The preparation and Fenton degradation performance of in-situ grown isolated iron 4A-Fe/PES composite membrane
LU Jing1,2, ZHANG Han1,2, YE Hui1,2, SUN Jin-peng1,2, XIN Qing-ping1,2, ZHAO Li-zhi1,2, LIN Li-gang1,2, DING Xiao-li1,2, ZHANG Yu-zhong1,2, LI Hong1,2
1. State Key Laboratory of Separation Membranes and Membrane Processes, Tiangong University, Tianjin 300387, China; 2. School of Material Science and Engineering, Tiangong University, Tianjin 300387, China
Abstract：The integration of separation with Fenton oxidation aims to achieve efficient degradation of organic wastewater and continuous reuse of catalysts. In this study, 4A zeolite/PES mixed matrix membranes were prepared via non-solvent-induced phase separation and 4A-Fe/PES composite membranes were prepared by in situ growth of isolated iron species on the surface of 4A zeolite through an impregnation technique. Detailed characterization of membrane morphology and structure was conducted using SEM, FTIR, and XPS. The phenol degradation performance of this membrane was investigated under both static and dynamic conditions, with a comparative analysis of the H2O2 decomposition efficiency between 4A-Fe catalysts in powder and membrane forms. The results indicated that in situ growth of isolated iron species increased surface roughness on the zeolite. Under dynamic conditions, the degradation efficiency was significantly higher than in static conditions, reaching a 96.1% degradation rate within 1minute at pH 2, with 31.6mM H2O2 and an initial phenol concentration of 200mg/L. Catalytic kinetics revealed that, at pH 2, the degradation rate of the membrane form was 56times that of the powder form. Even After 5cycles, the membrane maintained a phenol degradation rate exceeding 90%.
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