CMC/PPy/PVDF复合膜的制备及其染料/盐分离性能  

Preparation of CMC/PPy/PVDF composite membrane and its dye/salt separation performance

作　　者：唐峰玲 杨景 张子旭 刘子天 马文松 程琦 杨旭 徐美娜 王启莹 尚慧洋 吴昊 何瑷衫 林立刚 TANG Fengling;YANG Jing;ZHANG Zixu;LIUZitian;MA Wensong;CHENGQi;YANG Xu;XUMeina;WANG Qiying;SHANG Huiyang;WU Hao;HE Aishan;LIN Ligang(State Key Laboratory of Separation Membranes and Membrane Processes,School of Materials Science and Engineering,Tiangong University,Tianjin 300387,China)

机构地区：[1]天津工业大学材料科学与工程学院,省部共建分离膜与膜过程国家重点实验室,天津300387

出　　处：《膜科学与技术》2024年第5期117-124,共8页Membrane Science and Technology

基　　金：国家自然科学基金项目(22078244);全国大学生创新创业训练项目(202310058013)。

摘　　要：在印染废水处理中,如何高效地分离染料/盐废水是一个亟待解决的问题.为实现高效染料/盐选择性分离及提高膜的通量,以聚偏氟乙烯(PVDF)为基膜,在单宁酸辅助下羧甲基纤维素(CMC)凝胶通过层层交联的方式构建稳定的凝胶层以减少膜污染、提高膜通量,然后在其表面聚合聚吡咯以制备复合膜,进一步提高截留率.重点研究了膜的微观结构、亲水性、荷电性以及染料/盐分离特性及运行稳定性.结果表明,该膜对5种典型染料均具有较高的截留率(>99%)且对纯水保持较高的通量[91.7 L/(m^(2)·h)],膜还具有良好的染料/盐分离性能(染料截留率>99%,盐截留率<6%).In dyeing and printing wastewater treatment,how to efficiently separate dye/salt wastewater is an urgent problem.This project is to achieve efficient dye/salt selective separation and improve the membrane flux.Using polyvinylidene fluoride(PVDF)as the base membrane,carboxymethylcellulose(CMC)gel assisted by tannic acid was used to construct a stable gel layer through layer-by-layer cross-linking in order to reduce membrane contamination and improve the membrane flux,and then polymerised with polypyrrole on the surface of it in order to prepare a composite membrane to further improve the rejection rate.The microstructure,hydrophilicity,electrophilicity,dye/salt separation and operational stability of the membrane were investigated.The results showed that the membrane has high rejection of five typical dyes(>99%)and high flux to pure water[91.7 L/(m^(2)·h)],and also has good dye/salt separation performance(dye rejection>99%,salt rejection<6%).

关 键 词：水凝胶 聚吡咯 膜分离 染料/盐分离 

分 类 号：TQ028.8[化学工程]