TiO2鈥揨nO Composite Sphere Decorated with ZnO Clusters for Effective Charge Isolation in Photocatalysis

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• 作者：Lun Pan ; Guo-Qiang Shen ; Jing-Wen Zhang ; Xiao-Chu Wei ; Li Wang ; Ji-Jun Zou ; Xiangwen Zhang
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2015
• 出版时间：July 29, 2015
• 年：2015
• 卷：54
• 期：29
• 页码：7226-7232
• 全文大小：621K
• ISSN：1520-5045

文摘

TiO₂ and ZnO are extensively used photocatalysts, but their activity needs improvement due to rapid charge recombination. Herein, we designed and synthesized a novel structure of a TiO₂鈥揨nO composite sphere decorated with ZnO clusters by a one-pot solvethermal method. TEM and EDX characterizations show this structure contains a TiO₂ core, TiO₂鈥揨nO composite (type II heterojunction) surface layer, and surface c-axis ZnO clusters. The in situ Au and PbO₂ photodeposition shows that the photoinduced electrons and holes are driven to ZnO clusters and TiO₂, respectively, attributed to the synergy of the type II heterojunction of TiO₂鈥揨nO and high electron mobility of ZnO. The PL spectra confirm that such a structure is much more efficient in retarding the charge recombination than the sole TiO₂鈥揨nO sphere. Importantly, this structure shows higher photoactivity in degradation of rhodamine B and isomerization of norbornadiene than pure TiO₂, ZnO, and TiO₂鈥揨nO composite spheres.