Wang Haiqiang, Wu Zhongbiao, Liu Yue, Wang Yuejun
Department of Environmental Engineering, Zhejiang University, Zhe Da Road, No. 38, Hangzhou 310027, Zhejiang, PR China.
Chemosphere. 2009 Feb;74(6):773-8. doi: 10.1016/j.chemosphere.2008.10.032. Epub 2008 Dec 16.
Various surface platinized TiO(2) were prepared by four different preparation methods and investigated with respect to their behaviors in UV photocatalytic oxidation of nitric oxide. The physicochemical properties of the Pt modified TiO(2) were investigated by X-ray diffraction analysis, X-ray photoelectron spectrum analysis, transmission electron microscopy, and photoluminescence spectra. From the experimental results, it was found that new electronic states were observed above the valence bands of PtOx-TiO(2) and PtClx-TiO(2). And the lifetime of electrons and holes was found prolonged in the PtOx-TiO(2) catalysts. The activity tests showed that the dopants existed as metallic Pt and platinum chloride had little contribution to the photocatalytic oxidation of NO in gas phase. However, the dopant which existed as PtOx could improve the NO photocatalytic oxidation efficiency and the reaction rate. The photocatalytic activity of the 0.05 at% PtOx-TiO(2) was nearly three times higher than that of the pure Degussa P25 with an inlet NO concentration of 200 ppm.
通过四种不同的制备方法制备了各种表面镀铂的TiO₂，并研究了它们在紫外光催化氧化一氧化氮中的行为。通过X射线衍射分析、X射线光电子能谱分析、透射电子显微镜和光致发光光谱研究了铂修饰TiO₂的物理化学性质。从实验结果发现，在PtOx-TiO₂和PtClx-TiO₂的价带上方观察到了新的电子态。并且发现PtOx-TiO₂催化剂中电子和空穴的寿命延长。活性测试表明，以金属铂形式存在的掺杂剂和氯化铂对气相中NO的光催化氧化贡献很小。然而，以PtOx形式存在的掺杂剂可以提高NO的光催化氧化效率和反应速率。在入口NO浓度为200 ppm时，0.05 at% PtOx-TiO₂的光催化活性比纯德固赛P25高出近三倍。
