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首页> 外文期刊>Transactions of Nonferrous Metals Society of China >Photocatalytic oxidation activity of titanium dioxide film enhanced by Mn non-uniform doping
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Photocatalytic oxidation activity of titanium dioxide film enhanced by Mn non-uniform doping

机译：Mn非均匀掺杂增强二氧化钛薄膜的光催化氧化活性

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The thin films of TiO_2 doped by Mn non-uniformly were prepared by sol-gel method under process control. Each film was characterized by XPS, SEM, UV-vis spectrophotometry and electrochemistry workstation analysis. The activity of the photocatalyst was evaluated by the kinetics of photocatalytic degradation of aqueous methyl orange under the UV radiation. The results show that Mn non-uniform doping evidently enhances the photocatalytic activity of TiO_2 thin film. In 80 min, the degradation rates of aqueous methyl orange are 62 percent, 12 percent and 34 percent for Mn non-uniformly doped film (0.7 percent), the uniformly doped film (0.7 percent) and pure titanium dioxide film, respectively. The characteristic of PN junction in the film was proved by electrochemical characterization. A mechanism for enhanced photocatalytic activity of Mn non-uniformly doped titanium dioxide film was discussed based on the effective separation of the photon-generated carrier because of the existence of the PN junction.
机译：在工艺控制下，采用溶胶-凝胶法制备了Mn不均匀掺杂的TiO_2薄膜。通过XPS，SEM，UV-可见分光光度法和电化学工作站分析来表征每个膜。通过在紫外线辐射下甲基橙水溶液的光催化降解动力学来评估光催化剂的活性。结果表明，Mn不均匀掺杂明显增强了TiO_2薄膜的光催化活性。在80分钟内，对于Mn非均匀掺杂膜（0.7％），均匀掺杂膜（0.7％）和纯二氧化钛膜，甲基橙水溶液的降解率分别为62％，12％和34％。通过电化学表征证明了薄膜中PN结的特性。基于PN结的存在，基于光子载流子的有效分离，探讨了一种提高Mn非均匀掺杂二氧化钛薄膜光催化活性的机理。

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