期刊
PROGRESS IN NATURAL SCIENCE-MATERIALS INTERNATIONAL
卷 29, 期 2, 页码 138-144出版社
ELSEVIER SCIENCE INC
DOI: 10.1016/j.pnsc.2019.03.004
关键词
Nanophotocatalyst; Charge separation; CO2 reduction; Pollutant degradation
The photocatalytic activities of g-C3N4 can be significantly improved by increasing life time of the photo-generated charges. Here, in this work we introduced TiO2 as proper energy platform to accept the photo-generated electrons from g-C3N4 during photocatalysis. The nanophotocatalysts formed from the combination of a suitable amount of TiO2 nanoparticles and g-C3N4 nanosheets showed 8.75 and 4.22% enhancement in photocatalytic activities for CO2 reduction and 2-chlorophenol (2-CP) degradation under visible light illumination as compared to bare g-C3N4. Based on the surface photovoltage spectra, photoluminescence spectra and examination of formed hydroxyl radicals, it was confirmed that these enhanced photoactivities were attributed to the much-improved charge separation via the electron transfer from g-C3N4 to TiO2. From trapping experiments, it was found that hydroxyl radicals were the major species involved in the photocatalytic degradation of 2-CP. This study is helpful to synthesize efficient photocatalysts to cope with energy and environmental issues.
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