Photocatalytic Activity and Photo-absorption of Plasma Sprayed TiO_2-10%Fe_3O_4 Coatings(Materials, Metallurgy & Weldability)

概要

論文の詳細を見る
To inhibit the rapid recombination of exited electrons and holes and improve the illumination absorption of the TiO_2 based photocatalyst during photocatalysis, one kind of novel TiO_2-10%Fe_3O_4 coating was prepared by plasma spraying. The effects of spraying parameters and the Fe_3O_4 additive to anatase TiO_2 powder on the microstructure, surface morphology and photo-absorption of plasma sprayed TiO_2 coatings were systematically studied. The photocatalytic activity of the sprayed coatings is evaluated through the photo-degradation of acetaldehyde. The UV-VIS-NIR, absorption spectra of the deposited coatings were obtained by using Shimazu UV-3100PC scanning spectrophotometer. The results showed that the TiO_2-10%Fe_3O_4 coatings consist of anatase TiO_2, rutile TiO_2, Fe_3O_4 and the FeTiO_3, and the content of anatase TiO_2 was estimated to be about 4%, which is lower than that of TiO_2 coatings of from 8% to 15%, With an increase in plasma arc power, the content of anatase TiO_2 in the coatings decreased. It was found that TiO_2 coatings deposited on mild steel can decompose acetaldehyde under the illumination of ultraviolet rays, and the degrading activity is improved with an increase in the content of anatase TiO_2 in the coatings. Moreover, the addition of Fe_3O_4 can enhance the photocatalytic activity for the higher light absorption and the formation of FeTiO_3 compound in the TiO_2-10%Fe_3O_4 coatings.
大阪大学の論文