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In（Ⅲ）-MOF改性聚酰胺复合正渗透膜的制备及其耐污染性能研究

作者：韩雪笠，王铎，汪锰

单位：中国海洋大学化学化工学院，山东青岛 266100

关键词：正渗透膜；聚酰胺复合膜；In（Ⅲ）-MOF；膜污染

DOI号：

分类号： TQ028.8

出版年,卷(期):页码： 2021,41(2):71-80

摘要：

在众多的改善正渗透复合膜性能的方法中，添加金属有机骨架（MOFs）材料形成聚酰胺复合膜是操作过程简单且膜性能提升程度较大的方法。本文首先将一定量的金属盐In(NO3)3·6H2O与三齿羧酸配体H3CTTA溶解于N，N-二甲基甲酰胺中，利用溶剂热法制备得到In（Ⅲ）-MOF晶体，即BUT-172；然后通过界面聚合方法将制备的MOF颗粒添加到聚酰胺活性分离层中，得到BUT-172改性的聚酰胺复合正渗透膜。并进一步研究了不同比例的BUT-172颗粒添加到油相溶液中对聚酰胺复合正渗透膜结构和性能的影响。结果表明，BUT-172颗粒的引入为水分子的扩散提供了额外的通道，使得改性聚酰胺复合正渗透膜的水通量获得了极大地提升，且当添加量为0.04wt% 时，改性膜在拥有较高水通量的同时具有低的盐水比。以腐殖酸进行的耐污染性研究表明，改性膜具有更好的耐污染性且污染后的膜通过简单清洗即可恢复性能。

Adding Metal-Organic Framework (MOFs) to form polyamide composite membrane is a simple process to improve the performance of forward osmosis membranes greatly. In this paper，a certain amount of the metal salt In(NO3)3·6H2O and tridentate carboxylic acid ligands H3CTTA was dissolved in N, N - dimethyl formamide to get In(Ⅲ)-MOF (BUT - 172) crystal by the solvothermal method；Then，the prepared MOF particles were added to the polyamide active separation layer by interfacial polymerization，and the modified TFC- FO membrane was obtained. In addition，the effects of different concentration of BUT-172 particles on the structure and properties were also studied. The results showed that the incorporation of BUT-172 particles provided additional channels for the diffusion of water molecules，which greatly improved the water flux of the modified TFC-FO membrane. Moreover，when the BUT-172 concentration was 0.04wt%，the modified membrane had a higher water flux and a lower salt water ratio. The study on pollution resistance of humic acid showed that the modified membrane had better pollution resistance and the performance of the polluted membrane can be recovered by simple cleaning.

基金项目：

：国家自然科学基金项目（21576249）

作者简介：

韩雪笠（1995-），女，山东滨州人，在读硕士，从事功能膜材料的制备研究，联系电话：0532-66786513

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