过氧改性纳米TiO_2溶胶的制备及其光催化性能  

Preparation and Photocatalytic Properties of Peroxo-modified Nano-TiO_2 Sol

作　　者：许第发[1] 张世英[1] 游洋[1] 张向超[1] 罗寄希[1] 

机构地区：[1]长沙学院生物工程与环境科学系,长沙410022

出　　处：《硅酸盐通报》2012年第4期1006-1011,1017,共7页Bulletin of the Chinese Ceramic Society

基　　金：国家自然科学基金(No.51102026);湖南省高校科技创新团队支持计划资助;湖南省大学生研究性学习和创新性实验计划项目

摘　　要：以硫酸氧钛为钛源,过氧化氢为络合剂,采用低温水热法制备了过氧改性纳米TiO2溶胶,并对制备过程中的影响因素进行了研究,同时,通过甲醛废水模型体系考察了溶胶的光催化活性。采用X射线衍射、透射电镜、紫外-可见漫反射光谱等测试手段对TiO2进行了表征。结果表明,当水解反应pH值为8.0,硫酸氧钛浓度为0.10 mol/L,陈化时间为24 h,Ti4+/H2O2物质的量比为1∶4,水热反应温度和时间分别为100℃和6～8 h时,可制得直径20nm、长30 nm,结晶良好的锐钛矿过氧改性纳米TiO2和分散均匀的溶胶。经紫外光和太阳光光照180 min后,过氧改性纳米TiO2溶胶对甲醛的降解率分别为95.3%和31.8%,优于相同条件下P25的光催化性能(69.7%和21.1%)。Peroxo-modified nano-TiO2 sol was synthesized using titanyl sulfate （TiOSO4） as precursor, peroxide（H202） as complex agent by hydrothermal method at low temperature. Photocatalytic activity of the sol was analyzed by a model of formaldehyde waste solution. The materials were characterized by the X-ray diffraction patterns （ XRD）, transmission electron microscope （ TEM ）, UV-vis spectrophotometer （ DRS）, and the effects of the preparation parameters on the properties of the sol were also investigated. The results showed that the sol was excellent in dispersibility and was stable in neutral without causing agglomeration. The TiO2 particle size was 20 nm in diameter and 30 nm in length and showed anatase structure. The best reaction condition on the preparation of the sol was ： the pH value of hydrolysis was 8. 0, the concetration of TiOSO4 was O. 10 mol/L, the aging time of the peroxotitanium acid sol was 24 h, the mole rate of Ti4~ and H202 was l：4,the heating temperature was 100 ~C and the time was 6-8 h. The experiment of photocatalytic degradation formaldehyde solution indicated that photocatalytic activity of the sol was higher than that of P25, the degradation rate of the formaldehyde solution reached to 95.3 % and 31.8% at ultraviolet light and sunlight respectively.

关 键 词：水热法 TIO2溶胶 过氧钛酸溶胶 光催化活性 

分 类 号：O643[理学—物理化学]