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Indian Journal of Chemistry -Section A (IJC-A) >
IJC-A Vol.49A [2010] >
IJC-A Vol.49A(07) [July 2010] >
| Title: | Structural studies of silica modified titania and its photocatalytic activity of 4-chlorophenol oxidation in aqueous medium |
| Authors: | Raj, K Joseph Antony
Smith, York R
Subramanian, Vaidyanathan (Ravi)
Viswanathan, B |
| Keywords: | Catalysis
Photocatalysis
Amorphous materials
Titania
Oxidations
Oxides |
| Issue Date: | Jul-2010 |
| Publisher: | CSIR |
| IPC Code: | Int. Cl.9 B01J21/00; C07B33/00 |
| Abstract: | A series of titania samples with different
loadings of silica (0.5-10 wt.%) has been prepared by wet impregnation method.
The presence of Ti-O-Si linkage for all silica loadings has been confirmed by
DRIFT spectra. High dispersion of silica in the titania matrix and the bonding
of Ti-O-Si in silica-titania samples are found to inhibit the transformation
of amorphous to anatase titania. The UV-vis/DRS show an increase in UV and
visible light absorbance for 7.5 wt.% silica calcined at 500 °C. Evaluation of photocatalytic
activity of the samples for the decomposition of 4-chlorophenol shows greater
activity for samples modified with silica with an optimal loading of 7.5 wt.%
silica calcined at 500 °C. Conversion of 90 % and 35 % of 4-chlorophenol for UV-visible and
visible light respectively is observed. Photocatalytic activity of the
silica-titania samples is found to decrease with increasing crystallinity. |
| Page(s): | 867-875 |
| Source: | IJC-A Vol.49A(07) [July 2010]
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