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Photodegradation of Phenol over TiO2-SiO2 Catalysts Prepared by Sol-gel Method

졸-겔법으로 제조한 TiO2-SiO2촉매에서 페놀의 광분해 반응

  • 홍성수 (부경대학교 화학공학부) ;
  • 이만식 (부경대학교 화학공학부) ;
  • 이근대 (부경대학교 화학공학부) ;
  • 주창식 (부경대학교 화학공학부)
  • Published : 2002.06.01

Abstract

Photocatalytic degradation of phenol was carried out with UV-illuminated TiO$_2$-SiO$_2$ in aqueous suspension. TiO$_2$-SiO$_2$ catalysts were prepared by sol-gel method from the titanium isopropoxide and tetraethylorthosilicate at different Ti/Si ratio and some commercial TiO$_2$ 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$_2$-SiO$_2$(49: 1) prepared by sol-gel method showed higher activity than commercial TiO$_2$catalysts on the photocatalytic degradation of phenol. The addition of SiO$_2$ into TiO$_2$hepled 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.

Keywords

Photocatalytic degradation;Phenol;TiO$_2$-SiO$_2$;Sol-gel method

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