New AntifoulingDual Iron-Based Photo-Fenton CatalyticMembrane 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 Fe³⁺/Fe²⁺ 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^–1). The membrane flux for multicomponent oily wastewater reached 965.3 L·m^–2 h^–1, 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^–2 h^–1. 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.