Polyamide thin film nanocomposite membrane containing polydopamine modified ZIF-8 for nanofiltration
Polyamide thin film nanocomposite membrane containing polydopamine modified ZIF-8 for nanofiltration
复制标题
含聚多巴胺改性 ZIF-8 的纳滤用聚酰胺薄膜纳米复合膜
DOI：
10.1016/j.colsurfa.2020.125971
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发表时间：
2020-12
期刊：
影响因子：
--
通讯作者：
Shi Yawei
中科院分区：
文献类型：
--
作者：
Zhao Bin;Long Xingli;Wang Hongli;Wang Liang;Qian Yiran;Zhang Hongwei;Yang Chenyang;Zhang Zhaohui;Li Junjing;Ma Cong;Shi Yawei
为了使咪唑骨架分子筛（ZIF-8）更好地分散于水溶液中，制备薄膜纳米复合（TFN）膜，采用聚多巴胺改性ZIF-8制备亲水性ZIF-8。在界面聚合（IP）反应之后，PDA-ZIF-8纳米颗粒均匀地包埋在聚酰胺（PA）基质中。所得到的PA层表现出更好的亲水性，更高的表面粗糙度，和更少的交联度。因此，与没有纳米填料的薄膜复合（TFC）膜相比，水渗透性增加了66%。此外，由于PDA-ZIF-8的相容性改善以及膜表面带更强的负电荷，SO 42 −的保留略有增强，罗丹明B的保留保持良好。通过PDA对ZIF-8进行亲水改性是改善其与PA聚合物的相容性的简便方法，并且所得的TFN膜表现出提高的水渗透性而不损害其选择性。
In order to better disperse zeolitic imidazolate framework-8 (ZIF-8) in aqueous solution for thin film nanocomposite (TFN) membrane fabrication, hydrophilic ZIF-8 was prepared by polydopamine modification. After the interfacial polymerization (IP) reaction, PDA-ZIF-8 nanoparticles were evenly entrapped in the polyamide (PA) matrix. The as-obtained PA layer demonstrated better hydrophilicity, higher surface roughness, and less cross-linking degree. Therefore, the water permeability increased by 66 % compared to the thin film composite (TFC) membrane without nanofillers. Moreover, due to the improved compatibility of PDA-ZIF-8 as well as the stronger negatively charged membrane surface, the retention of SO42−was slightly enhanced, and the retention of rhodamine B was well maintained. The hydrophilic modification of ZIF-8 by PDA was a facile method to improve its compatibility with the PA polymer, and the resultant TFN membrane demonstrated elevated water permeability without compromising its selectivity.
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