Preparation of TiO2 Nanoparticles Doped with Cs+ and Sr2+ and Their Photocatalytic Activity Under Solar Light
Using cesium nitrate and strontium nitrate as doping metal ions source,Cs-doped TiO2 and Sr-doped TiO2 photocatalysts were successfully synthesized through the hydrolysis of tetrabutyl titanate by an acid-catalyzed sol-gel method.The photocatalytic activities of these catalysts prepared at 600 ℃ for 2 h were evaluated by the degradation of methyl orange in aqueous solution under solar light irradiation,and the as-prepared samples with higher photocatalytic efficiency were characterized by means of X-ray diffraction (XRD) and UV-Vis absorption spectroscopy.The XRD patterns indicate that the crystal structure still remains as anatase phase for the doped samples,and the average crystal size of TiO2,0.1 at％ Cs-doped TiO2 and 0.3 at％ Sr-doped TiO2 is 21.3,13.1 and 10.8 nm,respectively.The band gap absorption shows red shift to the visible region for the doped samples from the UV-Vis spectrogram.The results show that the photocatalytic activity of TiO2 nanoparticles doped with Cs+ and Sr2+ exhibits a significant improvement and their degradation efficiencies are more than 30％ in comparison with those of TiO2 under the same condition,and the optimal doping concentration is determined to be 0.1 at％ and 0.3 at％ for Cs+and Sr2+,respectively.
Cs-doped TiO2 Sr-doped TiO2 photocatalytic activity solar light methyl orange
Luo Jie Yang Xinyuan Li Deliang
School of Material Science and Engineering,Central South University of Forestry and Technology,Changsha 410004,P.R.China
国际会议
哈尔滨
英文
1945-1950
2010-07-24（万方平台首次上网日期，不代表论文的发表时间）