Effect of noble metal deposition on Ga2O3-based photocatalytic degradation of organic dyes
Five noble elements(Au,Ag,Pd,Rh,and Ru) were successfully loaded onto the rod-like Ga2O3 material by the deposition-precipitation method. The surface morphology and crystal structure of catalysts were examined both before and after loading,and the photocatalytic performance were evaluated by degrading organic dyes. Ag Loading Ga2O3 exhibited the best photocatalysis under the irradiation of 300 W Xenon lamp,degrading 83％ of Indigo Carmine(IC,50 mg/ L) with a rate constant of 0. 14 min-1 after 12 min of reaction and up to 0. 084 min-1 under the irradiation of 10 W visible light. In addition,the Ga2O3-Ag catalyst also showed excellent photocatalytic activity for other organic dyes(MO,MB,MV and RhB,10 mg/ L). UV-vis diffuse reflectance spectroscopy,photocurrent transient response and photoluminescence luminescence spectroscopy results demonstrated that Ag loading enhanced absorption ability of visible light and increased separation efficiency of photogenerated carriers,thereby significantly improving the photocatalytic performance of Ga2O3.
Ga2O3 semiconductornobel metal depositionphotocatalysisdegradation of organic dyesheterojunction
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