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Title: Photocatalytic oxidation of methyl mercaptan in foul gas for odor control
Authors: Li, XZ
Hou, MF
Li, FB
Chua, H
Issue Date: 2006
Publisher: American Chemical Society
Source: Industrial and engineering chemistry research, 2006, v. 45, no. 2, p. 487-494 How to cite?
Journal: Industrial and engineering chemistry research 
Abstract: 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, NH 4 +-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.
ISSN: 0888-5885
EISSN: 1520-5045
DOI: 10.1021/ie050343b
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