Preparation and Photocatalytic Behaviors of Nanoporous Polyoxotungstate-Anatase TiO_2 Composites  

作　　者：李莉 李英杰 马禹 郭伊荇 

机构地区：[1]Faculty of Chemistry, Northeast Normal University,Changchun 130024, China [2]Faculty of Chemistry and Chemical Engineering, Qiqihar University,Qiqihar 161006, China

出　　处：《Journal of Rare Earths》2007年第1期68-73,共6页稀土学报（英文版）

基　　金：Project supported by the Natural Science Fund Council of Heilongjiang Province (B200608)

摘　　要：Nanoporous anatase TiO2 crystalline particles coupled with Keggin or Wells-Dawson unit, H3PW12O40/TiO2 or H6P2W18O62/TiO2, were prepared at a low temperature （200℃ ） using sol-gel method combined with hydrothermal treatment at programmed temperature. The as-prepared composites have uniform anatase phase, and they exhibit both micrand mesoporosities with pore sizes of 0.6 and 4.0 nm, respectively, and their average size is lower than 10 nm. Photocatalytic tests show the composites exhibit relatively higher photocatalytic activities to decompose the organocholorine pesticide hexachlorobenzene（HCB） than anatase TiO2, the starting polyoxotungstates, and EuEOa/TiO2 prepared by using sol-gel method, and this was attributed to （ 1 ） the synergistic effect of photoactive anatase TiO2 with the polyoxotungstate, and （2） the fascinating physical and chemical properties of the porous materials.Nanoporous anatase TiO2 crystalline particles coupled with Keggin or Wells-Dawson unit, H3PW12O40/TiO2 or H6P2W18O62/TiO2, were prepared at a low temperature （200℃ ） using sol-gel method combined with hydrothermal treatment at programmed temperature. The as-prepared composites have uniform anatase phase, and they exhibit both micrand mesoporosities with pore sizes of 0.6 and 4.0 nm, respectively, and their average size is lower than 10 nm. Photocatalytic tests show the composites exhibit relatively higher photocatalytic activities to decompose the organocholorine pesticide hexachlorobenzene（HCB） than anatase TiO2, the starting polyoxotungstates, and EuEOa/TiO2 prepared by using sol-gel method, and this was attributed to （ 1 ） the synergistic effect of photoactive anatase TiO2 with the polyoxotungstate, and （2） the fascinating physical and chemical properties of the porous materials.

关 键 词：POLYOXOTUNGSTATE anatase TiO2 PHOTOCATALYSIS SOL-GEL hydrothermal treatment 

分 类 号：O643.32[理学—物理化学]