摘要
以γ-Al2O3为载体,利用浸渍法自制Ni2O3-MnO2-CeO2/γ-Al2O3催化剂催化次氯酸钠处理甲基橙废水,探讨了甲基橙降解的反应动力学和热力学,并运用紫外-可见吸收光谱研究甲基橙的降解机理。结果表明:降解甲基橙反应为一级反应,其反应速率常数受到甲基橙初始浓度和反应温度的影响,反应活化能为25 305.74 J/mol。此外,根据紫外-可见吸收光谱初步推测了甲基橙的降解机理主要包括脱甲基化和裂解开环等反应,最终甲基橙被分解成苯酚、对苯二酚、苯醌和丁烯二酸等中间产物。
Supported Ni2O3-MnO2-CeO2/g-Al2O3 catalysts were prepared by immersion method with g-Al2O3 as carrier. The catalysts were applied to treat the methyl orange wastewater. Kinetics and thermodynamics were discussed and the degradation mechanism of methyl orange wastewater was studied by UV-visible absorption spectra. The analysis result of reaction kinetics revealed that the degradation of methyl orange was first-order kinetics and the reaction velocity was affected by methyl orange initial concentration and the temperature. The reaction activation energy was 25 305.74 J/mol. Analytical result of UV-visible absorption spectra indicated the pyrolysis reactions of methyl orange mainly included demethylation and open ring reactions, finally methyl orange was degraded into intermediates,such as phenol, hydroquinone, benzoquinone and butenedioic acid and so on.
作者
吴正雷
彭文博
董凯
罗小勇
庄力
WU Zheng-lei;PENG Wen-bo;DONG Kai;LUO Xiao-yong;ZHUANG Li(Jiangsu Jiuwu Hi-Tech Co.,Ltd.,Jiangsu Nanjing 211808,China)
出处
《当代化工》
CAS
2020年第5期850-854,共5页
Contemporary Chemical Industry
关键词
催化氧化
次氯酸钠
甲基橙
动力学
降解机理
Catalytic oxidation
Sodium hypochlorite
Methyl orange
Dynamics
Degradation mechanism
