Journal
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
Volume 317, Issue -, Pages 151-160Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jphotochem.2015.11.008
Keywords
Sol-gel method; g-C3N4/TiO2 composite; Heterojunction; Extended absorption range; Photocatalytic performance
Categories
Funding
- National Natural Science Foundation of China [61404046, 21275039]
- Fundamental Research Funds for the Central Universities [531107040415]
- Science and Technology Planning Project of Hunan Province, China [2014GK3093]
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Not only for utilizing both ultraviolet (UV) and visible light but also for enhancing photoinduced carriers separation capability, a composite photocatalyst composed of graphite-like carbon nitride (g-C3N4) and TiO2 has been successfully prepared by an acetic acid assisted sol-gel method combined with calcination process. The as-prepared g-C3N4/TiO2 composite photocatalyst was characterized by using XRD, SEM, TEM, XPS, FF-IR spectra, UV-DRS and TGA. Combined XRD results with SEM images, it indicated that the obtained anatase TiO2 nanoparticles dispersed well on the surface of g-C3N4 sheets and the aggregation degree of TiO2 nanoparticles could be effectively alleviated due to the introduction of g-C3N4. The results of UV-DRS further displayed that the optical absorption edge of g-C3N4/TiO2 composites had an obvious red shift to the longer wavelength in comparison with pure TiO2. Profiting from the above-mentioned advantages, g-C3N4/TiO2 composite showed excellent photocatalytic performance. Under visible light irradiation, all g-C3N4/TiO2 composite samples had more excellent photodegradation performance than pure g-C3N4 or TiO2, and the pseudo-first-order kinetic constant of methyl orange (MO) degradation on optimal g-C3N4/TiO2 composite was 2.80 times as great as that on pure g-C3N4. The photodegradation performance of optimal g-C3N4/TiO2 composite was also investigated under UV-vis light irradiation. Compared with the pure phase (TiO2 or g-C3N4), the composite photocatalytic capability was remarkably enhanced by coupling TiO2 with g-C3N4, which mainly benefited from the effective separation of photoinduced electron-hole pairs and the extended optical absorption range, both owing to the heterojunction built-in between g-C3N4 and TiO2. (C) 2015 Elsevier B.V. All rights reserved.
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