The limited absorption of visible light and high recombination rate of photogenerated electron-hole pairs impede the practical application of CeVO4 in photocatalysis.The unique π-conjugated structure of carbon dots(CDs)endows them with exceptional capabilities for the storing and transferring photogenerated electrons.Herein,CDs/CeVO4 was successfully synthesized by two-step method of hydrothermal and co-precipitation,resulting in a significant enhancement of photogenerated carrier transfer and separation efficiency with the incorporation of CDs.Under visible light irradiation,CDs/CeVO4 exhibit enhanced activity towards peroxymonosulfate(PMS)for the degradation of tetracycline hydrochloride(TC),resulting in a 90％degradation rate of TC after 60 min of reaction.The reaction rate constant is 4.1 times higher than that of CeVO4.XPS,UV-Vis DRS,and time-resolved fluorescence spectra demonstrate that CDs/CeVO4 exhibits a narrower band gap,an enhanced capacity for absor-bing visible light,and a 15.1-fold increase in the fluorescence lifetime compared to CeVO4.The results of electron paramagnetic resonance(EPR)and XPS tests confirm the presence of abundant oxygen vacancies in CDs/CeVO4,thereby further enhancing their capacity for activating PMS.Capture experiments of active substances show that h+,SO4-·and·OH are the active species in the reaction system,and a plausible degradation mechanism was proposed.After five cycles of experiments,the degradation rate decreased slightly,showing good photocatalytic performance.This work provides a new strategy for the degradation of organic pollutants in wastewater.
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