Journal
APPLIED SURFACE SCIENCE
Volume 279, Issue -, Pages 384-390Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apsusc.2013.04.121
Keywords
TiO2/SiO2; Hydrolysis; Photocatalyst; Acid orange
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Funding
- Operational Programme 'Education for competitiveness' [CZ.1.07/2.3.00/20.0074]
- European Union
- state budget of the Czech Republic
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TiO2/SiO2 composites were produced as photocatalysts both by hydrolysis of TiCl4 and from TiO2 suspension prepared by hydrolysis of TiCl4. TiO2/SiO2 composites were dried at 70 degrees C and calcinated at 400 degrees C and 600 degrees C to investigate the effect of calcination temperature on the phase transformation of TiO2 structure. Photocatalytic effects of produced TiO2/SiO2 composites were measured against degradation of acid orange 7 (AO7) by UV-vis spectroscopy. The chemical compositions of produced samples were studied by X-ray fluorescence (XRF) technique. The composite structures were analyzed by X-ray diffraction (XRD) pattern and scanning electron microscopy (SEM) facilities to reveal the surface morphology and their phase structures. Energy dispersive X-ray spectroscopy (EDS) was conducted to understand the elemental surface composition of composites. Photocatalytic activity of composites normalized with surface area, and TiO2/SiO2 composite produced by TiO2 suspension prepared by hydrolysis of TiCl4 and calcinated at 600 degrees C indicated 40% photocatalytic degradation of AO7 after 2 h under UV radiation. (C) 2013 Elsevier B.V. All rights reserved.
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