Synthesis of nanostructured ZnO/Bi₂WO₆ heterojunction for photocatalysis application

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• 作者：YuLin Min^a ; ^b ; ^{ahaqmylin@yahoo.com.cn} ; Kan Zhang^c ; ^{zhangkan112255@hotmail.com} ; YouCun Chen^a ; ^b ; YuanGuang Zhang^a ; ^b ; Wei Zhao^d
• 关键词：ZnO/Bi2WO6 heterojunction ; Visible response ; Photocatalytic activity ; Charge transfer ; Solar energy conversion
• 刊名：Separation and Purification Technology
• 出版年：2012
• 期刊代码：78_13835866
• 类别：ce
• 出版时间：18 May, 2012
• 卷：92
• 期：Complete
• 页码：115-120
• 文件大小：1334 K

摘要

We reported on a novel visible responding ZnO/Bi₂WO₆ heterojunction photocatalyst for the efficient photodegradation of pollutant. The heterojunction photocatalysts were prepared by dispersing the Bi₂WO₆ precursor into Zn(OH)₂ solution, the precipitates at 500 掳C to form Bi₂WO₆ and ZnO crystals simultaneously. Compared to individual ZnO and Bi₂WO₆, ZnO/Bi₂WO₆ significantly improved photocatalytic properties with high stability due, we believe, to high efficient separation of the photogenerated charge at the ZnO/Bi₂WO₆ interface under visible light irradiation. It was found that ZnO contents in the heterojunction photocatalyst significantly influenced charge separation and transfer at the interface. With reintroduction of Pt nanoparticles, the photocatalytic activity of ZnO/Bi₂WO₆ could be further enhanced for specific issues, such as degradation of sensitized Rhodamine B (Rh.B) dye. In this work, we determined that the ZnO/Bi₂WO₆ heterojunction with a tunable property can be applied to wide solar energy conversion.