Gram-scale wet chemical synthesis of Ag₂O/TiO₂ aggregated sphere heterostructure with high photocatalytic activity

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• 作者：Hao Hua^a ; Yi Xi^a ; ^{yxi6@cqu.edu.cn} ; Zhenhuan Zhao^b ; Xiao Xie^a ; Chenguo Hu^a ; Hong Liu^b
• 关键词：Ag2O ; TiO2 ; Heterostructure ; Aggregated sphere ; Photocatalyst
• 刊名：Materials Letters
• 出版年：2013
• 出版时间：15 January, 2013
• 年：2013
• 卷：91
• 期：Complete
• 页码：81-83
• 全文大小：688 K

文摘

Ag₂O/TiO₂ aggregated sphere heterostructure with high photocatalytic activity under the simulated sunlight was achieved via a simple and gram-scale three-step wet chemical synthesis. The Ag₂O nanoparticles with a diameter of 10-60 nm were uniformly coated on the surface of the TiO₂ aggregated spheres with a diameter of 370-450 nm. Compared with pristine TiO₂ aggregated spheres and pure Ag₂O nanoparticles, the heterostructure photocatalysts exhibit an enhanced photocatalytic activity under the simulated sunlight irradiation in the degradation of methyl orange. A mechanism was proposed to account for the photocatalytic activity of the Ag₂O/TiO₂ heterostructure. This report presents that large band gap semiconductor photocatalysts modified by narrow band gap metal oxide will be an effective way to enhance sunlight photocatalytic activity.