Structure, dye degradation activity and stability of oxygen defective BaFeO3-x

Abstract

The structure, dye degradation activity and stability of oxygen defective BaFeO3-x, was investigated. The pure perovskite BaFeO3-x was synthesized at 700°C. With further increase in temperature, the oxygen loss occurred, and then the instability of BaFeO3-x was improved due to the change in crystal structure. BaFeO3-x can degrade methyl orange in the dark, and the degradation rate can be improved under visible light due to the optical property of BaFeO3-x. This degradation was caused by the transformation from Fe4+ to Fe3+ to some extent which was related with the structural transition of BaFeO3-x. So the reducibility of BaFeO3-x functions in dye degradation. The oxygen loss accelerated the structural transition and the photo-assisted degradation activity of BaFeO3-x. The instable Ba2+ also improves the instability of BaFeO3-x. ©2010 The Japan Institute of Metals.