Gamma irradiation-induced sulfadiazine degradation and its removal mechanisms

• Published in: Chemical engineering journal (Lausanne, Switzerland : 1996) Vol. 191; pp. 256 - 262
• Main Authors: Guo, Zhaobing, Zhou, Fei, Zhao, Yongfu, Zhang, Chaozhi, Liu, Fengling, Bao, Chunxiao, Lin, Mingyue
• Format: Journal Article
• Language: English
• Published: Oxford Elsevier B.V 15.05.2012; Elsevier
• Subjects: additives; Applied sciences; Aqueous solutions; Chemical engineering; Decomposition; Degradation; Exact sciences and technology; Gamma irradiation; gamma radiation; Gamma rays; Gaussian; LC–MS; Mathematical models; oxidation; Quantum chemistry; Reactors; Sulfadiazine; Sulfadiazine; Gamma irradiation; Gaussian; LC–MS; Kinetic model; Additive; LC-MS; Hydrogen peroxide; First order; Fenton reaction; Oxidation; Aqueous solution; Modeling
• ISSN: 1385-8947; 1873-3212
• DOI: 10.1016/j.cej.2012.03.012

► We have evaluated the feasibility on SD removal using gamma irradiation. ► We systemically investigated the effect of different additives on SD removals. ► SD removals were mainly controlled by OH oxidation and SD direct decomposition. Gamma irradiation-induced removal of sulfadiazine (SD) under different conditions was investigated. The results show that SD can be effectively degraded using gamma irradiation. The removal efficiencies of low-concentration SD can be remarkably improved in an acid solution, and SD degradation was in accordant with the pseudo-first-order kinetic model. The additives, such as H2O2 and Fenton reagent, were favorable for removing SD during gamma irradiation. However, SD removal was restrained with the addition of Na2CO3. Adding CH3OH in solution, we found that SD removal was restrained at low-irradiation dose while markedly promoted at high-irradiation dose. Based on the results of quantum chemical calculations and LC–MS analysis, SD degradation using gamma irradiation in aqueous solution is mainly ascribed to OH oxidation and the direct decomposition of SD molecules.