原位红外光谱法研究Gd^(3+)掺杂TiO_2光催化降解乙烯性能  

In Situ FTIR Study On Photocatalytic Degradation of Ethylene Over Gd^(3+)-Doped TiO_2

作　　者：黄雅丽[1] 李旦振[1] 付贤智[1] 王绪绪[1] 

机构地区：[1]福州大学光催化研究所,福州350002

出　　处：《无机化学学报》2004年第7期868-872,共5页Chinese Journal of Inorganic Chemistry

基　　金：国家自然科学基金重点项目(No.20133010);国家自然科学基金项目(No.20273014);教育部科技重点项目(No.03061;01059);福建省自然科学基金重大项目(No.2003F004;2002H008);福建省教育厅重点项目(No.JA02138;JA01002)资助。

摘　　要：The Gd3+-doped TiO2 photocatalyst was prepared by the sol-gel and impregnation method. The effect of Gd3+ doping on crystalline size, BET surface area and photocatalytic activity was studied by XRD, FTIR, BET, UV-Vis diffuse reflection spectroscopy, surface photovoltage spectroscopy (SPS). The activities of TiO2 and Gd3+-doped TiO2 catalysts for photocatalytic degradation of ethylene were studied by means of in situ FTIR. The photocatalytic reaction rate constant of ethylene becomes larger through Gd3+ doping. The rate constant of TiO2 was k1=8.51×10-4 min-1, while that of Gd/TiO2 was k2=1.85×10-3 min-1. At the same time, the yield of CO2 increased with Gd3+ doping. The enhancement in photocatalytic activity is probably due to the increase of light absorption, higher content of anatase, smaller crystal line size and higher specific surface area. In addition, the higher photocatalytic activity of Gd3+-doped TiO2 might be attributed to the effective separation of photo-generated electron-hole pairs.The Gd3+-doped TiO2 photocatalyst was prepared by the sol-gel and impregnation method. The effect of Gd3+ doping on crystalline size, BET surface area and photocatalytic activity was studied by XRD, FTIR, BET, UV-Vis diffuse reflection spectroscopy, surface photovoltage spectroscopy (SPS). The activities of TiO2 and Gd3+-doped TiO2 catalysts for photocatalytic degradation of ethylene were studied by means of in situ FTIR. The photocatalytic reaction rate constant of ethylene becomes larger through Gd3+ doping. The rate constant of TiO2 was k(1)=8.51 x 10(-4) min(-1), while that of Gd/TiO2 was k(2)=1.85x10(-3) min(-1). At the same time, the yield of CO2 increased with Gd3+ doping. The enhancement in photocatalytic activity is probably due to the increase of light absorption, higher content of anatase, smaller crystal line size and higher specific surface area. In addition, the higher photocatalytic activity of Gd3+-doped TiO2 might be attributed to the effective separation of photo-generated electron-hole pairs.

关 键 词：钆掺杂二氧化钛 光催化氧化降解 乙烯 原位红外光谱法 

分 类 号：O623.121[理学—有机化学] O643.36[理学—化学]