Degradation of Cationic Red GTL by Catalytic Wet Air Oxidation over Mo鈥揨n鈥揂l鈥揙 Catalyst under Room Temperature and Atmospheric pressure
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- 作者：Yin Xu ; Xiaoyi Li ; Xiang Cheng ; Dezhi Sun ; Xueye Wang
- 刊名：Environmental Science & Technology (ES&T)
- 出版年：2012
- 出版时间：March 6, 2012
- 年：2012
- 卷：46
- 期：5
- 页码：2856-2863
- 全文大小：496K
- 年卷期：v.46,no.5(March 6, 2012)
- ISSN：1520-5851
文摘
To overcome the drawback of catalytic wet air oxidation (CWAO) with high temperature and high pressure, the catalytic activity of Mo鈥揨n鈥揂l鈥揙 catalyst for degradation of cationic red GTL under room temperature and atmospheric pressure was investigated. Mo鈥揨n鈥揂l鈥揙 catalyst was prepared by coprecipitation and impregnation. XRD, TG-DTG, and XPS were used to characterize the resulting sample. Central composition design using response surface methodology was employed to optimize correlation of factors on the decolorization of cationic red GTL. The results show that the optimal conditions of pH value, initial concentration of dye and catalyst dosage were found to be 4.0, 85 mg/L and 2.72 g/L, respectively, for maximum decolorization of 80.1% and TOC removal of 50.9%. Furthermore, the reaction on the Mo鈥揨n鈥揂l鈥揙 catalyst and degradation mechanism of cationic red GTL was studied by Electron spin resonance (ESR) and GC-MS technique. The possible reaction mechanism was that the Mo鈥揨n鈥揂l鈥揙 catalyst can efficiently react with adsorbed oxygen/H2O to produce 路OH and 1O2 and finally induce the degradation of cationic red GTL. GC-MS analysis of the degradation products indicates that cationic red GTL was initiated by the cleavage of 鈥擭鈺怤鈥?and the intermediates were further oxidized by 路OH or 1O2.