Enhanced photocatalytic degradation of VOCs using Ln(3+)-TiO2 catalysts for indoor air purification
文献类型： 外文期刊
作者： Li, FB 1 ; Li, XZ 2 ; Ao, CH 2 ; Lee, SC 2 ; Hou, MF 2 ;
作者机构： 1.Hong Kong Polytech Univ, Dept Civil & Struct Engn, Kowloon, Hong Kong, Peoples R China
2.Hong Kong Polytech Univ, Dept Civil & Struct Engn, Kowloon, Hong Kong, Peoples R China; Guangdong Inst Ecoenvironm & Soil Sci, Guangdong Key Lab Agr Environm Pollut Integrated, Guangzhou 510650, Peoples R China
关键词： BTEX;indoor air purification;lanthanide ion;photocatalysis;TiO2
期刊名称：CHEMOSPHERE （ 影响因子：7.086； 五年影响因子：6.956 ）
ISSN： 0045-6535
年卷期： 2005 年 59 卷 6 期
页码：
收录情况： SCI
摘要： Two types of lanthanide ion-doped titanium dioxide (Ln(3+)-TiO2) catalysts including La3+-TiO2 and Nd3+-TiO2 were prepared by a sol-gel method. The effects of the lanthanide ion doping on the crystal structure, surface area, adsorption properties, pore size distribution, and surface chemical state of the catalysts were investigated by means of XRD, BET, and XPS. As results, the crystal size decreased significantly, while the specific surface area, t-plot total surface area, micropore volume, and the total pore volume increased owing to the lanthanide ion doping. The nitrogen adsorption-desorption isotherms of the catalysts showed that the N-2 adsorption ability of the Ln(3+)-TiO2 catalysts was better than the TiO2 catalyst. Among them, the 0.7% Ln(3+)-TiO2 catalysts demonstrated the highest adsorption ability. The photocatalytic activity of the catalysts was investigated in the experiments of the photocatalytic degradation of benzene, toluene, ethylbenzene and o-xylene (BTEX) in a gaseous phase. The photocatalytic efficiency of the TiO2 catalysts with the lanthanide ion doping was remarkably enhanced by BTEX removal. The 1.2% Ln(3+)-TiO2 catalysts achieved the highest photocatalytic activity. The enhanced photodegradation of BTEX is possibly due to the improved adsorption ability and the enhanced electron-hole pairs separation due to the presence of Ti3+ on the surface of Ln(3+)- TiO2 catalysts and the electron transfer between the conduction band/defect level and lanthanide crystal field state. © 2004 Elsevier Ltd. All rights reserved.
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