Degradation of dimethyl phthalate in aqueous solution by microwave-induced catalytic oxidation with Fe3O4/activated carbon catalyst

被引：0
作者：
Li Z. [1 ,2 ,3 ]
Zhao X. [1 ,2 ,3 ]
Huang J. [1 ,2 ,3 ]
Wang H. [1 ]
Li P. [1 ]
机构：
[1] College of Environmental and Biological Engineering, Putian University, Putian
[2] Fujian Provincial Key Laboratory of Ecology-Toxicological Effects & Control for Emerging Contaminants, Putian
[3] Key Laboratory of Ecological Environment and Information Atlas, Fujian Provincial University, Putian
来源：
Huagong Jinzhan/Chemical Industry and Engineering Progress | 2021年 / 40卷 / 02期
关键词：
Catalysis; Catalyst; Degradation; DMP; Fe[!sub]3[!/sub]O[!sub]4[!/sub]/AC; Microwave-induced catalytic oxidation process;
D O I：
10.16085/j.issn.1000-6613.2020-0571
中图分类号：
学科分类号：
摘要：
In order to effectively improve the catalytic activity and separation of activated carbon in microwave field, magnetic Fe3O4/activated carbon(Fe3O4/AC) catalyst was prepared by chemical coprecipitation method, which was then used for the catalytic oxidation degradation of dimethyl phthalate(DMP) in aqueous solution under microwave radiation. The microstructures, morphology and magnetic properties of the catalysts were characterized by BET, SEM/EDS, XRD, XPS, FTIR and VSM. The effects of different reaction systems on the rate and kinetics of DMP degradation were studied. The effects of the amount of catalyst, the power of microwave radiation and the initial pH of the solution on the microwave-induced oxidation degradation of DMP with Fe3O4/AC were discussed. The reusability of Fe3O4/AC was also investigated. The results showed that Fe3O4 was the main iron oxide in the prepared catalysts, and was successfully loaded on the activated carbon. The saturation magnetization of superparamagnetic Fe3O4/AC could reach 21.2emu/g, and it could be quickly separated from the solution by external magnetic field. The degradation rates of DMP in the microwave-induced catalytic oxidation systems were higher than those with adsorption alone and microwave irradiation alone, and the degradation processes all followed the first-order reaction kinetics. The degradation rates of DMP could be enhanced with the increase of the dosage of Fe3O4/AC, the power of microwave radiation, and the initial pH of the solution. Repeated experiments showed that Fe3O4/AC had an excellent catalytic stability and reusability, and the degradation rate of DMP remained at 83.5% after 5cycles. It is concluded by GC-MS analysis that the degradation of DMP could be achieved by 5 pathways: hydrolysis, isomerization, hydroxylation, benzene ring trisubstitution and ring opening mineralization. © 2021, Chemical Industry Press Co., Ltd. All right reserved.
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页码：870 / 880
页数：10
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