Composite ZnFe2O4/SrWO4 hollow microspheres as catalyst for high-performance photo-Fenton degradation

Abstract

Low degradation rate for a long degradation time and poor cycle stability caused by rapid recombination of generated electron-hole pairs are tough challenges for photo-Fenton degradation The unique microstructure catalyst can provide enough catalytic surface to prevent the recombination of electron-hole pairs and facilitate the barrier-free transport of active species. In addition, the special hollow microsphere structure can effectively accelerate the Rhodamine B (RhB) penetration and the photo-Fenton process. Introducing SrWO4 can increase oxygen vacancies and optimize the electronic structure of ZnFe2O4, thus enhancing electron transport and RhB degradation in the photo-Fenton process. This kind of catalytic material ZnFe2O4/SrWO4 (ZFO/SW) in the photo-Fenton process can effectively degrade the 99.18 % RhB dye only within 20 min with remarkable cycling stability. This work demonstrates the high efficiency of ZFO/SW as a photocatalyst and confirms the contribution of the current design concept to the development of photo-Fenton degradation materials.