CATALYTIC ACTIVITY OF THE COMPOSITION SrBi4-уO7-z / ½у(BiO)2СО3 IN DECOMPOSITION OF METHYLENE BLUE DYE
Annotation
Results of studying the properties of the photo-catalytically active compositions SrBi4-уO7-z / ½у(BiO)2СО3, where y=1,2… 1,7, obtained by pyrolytic synthesis from organic precursor com-plexes of strontium and bismuth with sorbitol, are presented. The synthesized powder materials are shown to absorb light of the visible range up to 500 nm due to the presence of the narrow-band semiconductor SrBi4O7. The presence of the wide-band gap semiconductor (BiO)2СО3 provides effective separation of electron-hole pairs. The diffuse reflection spectra of the compositions differ from similar spectra of the mechanical mixture of these semiconductor phases of the same composition, which suggests the presence of a heterostructure in the semiconductor system. The catalytic particles synthesized at a temperature of 500 °C and containing 73 wt. % of SrBi4 уO7-z and 27 wt. % of (BiO)2СО3, have the greatest activity in me-thylene blue photo-decomposition. The possibility of controlling the optical properties and photocatalytic activity of the composition due to the joint formation of the phase of strontium bismuthate and the phase of bismuth oxycarbonate is demonstrated.
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