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.
Meso-N-TiO 2 nanocatalysts (Nx-MT) were successfully synthesized through evaporation-induced self-assembly (EISA) method by using urea as the nitrogen source and Pluronic F127 as the templating agent. Through a series of characterizations and degradation of rhodamine B under simulated sunlight, the roles of mesoporous and N-doping in the Nx-MT nanocatalyst were evaluated. The Nx-MT exhibited enhanced photocatalytic activity due to the comprehensive effect of mesopores and N-doping. The effects of calcination temperature and N concentration on the performance of the catalyst were studied. Besides, the relationship between the pore volume of Nx-MT and the catalytic reaction rate was clarified. Moreover, the turnover number (TON) was used to evaluate the effect of the amount of nitrogen doping on the catalytic activity per active site.
A green and efficient photocatalyst based on C and N co-doped titanium based nanorods (NRs) was prepared by facile hydrothermal synthesis and interlaminar bonding interaction between layered -Ti O 3 7 2 and tetramethylammonium hydroxide (TMAH). TMAH as one of quaternary ammoniumbased compounds was used as the doping source of C and N elements. The results showed that C and N co-doping did not affect the anatase crystal structure of TiO 2 NRs. C, N-TiO 2 NRs showed excellent photocatalytic activity for degrading methyl orange under simulated sunlight irradiation. In particular, the 20:1 TiO 2 NRs catalyst showed the best catalytic performance, showing efficient photocatalytic rate of 90%. The photocatalytic reaction kinetics of undoped and doped catalysts was also studied. In addition, reactive species (RSs) experiments showed that hydroxyl radical ( · OH), superoxide radical anions ( · O 2 −) and photogenerated holes (h + ) were major active species during the photocatalytic process. The mechanisms of the electrostatic attraction and potential photocatalytic degradation were proposed and discussed.
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