title: Degradation of cationic red GTL by catalytic wet air oxidation over Mo-Zn-Al-O catalyst under room temperature and atmospheric pressure.
abstract: To overcome the drawback of catalytic wet air oxidation (CWAO) with high temperature and high pressure, the catalytic activity of Mo-Zn-Al-O catalyst for degradation of cationic red GTL under room temperature and atmospheric pressure was investigated. Mo-Zn-Al-O 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-Zn-Al-O 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-Zn-Al-O catalyst can efficiently react with adsorbed oxygen/H(2)O to produce ·OH and (1)O(2) 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 -N ═ N- and the intermediates were further oxidized by ·OH or (1)O(2).
authors.affiliation: Beijing Key Laboratory for Source Control Technology of Water Pollution, Beijing Forestry University, Beijing 100083, PR China.
authors.forename: Yin
authors.initials: Y
authors.lastname: Xu
authors.forename: Xiaoyi
authors.initials: X
authors.lastname: Li
authors.forename: Xiang
authors.initials: X
authors.lastname: Cheng
authors.forename: Dezhi
authors.initials: D
authors.lastname: Sun
authors.forename: Xueye
authors.initials: X
authors.lastname: Wang
mesh_terms: D000388:Air / Q000032:analysis*; D000535:Aluminum / Q000737:chemistry*; D001274:Atmospheric Pressure; D001391:Azo Compounds / Q000737:chemistry*; D002384:Catalysis; D003116:Color; D004396:Coloring Agents / Q000737:chemistry*; D004055:Differential Thermal Analysis; D004578:Electron Spin Resonance Spectroscopy; D006813:Humidity; D008982:Molybdenum / Q000737:chemistry*; D009930:Organic Chemicals / Q000737:chemistry; D010084:Oxidation-Reduction; D056951:Photoelectron Spectroscopy; D000644:Quaternary Ammonium Compounds / Q000737:chemistry*; D015203:Reproducibility of Results; D013499:Surface Properties; D013696:Temperature; D013818:Thermogravimetry; D014961:X-Ray Diffraction; D015032:Zinc / Q000737:chemistry*
chemical_list: D001391:Azo Compounds; D004396:Coloring Agents; D009930:Organic Chemicals; D000644:Quaternary Ammonium Compounds; C572408:cationic red GTL; D008982:Molybdenum; D000535:Aluminum; D015032:Zinc