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.

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.Figure optionsDownload as PowerPoint slideHighlights
► The different effect of oxygen vacancy variation on the photo-assisted degradation effect and structure phase transition of oxygen defective Ba(Fe,Co)O3−x in methyl orange degradation was investigated via comparative studies.
► The perovskite BaFeO3−x was synthesized at 700 °C. With further increase in temperature, the amount of oxygen vacancies was increased, and then the instability of BaFeO3−x was improved. The instability is due to CO2 adsorption activity of oxygen vacancies, and then this may make negative effects on their photo-assisted degradation effect.
► Comparably, the perovskite BaCoO3−x was also synthesized at 700 °C. And with further increase in temperature, the amount of oxygen vacancies was also increased. But the instability of BaCoO3−x was decreased. So finally, the oxygen vacancies take different effects on photo-assisted degradation effect of Ba(Fe,Co)O3−x.
► The degradation effect and structure phase transition of Ba(Fe,Co)O3−x can be improved due to their optical property in visible light region.