Heterostructured TiO2/WO3 porous microspheres: Preparation, characterization and photocatalytic properties
Heterostructured TiO2/WO3 porous microspheres: Preparation, characterization and photocatalytic properties
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DOI：
10.1016/j.cattod.2012.03.008
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发表时间：
2013-03
期刊：
影响因子：
5.3
通讯作者：
Jikai Yang;Xintong Zhang;Hong Liu;Changhua Wang;Shuping Liu;Panpan Sun;Lingling Wang;Yichun Liu-Yichu
中科院分区：
文献类型：
--
作者：
Jikai Yang;Xintong Zhang;Hong Liu;Changhua Wang;Shuping Liu;Panpan Sun;Lingling Wang;Yichun Liu-Yichu
Heterostructured TiO2/WO3porous microspheres with W/Ti molar ratio of 2, 4, and 10% (TW-2, TW-4, TW-10, respectively) were prepared by ultrasonic spray pyrolysis of aqueous suspension of Degussa P25 particles containing ammonium tungstate. Crystal phase evolution of WO3from amorphous to orthorhombic was observed with the increase of its content. TiO2/WO3heterostructured microspheres displayed higher photocatalytic activity towards acetaldehyde degradation than pure TiO2due to the enhanced charge separation by TiO2/WO3heterojunction, but only the TW-2 microspheres with amorphous WO3phase displayed faster generation of CO2and free hydroxyl radicals than TiO2(TW-0) micropheres. Photochromism was observed on the TW-4 and TW-10 microspheres due to electron accumulation in orthorhombic WO3, but not observed on the TW-2 with amorphous WO3. These observations suggest that the influence of WO3on the photocatalytic activity of TiO2is complicated, and should be related to the crystal phase and electron accumulation ability of WO3, as well as the degradation mechanism of pollutants.
