浸渍法制备SO_4^(2-)/TiO_2-La_2O_3及其光催化氧化性能  

Preparation of SO_4^(2-) /TiO_2-La_2O_3 by impregnation method and its photocatalytic oxidation performance

作　　者：张继昌[1] 贾太轩[1,2] 石蔚云[1] 宋海香[1] 刘自力[2] 

机构地区：[1]安阳工学院化学与环境工程学院,河南安阳455000 [2]广州大学化学化工学院,广东广州510006

出　　处：《工业催化》2011年第6期22-26,共5页Industrial Catalysis

基　　金：国家自然科学基金(21076047)

摘　　要：不同硫酸浓度条件下,利用浸渍法处理TiO_2-La_2O_3,制得系列固体超强酸SO_4^(2-)/TiO_2-La_2O_3。通过XRD、FT-IR、TG-DTA和UV-Vis表征,揭示SO_4^(2-)/TiO_2-La_2O_3的微观结构和内在规律性。以邻硝基苯酚为探针反应,考察SO_4^(2-)/TiO_2-La_2O_3光催化性能。结果表明,SO_4^(2-)/TiO_2-La_2O_3的光催化活性明显高于TiO_2-La_2O_3,SO_4^(2-)/TiO_2-La_2O_3的催化活性取决于H_2SO_4浓度,浸渍液中H_2SO_4的合适浓度为0.5 mol·L^(-1),掺杂La_2O_3适宜的物质的量分数为0.5%,最佳焙烧温度为500℃。The photocatalysts SO42-/TiO2-La2O3 loaded with SO42- anion in H2SO4 solution of different concentration were prepared by impregnation method and characterized by XRD,FT-IR,TG-DTA and UV-Vis in order to reveal the microstructure and inherent regularity of SO42-/TiO2-La2O3. The photocatalytie properties of the catalysts was investigated using o-nitrophenol degradation as the probe reaction. The results showed that the photoeatalytic activity of SO42-/TiO2-La2O3 was higher than that of TiO2-La2O3 and depended on the sulfuric acid concentration. The optimum preparation condition of the catalyst was as follows ： sulfuric acid concentration 0.5 mol · L^-1 ,La2O3 doping amount 0.5% （molar ratio） and calcination temperature 500 ℃.

关 键 词：催化化学 SO_4~2-/TiO_2-La_2O_3 固体超强酸 光催化氧化 邻硝基苯酚 

分 类 号：O643.36[理学—物理化学] TQ426.94[理学—化学]