The Oxidation and Immobilization of As(III) by Colloidal Ferric Hydroxide in the Concomitant Pollution of Oxytetracycline,ACS ES&T Engineering

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The Oxidation and Immobilization of As(III) by Colloidal Ferric Hydroxide in the Concomitant Pollution of Oxytetracycline
ACS ES&T Engineering ( IF 7.4 ) Pub Date : 2023-02-06 , DOI: 10.1021/acsestengg.2c00367
Yunping Tong _{1,

2} , Xiaolei Wang ₁ , Xinghao Wang ₁ , Zhaoyue Sun ₁ , Guodong Fang ₁ , Juan Gao ₁

Affiliation

The concomitant pollution of arsenic and antibiotics has commonly occurred in the environments recently, the behaviors of which may be different from single existence. Colloidal ferric hydroxide (CFH) is ubiquitous, existing in surface waters, seawaters, sediments, and paddy soils. In this study, the interaction between oxytetracycline (OTC) and CFH facilitated OTC degradation and reduced Fe(III) to Fe(II). In oxic conditions, the reactions between dissolved oxygen (DO) and Fe(II) generated reactive oxygen species (ROS). ^•OH and O₂^•– were the main free radicals through electron paramagnetic resonance (EPR) measurement, and 8.1 ± 0.5 μM ^•OH was detected after 48 h of reaction. Quenching experiments indicated that ^•OH had dominated the oxidation of As(III). Furthermore, ferric arsenate formed after the oxidation of As(III) to As(V), which greatly decreased As(III) risks in the environment. The transformation of As(III) was also observed with other iron oxides or different antibiotics. The results of this study proved the facilitation of residual antibiotics in the redox process of iron oxides and transformation of co-existing pollutants, which extended our understanding on the roles of organic pollutants in combined contamination.

中文翻译：

土霉素并发污染中胶体氢氧化铁对 As(III) 的氧化和固定化

近年来，环境中普遍存在砷和抗生素的伴随污染，其行为可能不同于单独存在。胶体氢氧化铁 (CFH) 无处不在，存在于地表水、海水、沉积物和水稻土中。在这项研究中，土霉素 (OTC) 和 CFH 之间的相互作用促进了 OTC 降解并将 Fe(III) 还原为 Fe(II)。在含氧条件下，溶解氧 (DO) 和 Fe(II) 之间的反应会产生活性氧 (ROS)。^• OH 和O ₂^•–通过电子顺磁共振(EPR) 测量是主要的自由基，反应48 小时后检测到8.1 ± 0.5 μM ^{• OH。}淬火实验表明^•OH 主导了 As(III) 的氧化。此外，砷酸铁在 As(III) 氧化为 As(V) 后形成，大大降低了 As(III) 在环境中的风险。用其他氧化铁或不同的抗生素也观察到 As(III) 的转化。这项研究的结果证明了残留抗生素在氧化铁的氧化还原过程和共存污染物转化过程中的促进作用，扩展了我们对有机污染物在复合污染中的作用的理解。

更新日期：2023-02-06

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