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Vol. 25 No. 3 (2013): Vol 25 Issue 3

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Degradation of the Antibiotic Sulfamethoxazole in Aqueous Solutions by g-Irradiation

https://doi.org/10.14233/ajchem.2013.13135
J.Q. Wang
State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, No. 163, Xianlin Road, Nanjing 210093, Jiangsu, P.R. China
B.G. Zheng
State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, No. 163, Xianlin Road, Nanjing 210093, Jiangsu, P.R. China
J.B. Zhang
Department of Environmental Science and Engineering, Fudan University, No. 220, Handan Road, Shanghai 200433, P.R. China
Z. Zheng
Department of Environmental Science and Engineering, Fudan University, No. 220, Handan Road, Shanghai 200433, P.R. China

Corresponding Author(s) : J.B. Zhang

jbzhang@fudan.edu.cn

Asian Journal of Chemistry, Vol. 25 No. 3 (2013): Vol 25 Issue 3

Abstract

This study focused on the degradation of antibiotic sulfamethoxazole (SMX) in aqueous solutions by g-irradiation. The influences of initial sulfamethoxazole concentration, solution pH, various additives (H2O2, CH3OH, humic acid and thiourea) and absorbed dose on sulfamethoxazole degradation were investigated. At a sulfamethoxazole concentration of 26.4 mg L-1 and an absorbed dose of 1.1 kGy, the extent of sulfamethoxazole degradation was 99 %. The degradation reaction of sulfamethoxazole followed first-order like kinetics. Added humic acid or 0.3 % H2O2 enhanced the sulfamethoxazole degradation, while CH3OH, 0.9 % H2O2 and thiourea additives significantly inhibited sulfamethoxazole degradation. The degradation efficiency was higher under acidic conditions than in neutral or alkaline media. The solution pH and total organic carbon became lower as the absorbed dose increased. The possible degradation pathway was proposed.

Keywords

Sulfamethoxazole Degradation γ-Irradiation
Wang, J., Zheng, B., Zhang, J., & Zheng, Z. (2012). Degradation of the Antibiotic Sulfamethoxazole in Aqueous Solutions by g-Irradiation. Asian Journal of Chemistry, 25(3), 1536–1540. https://doi.org/10.14233/ajchem.2013.13135
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