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首页> 外文期刊>RSC Advances >Zero-valent iron/activated carbon microelectrolysis to activate peroxydisulfate for efficient degradation of chlortetracycline in aqueous solution
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Zero-valent iron/activated carbon microelectrolysis to activate peroxydisulfate for efficient degradation of chlortetracycline in aqueous solution

机译：零价熨斗/活性炭微电解，用于活化过氧硫酸盐，以便在水溶液中有效降解碳裂解素

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Tetracycline antibiotics are widely used in human and veterinary medicine; however, their gradual increase in the aquatic environment poses a serious threat to human health and ecosystems. The reactivity of peroxydisulfate (PDS) in the degradation of chlortetracycline (CTC) in aqueous solution using a zero-valent iron/activated carbon (AC) microelectrolysis method (Fe ~(0) –AC/PDS) was investigated by batch experiments. The results showed that the effects of different systems were as follows: Fe ~(0) –AC/PDS > Fe ~(0) /PDS > AC/PDS > Fe ~(0) –AC > AC > Fe ~(0) > PDS. In the Fe ~(0) –AC/PDS system, the degradation efficiency of CTC could reach 88% under the following optimal experimental conditions: Fe ~(0) dose of 0.4 g L ~(?1) , PDS dose of 2 g L ~(?1) , pH of 3 and initial CTC concentration of 50 mg L ~(?1) . The presence of Cl ~(?) , HCO _(3) ~(?) and H _(2) PO _(4) ~(?) inhibited the degradation of CTC, while humic acid accelerated the degradation rate of CTC. The mineralization of CTC was evaluated from the TOC, with a value of 31.44% in 7 h. Free radical identification experiments showed that SO _(4) ~(?) ˙ and O _(2) ~(?) ˙ were involved in the degradation of CTC. The iron and carbon materials had good reusability, and the degradation rate of CTC was still approximately 70% after four cycles. Finally, the possible mechanism for the degradation of CTC by the Fe ~(0) –AC/PDS systems was discussed. Based on the above conclusions, Fe ~(0) –AC microelectrolysis is a new heterogeneous catalytic method for green and efficient activation of PDS and demonstrates potential applicability in the treatment of wastewater.
机译：四环素抗生素广泛用于人类和兽医学;然而，他们对水生环境的逐步增加对人类健康和生态系统构成了严重的威胁。通过分批实验研究了使用零价熨斗/活性炭（AC）微电解方法（Fe〜（0）-Ac / Pds）的水溶液中碳氢盐（CTC）降解的过氧硫酸盐（PDS）的反应性。结果表明，不同系统的影响如下：Fe〜（0）-ac / Pds> Fe〜（0）/ PDS> AC / PDS> Fe〜（0）-Ac> AC> Fe〜（0） > PD。在Fe〜（0）-ac / PDS系统中，CTC的降解效率在以下最佳实验条件下可达到88％：Fe〜（0）剂量为0.4g l〜（α1），PD剂量为2g l〜（α1），pH为3，初始CTC浓度为50mg l〜（α1）。 Cl〜（α），HCO _（3）〜（？）和H _（2）PO _（4）〜（α）抑制CTC的降解，而腐殖酸加速了CTC的降解率。从TOC评价CTC的矿化，7小时内值为31.44％。自由基鉴定实验表明，如此_（4）〜（？）˙和o _（2）〜（？）˙涉及CTC的降解。铁和碳材料具有良好的可重用性，并且在四个循环后CTC的降解速率仍然约为70％。最后，讨论了Fe〜（0）-Ac / PDS系统通过CTC降解CTC的可能机制。基于上述结论，Fe〜（0）-Ac微电子是一种新的异质催化方法，用于绿色和有效活化的PD，并证明了在废水处理中的潜在适用性。

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