Efficient photodegradation of levofloxacin by g-C3N4/BiVO4 modified with carbon quantum dots from corn stalk
OU Xiaoxia
WEI Menglan
WANG Yimeng
TENG Fei
Abstract：A simple hydrothermal synthesis method was successfully employed to incorporate corn stover-derived biomass carbon quantum dots(CQDs)into the g-C3N4/BiVO4(CN/BVO)system.The materials were systematically characterized by X-ray diffraction,Fourier transform infrared spectroscopy,scanning electron microscopy,UV-Vis diffuse reflectance spectroscopy,photoluminescence and electrochemical a-nalysis to investigate their microstructure,morphology,composition and photoelectrochemical properties.Results showed that the C20-CN/BVO composite with 20 mg CQDs loading achieved 89.1％removal effi-ciency for levofloxacin(LEV)under simulated sunlight irradiation within 180 minutes.Its kinetic constant was 1.6,1.8 and 1.9 times higher than those of pure g-C3N4,BiVO4 and CN/BVO,respectively.Three-dimensional excitation-emission matrix fluorescence spectroscopy visually revealed the photocatalytic deg-radation process of LEV.Mechanism studies indicated that photogenerated holes were the primary active species in LEV degradation.Combining radical quenching experiments and band structure analysis,a sol-id-state Z-scheme charge transfer mechanism was proposed.This study provides novel insights for desig-ning g-C3N4-based heterojunction photocatalysts and offers an innovative solution for efficient and green governance of antibiotic pollution,holding promising potential to advance technological progress in this field.
Keywords：g-C3N4BiVO4biomass carbon quantum dotslevofloxacinphotocatalysis
Publication Date：2025-12-31
Online Publishing Date：2026-08-28(First online date of this platform, not the publication date of the document)
Pages：11( 935-944,后插1-后插2 )