Study on photocatalytic degradation of methylene blue by silver doped titanium dioxide
Silver doped titanium dioxide catalyst(Ag/TiO2)was successfully prepared by roasting method in order to enhance the ability of Ag/TiO2 to photocatalytic degradation of organic dyes under visible light.Methylene blue was used as the target material to investigate the effects of degradation time,light source,pH,catalyst dosage,H2O2 addition amount on the photocatalytic performance.Scanning electron microscope(SEM),energy dispersive spec-trometer(EDS)and X-ray diffractometer(XRD)were used for its characterization.The results show that when the photodegradation time is 150 min,pH is 9.2 and the dosage of Ag/TiO2 is 0.4 g,the photocatalytic performance of Ag/TiO2 is the best under visible light.The degradation rate of 40mg/L methylene blue by Ag/Ti02 under visible light reached 96.85％,which was equivalent to that of pure TiO2 under ultraviolet light.The Ag/TiO2 catalytic process conforms to the first-order kinetic model.Through the doping of silver,the response wavelength of TiO2 is broadened to cover the visible light region and the catalytic efficiency is greatly improved.This study has reference significance for the application of titanium dioxide in the field of photocatalysis.
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