A visible light-responsive iodine-doped titanium dioxide nanosphere  

作　　者：Zhiqiao He Liyong Zhan Fangyue Hong Shuang Song Zhengying Lin Jianmeng Chen Mantong Jin 

机构地区：[1]College of Biological and Environmental Engineering, Zhejiang University of Technology, Hangzhou 310032, China [2]Department of Chemical Engineering, Hangzhou Vocational & Technical College, Hangzhou 310018, China

出　　处：《Journal of Environmental Sciences》2011年第1期166-170,共5页环境科学学报（英文版）

基　　金：supported by the National Natural Science Foundation of China (No.21076196,20977086);the National Basic Research Program (973) of China(No.2009CB421603);the Zhejiang Provincial Natural Science Foundation of China (No.Z5080207)

摘　　要：I-doped titanium dioxide nanospheres （I-TNSs） were synthesized via a two-step hydrothermal synthesis route, their potential for the efficient utilization of visible light was evaluated. The prepared anatase-phase I-TNSs had a bimodal porous size distribution with a Brunauer-Emmett-Teller surface area of 76 m2/g, a crystallite size of approximately 14 nm calculated from X-ray diffraction data, and a remarkable absorption in the visible light region at wavelengths 〉 400 nm. The photocatalytic activity of the samples was evaluated by decoloration of Methyl Orange in aqueous solution under visible light irradiation in comparison to the iodine-doped TiO2 （I-TiO2）. The I-TNSs showed higher photocatalytic efficiency compared with I-TiO2 after irradiation for 180 rain even though the latter had a much greater surface area （115 m2/g）. It was concluded that the surface area was not the predominant factor determining photocatalytic activity, and that the good crystallization and bimodal porous nanosphere structure were favourable for photocatalysis.I-doped titanium dioxide nanospheres （I-TNSs） were synthesized via a two-step hydrothermal synthesis route, their potential for the efficient utilization of visible light was evaluated. The prepared anatase-phase I-TNSs had a bimodal porous size distribution with a Brunauer-Emmett-Teller surface area of 76 m2/g, a crystallite size of approximately 14 nm calculated from X-ray diffraction data, and a remarkable absorption in the visible light region at wavelengths 〉 400 nm. The photocatalytic activity of the samples was evaluated by decoloration of Methyl Orange in aqueous solution under visible light irradiation in comparison to the iodine-doped TiO2 （I-TiO2）. The I-TNSs showed higher photocatalytic efficiency compared with I-TiO2 after irradiation for 180 rain even though the latter had a much greater surface area （115 m2/g）. It was concluded that the surface area was not the predominant factor determining photocatalytic activity, and that the good crystallization and bimodal porous nanosphere structure were favourable for photocatalysis.

关 键 词：I-doped titanium dioxide NANOSPHERES Methyl Orange visible light 

分 类 号：TQ134.11[化学工程—无机化工] O614.411[理学—无机化学]