A new perspective on contaminants as "activators": Aromatic amine groups promoted degradation of tetracycline by ferrate(VI),Journal of Hazardous Materials

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A new perspective on contaminants as "activators": Aromatic amine groups promoted degradation of tetracycline by ferrate(VI)
Journal of Hazardous Materials ( IF 12.2 ) Pub Date : 2024-09-03 , DOI: 10.1016/j.jhazmat.2024.135740
Jinhu Guo ₁ , Shutao Wang ₁ , Tiecheng Li ₁ , Lu Wang ₁ , Hong You ₁

Affiliation

Occasionally, our group found that the degradation of tetracycline by ferrate(VI) could be promoted by four co-exist contaminants, containing aromatic amines (ofloxacin, diatrizoic acid, sulfadiazine and alachlor). This study investigated the promotion of aromatic amine groups on tetracycline degradation by ferrate(VI) by using aniline as a model compound. The results implied that the presence of aniline increased the degradation rate of tetracycline by 2.76 times, and the enhancement was weakened gradually with the decrease of pH from 10 to 7.5. The generation of Fe(IV) and·OH by the reaction between ferrate(VI) and aniline was proposed to enhance the degradation of tetracycline, supported by quenching experiments, electron paramagnetic resonance (EPR) and theoretical calculations. A positive correlation was found between the rate constant of tetracycline degradation and the electron-donating ability of the substituted amines (quantified by the Hammett substituent constants). In addition, the degradation of tetracycline was remarkably inhibited by HA and some inorganic ions such as NO3-, SO42-, Cl-, Ca2+, and Mg2+, and the inhibition also happened in the Songhua River water and the secondary effluent. The present study provided an insight into the complex oxidation process for the degradation of micropollutants containing aromatic amine by ferrate in water treatment.

中文翻译：

将污染物视为“活化剂”的新视角：芳香胺基团促进铁酸盐降解四环素（VI）

有时，我们小组发现铁酸盐（VI）对四环素的降解可以被四种共存的污染物（氧氟沙星、泛影酸、磺胺嘧啶和甲草胺）促进。本研究以苯胺为模型化合物，研究了芳香胺基团对铁酸盐（VI）降解四环素的促进作用。结果表明，苯胺的存在使四环素的降解速率提高了 2.76 倍，并且随着 pH 值从 10 降低到 7.5，这种增强逐渐减弱。Fe（IV）和 ·在淬灭实验、电子顺磁共振（EPR）和理论计算的支持下，提出通过铁酸盐（VI）和苯胺反应的 OH 来增强四环素的降解。发现四环素降解的速率常数与取代胺的电子供体能力（由 Hammett 取代基常数量化）之间存在正相关。此外，HA 和一些无机离子如 NO3-、SO42-、Cl-、Ca2+ 和 Mg2+ 对四环素的降解受到显著抑制，在松花江水域和二次流出中也发生抑制作用。本研究为水处理中含芳香胺的微污染物降解含芳香胺的复杂氧化过程提供了见解。

更新日期：2024-09-03

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