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TiO2 immobilized on SiO2 (TiO2 /SiO2 ) have been prepared by sol-gel method and various ions of transition metals (Cr3+ , Co2+ , Ni2+ , Cu2+ , and Zn2+ )weredoped on the photocatalyst usingwet impregnation method under reducing calcination atmosphere. The photocatalytic activity of metaldoped TiO2 /SiO2 towards phenoldegradation under black light irradiationwere investigated and comparedwith undoped TiO2 /SiO2 . The results showed that the photoresponse of Cu2+ and Zn2+doped TiO2 /SiO2were larger than undoped TiO2 /SiO2 , indicating that the photogenerated carrierswere separated more efficiently in Cu2+ and Zn2+doped TiO2 /SiO2 . The reactivitywas in the order of Cu2+ > Zn2+ > Ni2+ > Cr3+ > Co2+ . Thedifferent photoreactivitywas ascribed to combine effect of thedifferent ionic radii and photocorrison tendency of thedopants. The samplewas also characterized by surface analytical methods such as X-raydiffraction, scanning electron micrograph/electrondispersive X-ray analyzer and UV-Vis absorption spectrum.
TiO2 immobilized on SiO2 (TiO2 / SiO2) have been prepared by sol-gel method and various ions of transition metals (Cr3 +, Co2 +, Ni2 +, Cu2 +, and Zn2 +) weredoped on the photocatalyst using the impregnation method under reducing calcination atmosphere. The photocatalytic activity of metal doped TiO2 / SiO2 towards phenol degradation under black light irradiationwere investigated and comparedwith undoped TiO2 / SiO2. The results showed that the photoresponse of Cu2 + and Zn2 + doped TiO2 / SiO2were larger than undoped TiO2 / SiO2, indicating that the photogenerated carrierswere separated morefficient in The reactivity was in the order of Cu2 +> Zn2 +> Ni2 +> Cr3 +> Co2 +. Thedifferent photoreactivitywas ascribed to combine the effect of thedifferent ionic radii and photocorrison tendency of thedopants. The samplewas also characterized by surface analytical methods such as X-raydiffraction, scanning electron micrograph / electron dispersive X-ray analyzer and UV-Vis a bsorption spectrum.