Degradation kinetics and mechanism of aniline by heat-assisted persulfate oxidation

Oxidation of aniline by persulfate in aqueous solutions was investigated and the reaction kinetic rates under different temperature, persulfate concentration and pH conditions were examined in batch experiments. The results showed that, the aniline degradation followed pseudo first-order reaction mo...

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Bibliographic Details
Published in:Journal of environmental sciences (China) 2012-05, Vol.24 (5), p.821-826
Main Authors: Xie, Xiaofang, Zhang, Yongqing, Huang, Weilin, Huang, Shaobing
Format: Article
Language:English
Subjects:
alkalinity
aniline
Aniline Compounds - chemistry
aqueous solutions
Chromatography, High Pressure Liquid
Hot Temperature
Hydrogen-Ion Concentration
kinetic
Kinetics
liquid chromatography
Mass Spectrometry
mechanism
Minerals - chemistry
oxidation
Oxidation-Reduction
persulfate
pH值
Solutions
Sulfates - chemistry
Temperature
反应动力学
氧化降解
水溶液
苯胺
过硫酸钾氧化
降解机制
降解率
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Summary:Oxidation of aniline by persulfate in aqueous solutions was investigated and the reaction kinetic rates under different temperature, persulfate concentration and pH conditions were examined in batch experiments. The results showed that, the aniline degradation followed pseudo first-order reaction model. Aniline degradation rate increased with increasing temperature or persulfate concentration. In the pH range of 3 to 11, a low aniline degradation rate was obtained at strong acid system (pH 3), while a high degradation rate was achieved at strong alkalinity (pH 11). Maximum aniline degradation occurred at pH 7 when the solution was in a weak level of acid and alkalinity (pH 5, 7 and 9). Produced intermediates during the oxidation process were identified using liquid chromatography-mass spectrometry technology. And nitrobenzene, 4-4′-diaminodiphenyl and 1-hydroxy-1,2-diphenylhydrazine have been identified as the major intermediates of aniline oxidation by persulfate and the degradation mechanism of aniline was also tentatively proposed.
ISSN:1001-0742
1878-7320
DOI:10.1016/S1001-0742(11)60844-9