PHOTOCATALYTIC PERFORMANCE OF PLASMA SPRAYED TiO_2-ZNFe_2O_4 COATINGS

摘要

A novel TiO_2-ZnFe_2O_4 coating is prepared by plasma spraying. The effects of spraying parameters and the composition of powders on the micro structure, surface morphology and photo-absorption of plasma sprayed coatings are studied. The photocatalytic efficiency of the as-sprayed coatings is evaluated through the photo mineralization of methylene blue. It was found that TiO_2 coatings can decompose methylene blue under the illumination of ultraviolet rays, and the degrading efficiency is improved with an increase in the content of FeTiO_3 in the coatings. However, the presence of large amount of ZnFe_2O_4 compound will substantially lower the photocatalytic efficiency of the TiO_2-ZnFe_2O_4 coatings for the unfavorable photo exdted electron-hole transfer process.