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Chemcial Industry and Engineering 2020, Vol. 37 Issue (4) :1-6    DOI: 10.13353/j.issn.1004.9533.20200107
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Degradation of Aniline by Dissolved Oxygen Catalyzed by Fe(Ⅱ)/Sulfite System
Lin Yiying, Song Baodong
School of Chemical Engineering and Technology, Tianjin University, Tianjin 300350, China

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Abstract Oxidation of aniline by dissolved oxygen (DO) catalyzed by the Fe(Ⅱ)/sulfite system was investigated in this study, and the oxidizing species involved in the oxidation process were also explored. The results showed that pH 4.0 and the molar ratio of sulfite to Fe(Ⅱ) of 10:1 were the optimal experimental conditions for aniline degradation, and 70% aniline could be removed. Fe(Ⅱ) plays an important role in the catalytic oxidation of aniline, and the removal efficiency of aniline was less than 30% in the presence of sulfite alone, and the reaction time was also prolonged from 90 min to 40 h. In the Fe(Ⅱ)/sulfite system, all Fe(Ⅱ) would be oxidized to Fe(Ⅲ) at pH 3.0, while Fe(Ⅱ) and Fe(Ⅲ) mostly existed in the complexed forms except pH 3.0. Quenching experiments in the presence of tert-butyl alcohol and methanol further confirmed that the SO4·- was the main oxidation species and SO5·- was the secondary oxidation species. This finding enriches our understanding on the degradation of organic pollutants by DO and the Fe(Ⅱ)/sulfite system, indicating that it has a wide application prospect in the treatment of organic industrial wastewater.
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Lin Yiying
Song Baodong
Keywordssulfite;   Fe(Ⅱ);   aniline;   sulfate radical     
Received 2020-01-12;
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Lin Yiying, Song Baodong.Degradation of Aniline by Dissolved Oxygen Catalyzed by Fe(Ⅱ)/Sulfite System[J]  Chemcial Industry and Engineering, 2020,V37(4): 1-6
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