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基于氨基酸MOF的共混超滤膜制备及性能研究

作者：张晓灿，马慧晓，朱梓源

单位：中国石油大学（北京）理学院,油气光学探测技术北京市重点实验室，北京 102249

关键词：金属有机框架；膜污染；PSf超滤膜；抗污性能

DOI号：

分类号： TQ028.3+8

出版年,卷(期):页码： 2023,43(4):75-83

摘要：

亲水化改性是解决聚砜（PSf）膜污染问题的重要策略之一，而将PSf与亲水性材料直接共混是较为高效的途径。MIP-202是亲水性多孔材料，可用于改善超滤膜的防污性能。本研究以N,N-二甲基乙酰胺（DMAc）为溶剂，PVP为致孔剂，采用非溶剂致相分离法（NIPS）制备了PSf/MIP-202共混超滤膜，研究了MIP-202的含量对PSf超滤膜结构与性能的影响。通过XRD、SEM、FTIR、接触角、水通量、孔隙率和平均孔径等测试手段对共混改性膜进行表征测试。结果表明，在MIP-202添加剂含量为4 %时，膜的综合性能最优，共混超滤膜的水接触角从81 °降低至70 °，纯水通量达到550 L/(m2·h)，是PSf原膜纯水通量[300 L/(m2·h)]的1.8 倍。该膜对牛血清白蛋白保持了95 %以上的高截留率，通量恢复率从42 %增加到75 %，抗污染性能较PSf原膜明显提高。

Hydrophilic modification is one of the most important strategies to enhance antifouling properties of polysulfone (PSf) membranes. Blending of PSf with hydrophilic material MIP-202 is an efficient way. The polysulfone (PSf)/MIP-202 mixed matrix membrane was prepared via non solvent induced phase separation (NIPS) using N,N-dimethylacetamide (DMAc) as the solvent and PVP as the pore forming agent. The effect of MIP-202 content on the structure and performance of PSf ultrafiltration membrane was studied. The composite membranes were characterized by XRD, SEM and FTIR, and water contact angle, water flux, porosity and average pore size were also analyzed. The composite membrane exhibited optimum properties with 4% MIP-202, and the water contact angle decreased from 81° to 70 °. The maximum pure water flux was 550 L/(m2·h) with BSA rejection up to 95%, and it was 1.8 times of the DI water flux of the pristine membrane [300 L/(m2·h)]. The flux recovery ratio increased from 42 % to 75 %, and the antifouling performance was significantly improved compared with that of pristine PSf membrane.

基金项目：

国家自然科学基金（22105225），中国石油大学（北京）校级自主科研基金（2462022YXZZ00 7）

作者简介：

张晓灿（1982-），女，籍贯河南新乡，副教授，博士，主要从事高分子复合膜材料的研究，E-mail：xiaocan.zhang@cup.edu.cn

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