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| Role of two mediators in sulfonamide antibiotics degradation by laccase oxidation system |
| DING Hui-jun1,2,3, WU Yi-xiao1, ZHONG Jia-you2,3, ZOU Bin-chun2,3, ZHANG Wei-hao1, LOU Qian2,3 |
1. School of Resource and Environmental Science, Wuhan University, Wuhan 430079, China;
2. Jiangxi Provincial Institute of Water Sciences, Nanchang 330029, China;
3. Jiangxi Provincial Key Laboratory of Water Resources and Environment of Poyang Lake, Nanchang 330029, China |
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Abstract Two kinds of mediators, namely syringaldehyde (SA) and1-hydroxybenzotriazole (HBT), were investigated in laccase oxidation system, regarding the degradation of five kinds of typical sulfonamide antibiotics. The influences of factors, such as the initial concentrations of mediators, pH, temperature and the concentration of laccase, were studied. The results showed that SA was more effective in mediating laccase oxidation of all five kinds of sulfonamide antibiotics. In laccase+SA reaction system, the optimum conditions for the degrading the sulfonamide antibiotics by laccase were: at pH5~6 and 30℃, and with initial concentrations of SA and laccase respectively 0.5mmol/L and 0.5mg/mL. The degradation rates reached around 75% in 15minutes and more than 97% within 1hour for all five kinds of sulfonamide antibiotics. This study showed that the appropriate mediator can greatly improve laccase oxidation. Laccase oxidation assisted by mediators has a good application potential for the ecological purification of antibiotic pollutants.
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Received: 28 September 2015
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