Preparation of highly stable ZnO/MOFs/polypropylene non-woven catalytic thin films by chitosan modification for organic wastewater treatment

The catalyst loading onto polymer films by pump-filtration can effectively solve the problem of catalyst separation and recycling, as well as expose more catalytically active sites. However, this method suffers from the disadvantage of poor catalyst attachment stability, which reduces the ability to catalyze the degradation of pollutants. In this paper, the high adhesion and film-forming properties of chitosan (CS) were utilized to modify the ZnO/NH 2 -MIL-88B (ZM) catalyst-loaded polypropylene non-woven (PP) composite membranes obtained by filtration, and CS/[ZM@PP] catalytic membranes with excellent catalyst adhesion stability and catalytic degradation performance were prepared. The results showed that the prepared CS/[ZM@PP]-X catalytic membranes significantly improved the recovery of the catalysts and possessed good catalytic performance, and the best-performed CS/[ZM@PP]-3 membrane could degrade more than 96.8 % of methylene blue (100 mL, 20 mg/L) within 60 min. In this paper, the effects of different factors on the catalyst recovery on the catalytic membrane were systematically investigated, and the prepared CS/[ZM@PP]-3 membrane can adapt to the complex aqueous environment, has excellent cycling stability, and still has more than 90 % degradation effect after 6 times of recycling, which has good potential for practical application.