Effect of oxygen vacancy variation on the photo-assisted degradation and structural phase transition of oxygen defective Ba(Fe,Co)O3−x

The different effect of oxygen vacancy variation on photo-assisted degradation effect and structural phase transition of oxygen defective Ba(Fe,Co)O3−x in dye degradation were investigated via comparative studies. The samples of perovskite BaFeO3−x and BaCoO3−x were synthesized at 700 °C by citrate sol–gel method. Samples synthesized above 700 °C show oxygen deficiency. With oxygen vacancy increasing, the BaFeO3−x becomes instable, whereas BaCoO3−x improves the stability. The instability is due to CO2 adsorption activity of oxygen vacancies, and then this may make negative effects on their photo-assisted degradation effect. So finally, the oxygen vacancies take different effects on photo-assisted degradation effect of Ba(Fe,Co)O3−x.