Degradation of Cationic Red GTL by Catalytic Wet Air Oxidation over Mo-Zn-Al-O Catalyst under Room Temperature and Atmospheric pressure
Degradation of Cationic Red GTL by Catalytic Wet Air Oxidation over Mo-Zn-Al-O Catalyst under Room Temperature and Atmospheric pressure
复制标题
常温常压 Mo-Zn-Al-O 催化剂催化湿式空气氧化降解阳离子红 GTL
DOI：
10.1021/es203531q
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发表时间：
2012-03-06
影响因子：
11.4
通讯作者：
Wang, Xueye
中科院分区：
文献类型：
--
作者：
Xu, Yin;Li, Xiaoyi;Wang, Xueye
为克服高温高压催化湿式氧化法（CWAO）的缺点，在常温常压下考察了Mo-Zn-Al-O催化剂对阳离子红GTL的催化降解性能。采用共沉淀法和浸渍法制备了Mo-Zn-Al-O催化剂。采用XRD、TG-DTG和XPS对所得样品进行了表征。采用响应面中心组成设计法对阳离子红GTL脱色各因素的相关性进行优化。结果表明，在pH值为4.0、染料初始浓度为85 mg/L、催化剂投加量为2.72 g/L的条件下，脱色率和TOC去除率分别达到80.1%和50.9%。此外，还利用电子自旋共振（ESR）和GC-MS技术研究了Mo-Zn-Al-O催化剂对阳离子红GTL的降解反应及其机理。其可能的反应机理是Mo-Zn-Al-O催化剂能有效地与吸附氧/H2O反应生成中心点OH和O-1（2），最终诱导阳离子红GTL的降解。对降解产物的GC-MS分析表明，阳离子红GTL是由-N=N-断裂引发的，中间体被中心点OH或O-1进一步氧化（2）。
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/H2O to produce center dot OH and O-1(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 center dot OH or O-1(2).