Simultaneous Degradation, Dehalogenation, and Detoxification of Halogenated Antibiotics by Carbon Dioxide Radical Anions

• DOI: 10.1016/j.eng.2024.03.006
• Publication Date: 2024-03-27T04:17:31Z
• Authors: Yanzhou Ding; Xia Yu; Shuguang Lyu; Huajun Zhen; Wentao Zhao; Cheng Peng; Jiaxi Wang; Yiwen Zhu; Chengfei Zhu; Lei Zhou; Qian Sui
• Keywords: Moiety; Detoxification; Hydroxyl radical

Despite the extensive application of advanced oxidation processes (AOPs) in water treatment, efficiency AOPs eliminating various emerging contaminants such as halogenated antibiotics is constrained by a number factors. Halogen moieties exhibit strong resistance to oxidative radicals, affecting dehalogenation and detoxification efficiencies. To address these limitations AOPs, reduction (ARPs) have been proposed. Herein, novel nucleophilic reductant—namely, carbon dioxide radical anion (CO2•-)—is introduced for simultaneous degradation, dehalogenation, florfenicol (FF), typical antibiotic. The results demonstrate that FF completely eliminated CO2•-, with approximately 100% Cl- 46% F- released after 120 min treatment. Simultaneous observed, which exhibits linear response release free inorganic halogen ions (R2 = 0.97, p < 0.01). formation halogen-free products primary reason superior performance this method, comparison conventional hydroxyl-radical-based AOPs. Products identification density functional theory (DFT) calculations reveal underlying mechanism, chlorine moiety more susceptible than other attack CO2•-. Moreover, CO2•--based ARPs efficiencies (> 75%) degrading series antibiotics, including chloramphenicol (CAP), thiamphenicol (THA), diclofenac (DLF), triclosan (TCS), ciprofloxacin (CIP). system shows high tolerance pH solution presence natural constituents, demonstrates an excellent degradation actual groundwater, indicating potential real life. Overall, study elucidates feasibility CO2•- provides promising method their regulation during or wastewater