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| Degradation of triclocarban aqueous solution through UV irradiation-activated sodium persulfate process |
| LUO Jing-yu1,2, LI Xue-yan1, LI Qing-song2, YAO Ning-bo1,2, LU Bao-song2,4, LI Guo-xin2, CHEN Guo-yuan2, LIAO Wen-chao2, GAO Nai-yun3 |
1. School of Environmental Science and Engineering, Suzhou University of Science and Technology, Suzhou 215009, China;
2. Water Resources and Environmental Institute, Xiamen University of Technology, Xiamen 361024, China;
3. National Key Laboratory of Pollution Control and Reuse, Tongji University, Shanghai 200092, China;
4. College of Civil Engineering and Architecture, Zhejiang University of Technology, Hangzhou 310014, China |
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Abstract Triclocarban (TCC) in aqueous solution was degraded by UV-activated persulfate. The removal efficiency of TCC by direct UV irradiation, PS oxidation alone, and UV/PS process was compared in this experiment. The effect of PS dosage, initial pH and HA on TCC degradation by UV/PS was investigated. The possible degradation approach and intermediates was proposed, meanwhile, the effect of degradation and economical efficiency for UV/PS were compared with UV/H2O2. The results showed that UV irradiation-activated sodium persulfate process could remove TCC efficiently and TCC degradation followed the pseudo-first order kinetic model well (R2 ≥ 0.95). The pseudo-first-order-constant k increased firstly and then decreased with the increase of PS dosage. The value of k reached a maximum of 0.0810min-1 when the dosage of PS was 250μmol/L. Slightly acidic condition (pH=6.0) was better for TCC degradation. The removal of TCC was inhibited in the presence of HA, and the effect of inhibition was significantly positively correlated with the concentration of HA. 1-chloro-4-isocyanato-benzen and 4-chloroaniline were identified as the main intermediates by GC/MS. The possible degradation approach is that the C-N chemical bonds of the keto carbonyl group were broken during the degradation process, and thus 1-chloro-4-isocyanato-benzen and 4-chloroaniline was generated via the dechlorination and other reactions. The concentration of Cl-was increased through the degradation process of TCC by UV/PS. Compared with UV/H2O2 process, the pseudo-first-order-constant k and the electrical energy per order of UV/PS process increased by 96.65% and 97%, respectively.
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Received: 28 February 2017
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