Effect of transition metaldoping under reducing calcination atmosphere on photocatalytic property of TiO_2 immobilized on SiO_2 beads  

作　　者：Rumi Chand Eiko Obuchi Katsumi Katoh Hom Nath Luitel Katsuyuki Nakano 

机构地区：[1]Department of Chemical Engineering, Fukuoka University [2]Department of Applied Chemistry, Saga University

出　　处：《Journal of Environmental Sciences》2013年第7期1419-1423,共5页环境科学学报（英文版）

摘　　要：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 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.

关 键 词：heterogeneous photocatalysis TiO2 SiO2 beads metaldoping PHOTODECOMPOSITION 

分 类 号：O643.36[理学—物理化学]