Catalytic degradation of chloramphenicol by water falling film dielectric barrier discharge and FeO catalyst

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Herein, chloramphenicol (CAP) antibiotic was degraded by water falling film dielectric barrier discharge (WFFDBD) and FeO catalyst. The treatment performance and catalytic mechanisms were studied by experiments and density functional theory (DFT) simulations. The results show that 69.5% of CAP was degraded by WFFDBD at 8 min, and the degradation efficiency increased to 97.7% by WFFDBD/FeO at the same treatment time. The formation of OH caused by the catalytic reactions was mainly responsible for the catalytic effect. The electron transfer from FeO to the antibonding orbits of O3, H2O2 and dissolved oxygen was the key for the catalytic reactions, which promoted their decomposition and transformation. Dissolved oxygen was converted to O2.- that adsorbed on FeO by the electron transfer, which played an important role for the catalytic process. Oxygen vacancies raised the charge density of Fe and accelerated the electron transfer. Fe near the oxygen vacancies achieved the dissociated adsorption of H2O2 and O3, and transformed dissolved oxygen to O22- due to the enhancement of the electron transfer.