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纳米复合Sb_2O_3/TiO_2的光催化性能研究
引用本文:李芳柏,古国榜,李新军,万洪富.纳米复合Sb_2O_3/TiO_2的光催化性能研究[J].无机化学学报,2001,17(1).
作者姓名:李芳柏  古国榜  李新军  万洪富
作者单位:1. 广东省生态环境与土壤研究所,
2. 华南理工大学化工学院,
基金项目:广东省自然科学基金资助项目!( No.980012)。
摘    要:采用溶胶-凝胶法制备复合纳米 Sb2O3/TiO2。 Sb2O3掺入浓度越大,催化剂中锐钛矿相含量越高,晶粒直径与颗粒直径越小,比表面积越大。在 380~ 460nm范围内, Sb2O3/TiO2的反射率则减弱,表明光吸收增强。 XPS分析表明:掺入 2% Sb2O3,出现新的 Ti2p3/2峰,对应于 Ti3+,占 9.13%;锑以 Sb3+、 Sb5+两种形式存在, Sb5+占 84.42%、 Sb3+占 17.58%。以亚甲基蓝溶液光催化降解为模型反应,掺入 2%、 5% Sb2O3,亚甲基蓝溶液的光催化脱色降解一级动力学常数与总有机炭( TOC)去除率增大。发射光谱证明: Sb2O3的最佳比例为 2%,当其比例大于 2%时,其电子空穴对的复合率升高,光催化活性下降。

关 键 词:光催化  二氧化钛  锑氧化物  复合半导体  亚甲基兰

The Enhanced Photo-Catalytic Behavior of Sb2O3/TiO2 Semiconductor Nanopowder
LI Fang-Bai GU Guo-Bang LI Xin-Jun WAN Hong-Fu.The Enhanced Photo-Catalytic Behavior of Sb2O3/TiO2 Semiconductor Nanopowder[J].Chinese Journal of Inorganic Chemistry,2001,17(1).
Authors:LI Fang-Bai GU Guo-Bang LI Xin-Jun WAN Hong-Fu
Institution:LI Fang-Bai1 GU Guo-Bang2 LI Xin-Jun2 WAN Hong-Fu1
Abstract:Sb2O3/TiO2 samples were prepared by sol-gel process and characterized by means of XRD, TEM, DRS, BET, XPS, photoluminescence (PL) spectra. It had been showed that the mean crystal diameter and mean particle diameter of Sb2O3/TiO2 samples decreased while specific surface area and the percent of anatase increased owing to doping Sb2O3. The reflectance percent of Sb2O3/TiO2 samples was less than that of pure TiO2 in the range of 380 ~460nm. Being a model reaction, the photo-catalytic degradation of methylene blue was investigated in TiO2, and Sb2O3/TiO2 nanopowder suspension irradiated by high-pressure mercury lamp. As a result, the first-order kinetic constant and TOC removal all increased owing to addition of 2% or 5% Sb2O3 to TiO2. XPS analyses showed that a new Ti2p3/2 peak presented at 457.94eV, corresponding to Ti3+, and the valence state of antimony is Sb3+ (17.58%) and Sb5+ (82.42%). The optimum dosage of Sb2O3 was 2%. The PL results showed that the increase of the recombination rate of electron/hole pairs lead to the decrease of photo-activity of samples when the dosage of Sb2O3 was more than 2%.
Keywords:photo-catalysis  titanium dioxide  antimony oxide  composite semiconductor  methylene blue  
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