Soyekwo Faizal, Liu Changkun, Zhao Lihua, Wen Hao, Huang Wei, Cai Chaojie, Kanagaraj Palsamy, Hu Yunxia
College of Chemistry and Environmental Engineering, Xili Campus , Shenzhen University , 1066 Xueyuan Boulevard , Nanshan District, Shenzhen 518071 , People's Republic of China.
State Key Laboratory of Separation Membranes and Membrane Processes, College of Materials Science and Engineering , Tianjin Polytechnic University , Xiqing District, Tianjin 300387 , People's Republic of China.
ACS Appl Mater Interfaces. 2019 Aug 21;11(33):30317-30331. doi: 10.1021/acsami.9b10208. Epub 2019 Aug 8.
Modifications to the surface of polymeric membranes to integrate supplemental properties like surface charge or catalytic activity are the cornerstone of the membrane process advancement to effectuate improvements in functionality and selectivity. Herein, a new approach is demonstrated to construct nanofiltration membranes with a metal-organic coordinated selective layer. Polyethylenimine (PEI) was integrated with phosphite linkages to form a characteristic aminophosphonate ester polymer based on the Kabachnik-Fields reaction, and a thin polymer layer was deposited on an ultrafiltration (UF) membrane to form the aminophosphonate networks surface-modified membranes. The aminophosphonate polymer interlayer facilitated the immobilization of metal cation moieties through the strong coordinative chemical bonding with the amino groups and phosphite moieties. Typically, the incorporated Fe strengthened the membranes' electropositivity leading to excellent heavy metal ion removal (>98%) and efficient organic dye separation (>99.8%). Meanwhile, the strategy also enabled the embedment of a photocatalytic layer comprising nanoneedle-like α-FeOOH that endowed the membrane with high photo-Fenton activity for organic dye mineralization. Subsequently, the α-FeOOH-embedded membrane afforded the photocatalytic self-cleaning potentiality for organic fouling mitigation. This contribution underscores the prospect of advancing the integration of metal-specific functionalities and the membrane process for advanced membrane technologies in water treatment.
对聚合物膜表面进行改性以整合诸如表面电荷或催化活性等补充特性，是推动膜工艺进步以实现功能和选择性提升的基石。在此，展示了一种构建具有金属有机配位选择性层的纳滤膜的新方法。基于卡巴契尼克-菲尔德反应，将聚乙烯亚胺（PEI）与亚磷酸酯键整合以形成一种特征性的氨基膦酸酯聚合物，并在超滤（UF）膜上沉积一层薄聚合物层以形成氨基膦酸网络表面改性膜。氨基膦酸聚合物中间层通过与氨基和亚磷酸酯部分的强配位化学键促进了金属阳离子部分的固定。通常，引入的铁增强了膜的正电性，从而实现了优异的重金属离子去除率（>98%）和高效的有机染料分离率（>99.8%）。同时，该策略还能够嵌入包含纳米针状α-FeOOH的光催化层，赋予膜对有机染料矿化的高光芬顿活性。随后，嵌入α-FeOOH的膜具有减轻有机污染的光催化自清洁潜力。这一贡献突出了推进金属特定功能与膜工艺整合以用于水处理先进膜技术的前景。
