膜 (AEM) 的制备，该膜具有增强的抗菌性能，用于通过电渗析 (ED) 从水中脱盐和去除氟离子。通过将银纳米粒子 (AgNPs) 浸渍在聚 (丙烯腈)、聚 (丙烯酸正丁酯) 和聚 [(2-二甲基氨基乙基) 甲基丙烯酸酯]的N-烷基化三元共聚物中，然后通过交联制备复合膜。与水合肼反应。关键因素是与-N(CH ₃ ) ₂相连的烷基链长的变化– 在膜基质中，优化 AgNPs 的吸水和浸渍。通过紫外-可见光谱、透射电子显微镜和 EDAX 映射证实了 AEM 中 AgNPs 的存在。在 AEM 中加入 0.03 wt% 的 AgNPs 增加了 8.5-12.5% 的吸水率和 8-12% 的离子电导率。具有代表性的 M-C10/AgNPs 膜在从含有 NaCl（浓度：2000 mg/L）的水中去除氟离子（5.5-11 mg/L）的过程中表现出 0.72-0.74 kWh/kg 的功耗和 96-95% 的电流效率通过 ED 过程。通过将复合 AEM 在 50 °C 的水中连续暴露 15 天，未观察到可检测到的 AgNP 浸出。

更新日期：2021-10-08

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