Photocatalytic Oxidation of Methyl Mercaptan in Foul Gas for Odor Control

文献类型： 外文期刊

第一作者： Li, XZ

作者： Li, XZ;Hou, MF;Li, FB;Chua, H

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期刊名称：INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH （ 影响因子：3.72； 五年影响因子：3.99 ）

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收录情况： SCI

摘要： Methyl mercaptan(CH_3SH)is a representative odorous pollutant from various odor emission sources such as sewage and municipal solid wastes.This study confirms that CH_3SH in a synthetic foul gas can be effectively decomposed by UV-C(<280 nm)photolysis using germicidal lamps,but is resistant to destruction under UV-A(365 nm)irradiation using black-light lamps.This study also demonstrates that CH_3SH in foul gas can be successfully degraded by photocatalytic oxidation under UV-A irradiation using TiO_2-based photocatalysts.In this study,two new catalysts,NlV-modified TiO_2(NH_4~+-TiO_2)and SO_4~(2-)-modified TiO_2(SO_4~(2-)-TiO_2),were prepared by a precipitate-refluxing method and a hydrothermal method,respectively.These two catalysts as well as the commercially available catalyst Degussa P25(P25-TiO_2)were used for the photocatalytic degradation of CH_3SH.It was found that the NH_4~+-TiO_2 catalyst achieved a better performance than P25-TiO_2,whereas SO_4~(2-)-TiO_2 demonstrated a poorer performance.The high photocatalytic activity of NH_4~+-TiO_2 for CH_3SH degradation results from its basic characteristics and the presence of an ammonium(NH_4~+)group on the NH_4~+-TiO_2 catalyst surface.The photocatalytic degradation of CH_3SH was further studied using the P25-TiO_2 catalyst under different experimental conditions.The experimental results showed that catalyst loading,relative humidity,and initial concentration could influence the efficiency of CH_3SH photocatalytic degradation significantly.It was found that a catalyst loading of 3.93 mg cm~(-2)and a relative humidity of 43% are two essential factors for achieving the best performance under these experimental conditions.This work provides new insights into the removal of a sulfur-containing organic substance(CH_3SH)from the gas phase by both photolysis and photocatalytic oxidation processes.

分类号： TQ

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