College of Environmental Science and Engineering and the Key Laboratory of Pollution Control and Ecosystem Restoration in Industry Clusters, Ministry of Education, South China University of Technology, Guangzhou 510006, China.
J Environ Sci (China). 2012;24(5):821-6. doi: 10.1016/s1001-0742(11)60844-9.
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.
过硫酸盐氧化苯胺的反应动力学研究及其在不同温度、过硫酸盐浓度和 pH 值条件下的批实验。结果表明，苯胺的降解遵循伪一级反应模型。苯胺降解速率随温度或过硫酸盐浓度的升高而增加。在 pH 值为 3 到 11 的范围内，在强酸体系 (pH 3) 中得到了较低的苯胺降解速率，而在强碱性 (pH 11) 中则达到了较高的降解速率。当溶液处于弱酸性和弱碱性 (pH 5、7 和 9) 时，在 pH 7 时苯胺的降解率最大。利用液相色谱-质谱联用技术鉴定了氧化过程中产生的中间产物。并且鉴定出硝基苯、4-4'-二氨基二苯和 1-羟基-1,2-二苯肼是过硫酸盐氧化苯胺的主要中间产物，并初步提出了苯胺的降解机理。
