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KMID : 1024520020110060597
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Journal of the Environmental Sciences
2002 Volume.11 No. 6 p.597 ~ p.603
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Photodegradation of Phenol over TiO₂-SiO₂ Catalysts Prepared by Sol-gel Method
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Hong Seong-Su
Lee Man-Sig
Lee Gun-Dae
Ju Chang-Sik
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Abstract
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Photocatalytic degradation of phenol was carried out with UV-illuminated TiO-SiO in aqueous suspension. TiO-SiO catalysts were prepared by sol-gel method from the titanium isopropoxide and tetraethylorthosilicate at different Ti/Si ratio and some commercial TiO catalysts were used as purchased. All catalysts were characterized by X-ray Diffraction(XRD) and BET surface area analyzer. The effect of reaction conditions, such as initial concentration of phenol, reaction temperature and catalyst weight on the photocatalytic activity was studied. In addition, TiO-SiO(49: 1) prepared by sol-gel method showed higher activity than commercial TiOcatalysts on the photocatalytic degradation of phenol. The addition of SiO into TiOhepled to increase the thermal stability of titania which suppressed the formation of anatase into rutile. The photocatalytic degradation of phenol showed pseudo-1st order reaction and the degradation rate increases with decreasing initial phenol concentration.
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KEYWORD
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TiO₂-SiO₂, Sol-gel method, Photocatalytic degradation, Phenol
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