吴正雷 彭文博 董凯

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。

关  键  词：催化氧化;次氯酸钠;甲基橙;动力学;降解机理

中图分类号：X703.1        文献标识码： A      文章编号： 1671-0460（2020）05-0850-05

Abstract： Supported Ni2O3-MnO2-CeO2/-Al2O3 catalysts were prepared by immersion method with-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.

Key words： Catalytic oxidation; Sodium hypochlorite; Methyl orange; Dynamics; Degradation mechanism

次氯酸钠俗称漂白水，在常温下即有高效的氧化作用，因此常用作消毒剂、漂白剂[1]。在废水（尤其是印染废水）色度去除方面具有独特的优势，但由于次氯酸钠稳定性较差，较高的温度或日光照射容易导致其发生分解，生成NaClO3、NaCl和HCl等副产物，降低了次氯酸钠的利用率。针对次氯酸钠的上述缺点，国内外学者研究证实镍基催化剂能促进NaClO产生强氧化性的新生态氧[O]，可以有效提高NaClO的反应速率和氧化性[2，3]。这是由于镍基催化剂具备价态可变的特性，能够促进氧化还原循环进行[4，5]。龚雪君[6]采用Ni2O3/AC催化剂，以NaClO为氧化剂，催化氧化蒽醌染料中间体1-氨基蒽醌废水。实验结果表明，Ni2O3/AC催化剂在碱性环境下对废水有较好的处理效果，COD去除率达到85.1%，脱色率达到96.5%。

目前对Ni基催化剂催化次氯酸鈉氧化有机废水的……