Preparation and photocatalytic performance of ZnO/ZnGa₂O₄ composite microspheres

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• 作者：Li Zhang 张丽 ; Chao-hua Dai 戴超华 ; Xiu-xiu Zhang 张秀秀…
• 关键词：Key wordsZnO/ZnGa2O4 ; photocatalytic performance ; microspheres ; simulated sunlight
• 刊名：Journal of Central South University
• 出版年：2016
• 出版时间：December 2016
• 年：2016
• 卷：23
• 期：12
• 页码：3092-3099
• 全文大小：
• 刊物类别：Engineering
• 刊物主题：Engineering, general; Metallic Materials;
• 出版者：Central South University
• ISSN：2227-5223
• 卷排序：23

文摘

ZnO/ZnGa₂O₄ composite microspheres with heterojunction were successfully synthesized by one-pot hydrothermal method. These samples were characterized by TG/DTA, XRD, TEM, HRTEM, UV-vis DRS, FL and BET techniques. The results indicated the as-prepared samples showed better degree of crystalline and large specific surface area. The photocatalytic activity was evaluated by degradation of methyl orange with the concentration of 50 mg/L under the irradiation of simulated sunlight. The effects of molar ratio of Zn to Ga and calcination temperature on the photocatalytic activity were investigated in detail. The results showed that the highest photocatalytic degradation efficiency was observed at the molar ratio of Zn to Ga of 1:0.5 in the starting materials and the calcination temperature of 400 °C. The maximum photocatalytic degradation rate of MO was 97.1% within 60 min under the simulated sunlight irradiation, which is greatly higher than that of ZnO and ZnGa₂O₄.