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Combined modification of a TiO2 photocatalyst with two different carbon forms

AuthorsAnsón Casaos, Alejandro ; Tacchini, Ignacio; Unzue, Andrea; Martínez Fernández de Landa, María Teresa
KeywordsTitanium dioxide
Carbon nanotubes
Issue DateApr-2013
CitationApplied Surface Science 270 : 675-684 (2013)
AbstractHydrothermally synthesized titanate nanotubes were carbon-doped through a thermal treatment in the presence of glucose followed by blending with single-walled carbon nanotubes (SWCNTs). A series of TiO2-based materials was prepared with various initial glucose contents and two SWCNT types, resulting in total carbon contents from 0.3 wt.% to nearly 26 wt.%. Electron microscopy observations indicated that titanate nanotubes were converted into nanorods during the thermal treatment, and X-ray diffraction patterns confirmed that all the treated materials mostly consisted of anatase TiO2. Glucose pyrolisis caused changes in the infrared and X-ray photoelectron spectra of the titania material, indicating an interaction between the inserted carbon atoms and titanium atoms. Raman spectra of SWCNT/C/TiO2 hybrids showed characteristic bands of both the SWCNT and anatase TiO2 phases. SWCNT/C/TiO2 multicomponent materials demonstrated substantially better photocatalytic activities than P25 TiO2 for methylene blue degradation under visible light irradiation. Independently from its origin, the presence of carbon caused a strong increase in the TiO2 visible light absorption. However, the results obtained with the C/TiO2 and SWCNT/C/TiO2 photocatalysts clearly showed different photocatalysis mechanisms depending on the carbon form.
Description9 pages, 11 figures, 2 tables.- Available online 26 January, 2013
Publisher version (URL)http://dx.doi.org/10.1016/j.apsusc.2013.01.120
Appears in Collections:(ICB) Artículos
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