In this study, gamma radiation was used for triclosan (TCS) degradation with addition of persulfate (PS) to enhance the mineralization of TCS. The influence of absorbed doses, PS concentration, and initial pH value on TCS degradation and mineralization was examined. The results showed that the degradation and mineralization of TCS were remarkably enhanced in the presence of PS. With addition of 1.5 mM PS, 8 mg/L TCS could be completely degraded at 300 Gy, which was much lower than that of the control group without PS (600 Gy). Furthermore, with addition of PS, higher mineralziaiton of TCS could be observed. The intermediates produced during the decomposition of TCS were identified and the possible degradation pathway was proposed. In addition, the biodegradability of TCS solution, as well as the intermediate products, was evaluated by a Wabo micro-respiration tester for 12 h. It demonstrated that the biodegradability of TCS solution increased after gamma radiation, which could be further enhanced by persulfate, suggesting that the combination of gamma radaition with persulfate could be a promising alternative process for the degradation of antibiotics in the wastewater.

中文翻译：

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添加过硫酸盐通过伽马辐射增强三氯生的降解


在这项研究中，伽马辐射用于三氯生 (TCS) 降解，并添加过硫酸盐 (PS) 以增强 TCS 的矿化。研究了吸收剂量、PS 浓度和初始 pH 值对 TCS 降解和矿化的影响。结果表明，PS 存在下，TCS 的降解和矿化显着增强。添加1.5 mM PS后，8 mg/L TCS在300 Gy下即可完全降解，远低于未添加PS的对照组（600 Gy）。此外，添加 PS 后，可以观察到 TCS 的矿化度更高。鉴定了 TCS 分解过程中产生的中间体，并提出了可能的降解途径。此外，TCS溶液以及中间产物的生物降解性通过Wabo微呼吸测试仪评估12小时。结果表明，伽马辐射后 TCS 溶液的生物降解性增加，过硫酸盐可以进一步增强这种生物降解性，这表明伽马辐射与过硫酸盐的组合可能是废水中抗生素降解的一种有前景的替代工艺。