Please use this identifier to cite or link to this item: https://hdl.handle.net/10356/83828
Title: Facile fabrication and characterization of multi-type carbon-doped TiO2 for visible light-activated photocatalytic mineralization of gaseous toluene
Authors: Zhang, Li
Tse, Man Siu
Tan, Ooi Kiang
Wang, Yu Xi
Han, Mandi
Keywords: Toluene
Carbon-doped titanium dioxide
Issue Date: 2013
Source: Zhang, L., Tse, M. S., Tan, O. K., Wang, Y. X.,& Han, M. (2013). Facile fabrication and characterization of multi-type carbon-doped TiO2 for visible light-activated photocatalytic mineralization of gaseous toluene. Journal of Materials Chemistry A, 1(14), 4497-.
Series/Report no.: Journal of Materials Chemistry A
Abstract: Carbon-doped titanium dioxide (C-TiO2) nanoparticles were synthesized by conventional mild oxidation of precursor titanium carbide (TiC) at 350 °C for 2 to 50 hours and more aggressive oxidation at the higher temperature of 400 to 600 °C for 2 hours in air. XRD and TEM studies indicated the formation of nano-sized C-TiO2 with mixed anatase–rutile phases. With prolonged oxidation time or increase in oxidation temperature, an initial decrease in crystallite size was unveiled due to cracking of TiC grains, renucleation of TiO2 and diffusion of carbon atoms. Raman, FTIR and XPS measurements revealed the presence of graphite-like carbon and the coexistence of substitutional and interstitial carbon in the TiO2 lattice. This multi-type carbon doping either served as a photosensitizer or resulted in additional electronic states above the valence band of the TiO2 lattice, directly responsible for the red shift of the absorption edge in the UV-vis absorption spectrum. The band structure and possible visible light photocatalytic mechanism of the C-TiO2 were thus elucidated. The synthesized C-TiO2 nanoparticles demonstrated improved photocatalytic performance for the mineralization of gaseous toluene in comparison to commercial P25 TiO2 under visible light irradiation. The C-TiO2 nanoparticles prepared at higher oxidation temperature with shorter time exhibited a more pronounced enhancement than those prepared by the mild oxidation process, providing a facile method for large-scale production of C-TiO2 suitable for indoor photocatalytic applications.
URI: https://hdl.handle.net/10356/83828
http://hdl.handle.net/10220/41479
DOI: 10.1039/c3ta01366a
Rights: © Royal Society of Chemistry 2016.
Fulltext Permission: none
Fulltext Availability: No Fulltext
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