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Electrocatalytic dechlorination of halogenated antibiotics via synergistic effect of chlorine-cobalt bond and atomic H
- Liu, Tian, Luo, Jinming, Meng, Xiaoyang, Yang, Liming, Liang, Bin, Liu, Meijun, Liu, Chengbin, Wang, Aijie, Liu, Xia, Pei, Yong, Yuan, Jili, Crittenden, John
- Journal of hazardous materials 2018 v.358 pp. 294-301
- antibiotics, dechlorination, electric power, electrodes, electron paramagnetic resonance spectroscopy, florfenicol, mercurous chloride, remediation, synergism
- Although noble metal electrocatalysts are highly efficient in the dehalogenation of halogenated antibiotics, the prohibitive cost hinders their practical applications. In this study, a cobalt-phosphorous/oxide (CoP/O) composite prepared via a one-step electrodeposition was for the first time applied in electroreductive dechlorination of halogenated antibiotics (HA), including chloramphenicol (CAP), florfenicol (FLO) and thiamphenicol (TAP). CoP/O had a higher FLO dechlorination efficiency (91%) than Pd/C (69.3%) (t = 60 min, C0 = 20 mg L−1, applied voltage of −1.2 V vs. saturated calomel electrode (SCE)). Furthermore, the dechlorination efficiencies of CoP/O for CAP and TAP reached to 98.7 and 74.2%, respectively. The electron spin resonance and in situ Raman characterizations confirmed that atomic H* was produced via the CoP and the formation of CoCl bonds occurred on the CoO in CoP/O. The CoCl bond formation could trap HA molecules onto CoP/O and weaken the CCl bond strength. The synergistic effect of H* attack and CoCl bond was responsible for the high dechlorination efficiency. This study offers new insights into the interface mechanism of electroreductive dehalogenation process, and shows a great potential for the remediation of halogenated antibiotics contaminated wastewater.