DRIFTS Evidence for Facet-Dependent Adsorption of Gaseous Toluene on TiO2 with Relative Photocatalytic Properties

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• 作者：Mengjiao Wang ; Fan Zhang ; Xiaodi Zhu ; Zeming Qi ; Bin Hong ; Jianjun Ding ; Jun Bao ; Song Sun ; Chen Gao
• 刊名：Langmuir
• 出版年：2015
• 出版时间：February 10, 2015
• 年：2015
• 卷：31
• 期：5
• 页码：1730-1736
• 全文大小：458K
• ISSN：1520-5827

文摘

Effective adsorption is of great importance to the photocatalytic degradation of volatile organic compounds. Herein, we succeeded in the preparation of anatase TiO₂ with clean dominant {001} and {101} facets. By using in situ diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) equipped with a homemade reaction system and a coupling gas-dosing system, we found that TiO₂ with dominant {001} facets exhibits higher toluene adsorption capacity than TiO₂ with dominant {101} facets, which may be attributed to the different number of unsaturated 5c-Ti capable of forming the main active adsorption sites (terminal Ti鈥揙H species). TiO₂ with dominant {001} facets shows a significantly high photocatalytic degradation performance, with its degradation rate being 6 times higher than that of dominant {101} facets. Combined with simulation results, it is suggested that the synergetic effects of the formation of specific active adsorption sites, the low adsorption energy for toluene, and preservation of the free molecularly adsorbed water on the surface promote the degradation of gaseous toluene on the dominant {001} facets. This study exemplifies that the facet-dependent adsorption of volatile organic compounds is one of the most important factors to effectively engineer photocatalysts for air purification.