膜科学与技术

氟化改性ZIF-8-90杂化膜的制备及其渗透汽化脱醇研究

作者：于汾，朱腾阳，王艳

单位：华中科技大学，化学与化工学院，武汉 430070

关键词： Pebax 2533；氟化改性；ZIF-8-90；杂化膜；渗透汽化脱醇

出版年,卷(期):页码： 2020,40(1):23-30

摘要：

有机-无机杂化膜是目前膜分离研究的热点，但是有机基体-无机粒子之间的界面缺陷是目前面临的重要问题。本文使用五氟苯胺改性ZIF-8-90粒子（F-ZIF-8-90），为了改善有机基体-ZIF-8-90之间的界面缺陷和提高ZIF-8-90的疏水性，红外谱图证实了五氟苯胺的成功接枝。以F-ZIF-8-90为填充料，制备了一系列Pebax 2533/F-ZIF-8-90杂化膜，考察了杂化膜的形貌结构、疏水性能和渗透汽化性能。研究结果表明，F-ZIF-8-90填充量为5 wt%时，70 ℃测试条件下杂化膜对质量分数5 wt%乙醇水溶液的渗透通量最高可达201.5 g/m2 h，对应的分离因子为5.4. 相比较纯Pebax 2355膜，渗透通量和分离因子分别提高了24.1 %和151.9 %，打破了渗透通量和分离因子相互制约的效应。

Polymer-inorganic particle hybrid membranes are currently the hotspot of membrane separation research, but the interface defect between polymeric matrix and inorganic particle are a challenging issue. In this work, ZIF-8-90 particles were modified with pentafluoroaniline to eliminate the interface defects between polymeric matrix and ZIF-8-90 and improve the hydrophobicity of ZIF-8-90 simultaneously. FTIR characterization confirmed the successful grafting of pentafluoroaniline onto ZIF-8-90. A series of Pebax 2533/F-ZIF-8-90 hybrid membranes were prepared by introducing F-ZIF-8-90 into Pebax 2533 matrix. The morphology, hydrophobicity, and pervaporation performance of the hybrid membranes were investigated. The results showed that when the filling amount of F-ZIF-8-90 was 5 wt%, the permeation flux and the separation factor of the hybrid membrane can reach 201.5 g/m2 h and 5.4 respectively, at 70 °C with 5 wt% ethanol aqueous solution. Compared to pure Pebax 2355 membrane, the permeation flux and separation factor of P/FZ-5 hybrid membrane increased by 24.1 % and 151.9 %, respectively, breaking the trade-off effect between the permeation flux and the separation factor.

共同一作简介：于汾 (1993-)，女，河南周口人，硕士，主要从事疏水膜制备与改性工作；朱腾阳 (1991-)，男，山东聊城人，博士，主要从事渗透汽化脱醇膜的研究。*通讯作者，E-mail: wangyan@hust.edu.cn

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