New Antifouling Dual Iron-Based Photo-Fenton Catalytic Membrane Dedicated to Long-Term Treatment of Oils and Dyes

Combining the photo-Fenton catalytic reaction with membrane separation technology can effectively treat oils and dyes in water. However, single iron-based catalysts suffer from limited photogenerated carrier utilization and slow Fe/Fe redox reactions, leading to membrane contamination. In this study, iron oxyhydroxide and Prussian blue were grown on a PVDF membrane, optimizing electron transfer to improve the catalytic efficiency (the methylene blue degradation efficiency was nearly 50% in 10 min and the reaction rate constant was 0.094 min). The membrane flux for multicomponent oily wastewater reached 965.3 L·m h, with an over 99.9% dye removal rate. The flux of actual printing and dyeing wastewater after continuous filtration for 60 min reached 373.6 L·m h. Moreover, the catalytic and filtration mechanisms were explained in detail. The strategy provided in this study has certain practical application value in printing and dyeing wastewater treatment.