AgNO3-Induced Photocatalytic Degradation of Odorous Methyl Mercaptan in Gaseous Phase: Mechanism of Chemisorption and Photocatalytic Reaction
文献类型： 外文期刊
作者： Liu, Tong-Xu 1 ; Li, Xiang-Zhong 1 ; Li, Fang-Bai 2 ;
作者机构： 1.Hong Kong Polytech Univ, Dept Civil & Struct Engn, Kowloon, Hong Kong, Peoples R China
2.Guangdong Inst Ecoenvironm & Soil Sci, Guangdong Key Lab Agr Environm Pollut Integrated, Guangzhou 510650, Peoples R China
期刊名称：ENVIRONMENTAL SCIENCE & TECHNOLOGY （ 影响因子：9.028； 五年影响因子：9.922 ）
ISSN：
年卷期：
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收录情况： SCI
摘要： In this study, AgNO3 films prepared by a simple dip-coating method were used to remove gaseous methyl mercaptan (CH3SH) for odor control. The AgNO3 films were characterized by means of X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FIR), scanning electron microscopy/energy-dispersive X-ray spectrometry (SEM/EDX), and X-ray photoelectron spectroscopy (XPS) before and after the reaction, and as-obtained products were identified by means of gas chromatog-raphy/mass spectrometry (GC/MS) and ion chromatography. The experiments demonstrated that the AgNO3 film can induce a quick chemisorption of gaseous CH3SH to form AgSCH3 and other intermediate products such as α-Ag2S, Ag4S2, and AgSH on its surface. Under UVA illumination, these sulfur products can be photocatalytically oxidized to AgSO3CH3 and Ag2SO4. Then AgSO3CH3 and Ag2SO4 will continue the chemisorption of gaseous CH3SH, similar to AgNO3, to form AgSCH3 again and release two final products, HSO3CH3 and H2SO4. Hence it is a AgNO3-induced photocatalytic reaction for odorous CH3SH degradation in gaseous phase. This fundamental research about the mechanism of chemisorption and photocatalytic reaction provides essential knowledge with potential to further develop a new process for gaseous CH3SH degradation in odor control.
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