光催化
膜
聚偏氟乙烯
催化作用
降级(电信)
化学工程
材料科学
聚合
污染物
光降解
化学
有机化学
复合材料
聚合物
生物化学
电信
工程类
计算机科学
作者
Ruiyu Bao,Shaoqi Zhang,Ying Liu,Yang Rui-xia,Jianxin Xia,Hua Li
标识
DOI:10.1016/j.jpcs.2023.111463
摘要
Catalytic membrane combined with advanced oxidation processes (AOPs) could overcome the problem of secondary pollution that is caused by the difficulty of powder catalyst recovery. In this work, Fe-based metal-organic frameworks (MIL-101(Fe) or NH2-MIL-101(Fe)) were immobilized on polyvinylidene fluoride (PVDF) membrane to construct the photocatalytic membrane for organic pollutants degradation. Herein, the in-situ polymerization of PVDF/MIL-101(Fe) and PVDF/NH2-MIL-101(Fe) membranes were synthesized via non-solvent induced phase conversion method. The experimental results showed that all the catalytic membranes exhibit enhanced photocatalytic activity compared to pristine PVDF membrane. Among them, PVDF/NH2-MIL-101(Fe) (M3) showed the best photocatalytic activity. 90% of methylene blue (MB) was degraded by M3 under 90 min simulated solar irradiation. Moreover, the M3 has excellent stability, the degradation efficiency remained almost unchanged after repeated use 4 times. Free radical trapping experiments showed that superoxide radical (·O2−) is the main reactive species in the photocatalytic degradation of MB. Furthermore, the flux recovery ratio (FRR) of M3 was 83% after 10 min of simulated solar irradiation. MIL-101(Fe) and NH2-MIL-101(Fe) with excellent hydrophilicity and photocatalytic performance can not only endow the photocatalytic membranes with an excellent anti-fouling ability for pollutants but also endow the photocatalytic membranes with good self-cleaning ability for the degradation of the foulants deposited on the membrane. In this study, the PVDF/Fe-MILs membranes show excellent photocatalytic performance, stability and self-cleaning ability, which have broad application prospects in the field of water treatment.
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