Zwitterionic metal-organic frameworks modified polyamide membranes with enhanced water flux and antifouling capacity
Zwitterionic metal-organic frameworks modified polyamide membranes with enhanced water flux and antifouling capacity
复制标题
两性离子金属有机框架改性聚酰胺膜具有增强的水通量和防污能力
DOI：
10.1016/j.chemosphere.2022.136684
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发表时间：
2022
期刊：
影响因子：
8.8
通讯作者：
Li Cao
中科院分区：
文献类型：
--
作者：
Chongbin Wang;Hongchao Wang;Yongsheng Li;Yuanyuan Feng;Zhong qiu Liu;Tian Sheng Zhao;Li Cao
抗污染性能被认为是聚酰胺（PA）复合纳滤膜在实际应用中的关键参数。本研究首次将两性离子聚合物修饰到MOFs表面，制备了一种表面两性化的金属有机骨架材料Z-MIL-101（Cr）。随后，通过界面聚合技术将Z-MIL-101（Cr）纳米颗粒与有机基质混合，制备了一种新型的MOFS基混合膜。最佳的杂化膜具有26 L m-2 h-1bar-1的高水渗透性，比原始PA膜高2.1倍，而Na 2SO 4的保留率仍然保持在相当高的值93%。水烟道的显著增加可归因于Z-MIL-101（Cr）产生的水通道的存在。更重要的是，杂化膜的亲水性比纯PA好得多，这是由于在两性离子基团周围形成了超亲水性液体层。MOFs的杂化结构与修饰的两性离子聚合物的优异的杂化性能相结合，有效地改善了分离性能和可渗透性，这使得这些杂化膜在水净化方面具有前景。
Antifouling properties are considered to be crucial parameter to polyamide (PA) composite nanofiltration (NF) membranes for practical applications. In this study, an antifouling material, surface zwitterionization of Metal-organic frameworks (Z-MIL-101 (Cr)) was firstly prepared by decorating zwitterionic polymer onto the MOFs surface. Subsequently, a novel type of MOFs-based hybrid membranes were fabricated via mixing the Z-MIL-101 (Cr) nanoparticle with the organic matrix by interfacial polymerization technique. The most optimal hybrid membrane had a high water permeation of 26 L m−2h−1bar−1, which was 2.1 times higher than that pristine PA membrane, while the retention for Na2SO4was still kept at a considerably high value of 93%. The significant increased water flue can attribute to the existence of water channels generated by the Z-MIL-101 (Cr). More important, the antifouling property of the hybrid membrane was much better than that pristine PA, which was due to the formation of superhydrophilic liquid layer surrounding the zwitterionic groups. The combination of the micropore structure of the MOFs and the excellent antifouling properties of the decorated zwitterionic polymer effectively improved separation performances and antifouling ability, which makes these hybrid membranes promising for water purification.