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Antibiotics, especially halogenated antibiotics, which account for nearly 40% of the total antibiotics in China, pose great environmental risks; however, the superior stability of C-F bond and low concentrations hinder their degradation, indicating the need for developing of highly efficient treatment technologies. There is an additional concern that some degradation products could be as active/toxic as or even more than their parent compound. The stable C-F bond can be relative easily cleaved by UV light irradiation, which could come from sunlight. Herein, a novel UV-driven electro-Fenton catalytic membrane (UV-EFCM) filtration system that favors resistance elimination and efficient degradation of low-concentration antibiotics is proposed for the first time. The photoelectrochemical/electro-Fenton (PEC/EF) coupling reaction is synchronously conducted in a sequential filtration system. Almost complete degradation and high mineralization (78.4 +/- 9.1%) of florfenicol were achieved at a concentration of as low as 14 mu M with the hydraulic retention time of 0.98 h during the UV-EFCM filtration system. Complete elimination of its antibacterial activity, and significant defluorination improvement (56 +/- 3.6%) compared to electro-Fenton filtration process (11 +/- 5.3%) were achieved due to the prior cleavage of the stable C-F bond with antibiotic potency under UV light pretreatment. This study thus proposes a novel UV-EFCM filtration system, which couples PEC and EF with a potential to tackle the environmental problems associated with antibiotic pollution.
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