Magnetic recyclable MnFe2O4/CeO2/SnS2 ternary nano-photocatalyst for photo-Fenton degradation

摘要

The novel MnFe2O4/CeO2/SnS2 (1:0.2:0.5, 1:0.2:1, 1:0.2:1.5) nano-photocatalysts with magnetic recyclability were prepared via a facile hydrothermal route. MnFe2O4 and CeO2 nanoparticles are decorated onto SnS2 flowers to fabricate a MnFe2O4/CeO2/SnS2 ternary heterojunction. SnS2 is an excellent connector between MnFe2O4 and CeO2 in synthesized MnFe2O4/CeO2/SnS2 composite with a suitable band gap to accelerate methylene blue (MB) of photodegradation, which is attributed to its highly efficient separation of photogenerated electron-hole pairs. Compared with pure MnFe2O4, the photo-Fenton degradation of the MnFe2O4/CeO2/SnS2 composites significantly enhance in the presence of H2O2. Notably, the MnFe2O4/CeO2/SnS2 (1:0.2:1) composite displays a slightly decreased charge-transfer resistance and an increased photocurrent density with good cycling stability after five runs, exhibiting the excellent photocatalytic and photo-Fenton performance under simulated sunlight. Consequently, the photo-Fenton mechanism of MnFe2O4/CeO2/SnS2 is explained on the basis of coexistence of Mn2+/Mn3+ and Fe3+/Fe2+ redox couples. Meanwhile, (OH)-O-center dot is the main active specie.