Visible Light Driven VO2/g-C3N4 Z-Scheme Composite Photocatalysts for Selective Oxidation of DL-1-Phenylethyl Alcohol under Vis-LEDs Irradiation and Aerobic Oxidation

摘要

A novel VO2/g-C3N4 Z-Scheme type heterostructure composite photocatalyst was fabricated by the ultrasonic-assisted method. The newly synthesized photocatalyst has been systematically and comprehensively characterized and analyzed. Through the selective oxidation of DL-1-Phenylethyl alcohol under Vis-LED irradiation and aerobic oxidation, the photocatalytic performance of VO2/g-C3N4 photocatalyst was investigated. The results showed that the prepared VO2/g-C3N4 nanocomposites exhibited excellent photocatalytic oxidation performance. Among them, the highest turnover frequency (TOF) was 0.42 mmol (DL-1-Phenylethyl alcohol).mmol(-1) (catalyst).h(-1), which was 5 times higher than the TOF of the original g-C3N4. The effects of different wavelengths of LED monochromatic light, the composite ratio of VO2 and g-C3N4, the reaction time, and the different benzyl alcohol substrates were studied. Also, catalyst life test was completed. Furthermore, a persuasive mechanism of photocatalytic selective oxidation of DL-1-Phenylethyl alcohol on VO2/g-C3N4 photocatalyst was proposed through EPR and radical trapping experiments.