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Synthesis and Photocatalytic Activity of One-dimensional ZnO-Zn2SnO4 Mixed Oxide Nanowires
?Xue-lian Bai,Nan Pan ,Xiao-ping Wang,Hai-qian Wang*
Author NameAffiliationE-mail
?Xue-lian Bai Hefei National Laboratory for Physical Sciences at the Microscale, University of Science and Technology of China, Hefei 230026, China  
Nan Pan Hefei National Laboratory for Physical Sciences at the Microscale, University of Science and Technology of China, Hefei 230026, China  
Xiao-ping Wang Hefei National Laboratory for Physical Sciences at the Microscale, University of Science and Technology of China, Hefei 230026, China  
Hai-qian Wang* Hefei National Laboratory for Physical Sciences at the Microscale, University of Science and Technology of China, Hefei 230026, China hqwang@ustc.edu.cn 
Abstract:
Mixed oxide photocatalysts, ZnO-Zn2SnO4 (ZnO-ZTO) nanowires with different sizes were prepared by a simple thermal evaporation method. The ZnO-ZTO nanowires were characterized with a scanning electron microscope, X-ray diffraction, high-resolution transmission electron microscopy, energy-dispersive spectrometer, and X-ray photoelectron spectrThe photocatalytic activity of the ZnO-ZTO mixed nanowires were studied by observing the photodegradation behaviors of methyl orange aqueous solution. The results suggest that the ZnO-ZTO mixed oxide nanowires have a higher photocatalytic activity than pure ZnO and Zn2SnO4 nanowires. The photocatalyst concentration in the solution distinctly affects the degradation rate, and our results show that higher photodegradation efficiency can be achieved with a smaller amount of ZnO-ZTO nanowire catalyst, as compared to the pure ZnO and ZTO nanowires. Moreover, the photocatalytic activity can also be enhanced by reducing the average diameter of the nanowires. The activity of pure ZnO and ZTO nanowires are also enhanced by physically mixing them. These results can be explained by the synergism between the two semiconductors.
Key words:  ZnO, Zn2SnO4, Nanowire, Photocatalytic activity, Photodegradation
FundProject:国家自然科学基金
Synthesis and Photocatalytic Activity of One-dimensional ZnO-Zn2SnO4 Mixed Oxide Nanowires
白雪莲,潘楠,王晓平,王海千*
摘要:
采用简单的热蒸发方法得到具有不同尺寸的混合ZnO-Zn2SnO4 (ZnO-ZTO)纳米线,并对纳米线进行结构和成分分析,试验还以甲基橙溶液为处理对象考察了ZnO-ZTO纳米线的光催化活性.结果表明ZnO-ZTO 混合纳米线的光催化性较纯ZnO、纯Zn2SnO4纳米线有较大提高; 光催化剂浓度对光降解效率有很大影响, 与纯ZnO、纯Zn2SnO4纳米线相比,少量的ZnO-ZTO纳米线即达到较高的光催化效率;并且光催化活性随着纳米线直径的减小而增加. 实验表明异质结的存在能够加快电子空穴的分离,提高光催化活
关键词:  ZnO,Zn2SnO4,纳米线,光催化活性,光降解
DOI:10.1088/1674-0068/21/01/81-86
分类号: