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Abstract
SnO2 films were prepared by plasma electrolytic oxidation technology in solution containing different concentrations. The structure and photocatalytic activity of the films were characterised by X-ray diffraction, SEM, EDX, Brunauer–Emmett–Teller (BET) and UV-vis spectrophotometer. The result shows that films consisted of pure SnO2, but the grain size increased with the increase of
concentration. Porous and rough SnO2 films were formed on the substrate. The BET surface area increased with the increase of
concentration and reached its maximum when the concentration of
was 0·05M. The absorption edge of the films shifted from 370 to 408 nm when the concentration of
increased from 0·01 to 0·03M. Degradation of rhodamine indicated that photocatalytic activity of film formed in 0·03M
was highest due to its smaller grain, larger BET surface area and greater photon absorption.
Acknowledgement
The authors would gratefully acknowledge analytical and testing center of Huazhong University of Science and Technology for the tasks of test.