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首页> 外文期刊>Chemical engineering journal >Synergistic degradation of antibiotic sulfadiazine in a heterogeneous ultrasound-enhanced Fe°/persulfate Fenton-like system
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Synergistic degradation of antibiotic sulfadiazine in a heterogeneous ultrasound-enhanced Fe°/persulfate Fenton-like system

机译：超声强化Fe°/过硫酸盐芬顿样体系中抗生素磺胺嘧啶的协同降解

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摘要

In this study, a novel ultrasound-enhanced heterogeneous Fe~0/persulfate (US/Fe~0/PS) system was developed and investigated for the degradation of an antibiotic sulfadiazine (SD). It was demonstrated that the US/Fe~0/PS system could achieve a significant synergy in the degradation efficiency of SD, as compared to its corresponding comparative systems. The SD degradation in the US/Fe~0/PS system could be applied by the pseudo-first-order kinetic with a K_(obs) (SD) value of 3.4 ± 0.20 h~(-1). Affecting factors such as initial pH, dosage ratio of [Fe~0]:[PS], US input power and reaction temperature were further studied. SD could be effectively degraded with a relatively low PS dosage at a broad pH range of 3-7. Simultaneous evolution of soluble iron species and PS was evaluated in three comparative systems (US/Fe°, Fe°/PS and US/Fe°/PS) during the reaction. It could be concluded that the promotional role of US would be dual in the US/Fe°/PS system, i.e. enhancement in the heterogeneous iron corrosion reactions and acceleration in the bulk radical reactions. Identification of the degradation intermediates indicated that sulfate radical (SO4~(·-)) oxidation was the main SD degradation pathway. Attacking of the amine group in the benzene ring would be its first step, followed by cleavage of C-N bonds in the heterocyclic ring. Another degradation pathway, i.e. direct cleavage of the S-N bond should be also present.
机译：在这项研究中，开发了一种新型的超声增强异质Fe〜0 /过硫酸盐（US / Fe〜0 / PS）系统，并研究了其对抗生素磺胺嘧啶（SD）的降解作用。结果表明，与相应的比较系统相比，US / Fe〜0 / PS系统可以在SD的降解效率上实现明显的协同作用。在US / Fe〜0 / PS系统中，SD的降解可以通过拟一阶动力学来实现，其K_（obs）（SD）值为3.4±0.20 h〜（-1）。考察了初始pH值，[Fe〜0]：[PS]的用量比，US输入功率和反应温度等影响因素。在3-7的宽pH范围内，以相对较低的PS剂量可以有效降解SD。在反应过程中，在三个比较系统（US / Fe°，Fe°/ PS和US / Fe°/ PS）中评估了可溶性铁物种和PS的同时释放。可以得出结论，在US / Fe°/ PS体系中，US的促进作用将是双重的，即，增强非均质铁腐蚀反应和促进大量自由基反应。降解中间体的鉴定表明，硫酸根（SO4〜（·-））的氧化是SD降解的主要途径。苯环中胺基的攻击将是其第一步，然后裂解杂环中的C-N键。还应该存在另一种降解途径，即S-N键的直接裂解。

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