固体超强酸SO_4^(2-)/TiO_2制备及其光催化氧化性能  

Preparation of Solid Superacid SO_4^(2-)/TiO_2 and Evaluation of Their Photocatalytic Oxidation Activity

作　　者：杜金菊[1] 徐安武[2] 祝静艳[2] 

机构地区：[1]中山大学测试中心,广东广州510275 [2]中山大学化学与化学工程学院,广东广州510275

出　　处：《中山大学学报（自然科学版）》2001年第3期48-51,共4页Acta Scientiarum Naturalium Universitatis Sunyatseni

基　　金：国家自然科学基金!资助项目 (2 99730 5 9)

摘　　要：采用沉淀 -浸渍法制备固体超强酸催化剂SO2 -4 /TiO2 纳米粒子 ,并用XRD、BET、XPS、UV -Vis漫反射光谱等对其特性进行表征 .以NO-2 为降解目标物 ,考察了SO2 -4 /TiO2 光催化氧化性能 .结果表明 ,SO2 -4 /TiO2 在高温下相结构稳定 ,TiO2 的超强酸化可增大比表面积 ,有利于反应物吸附 ,同时产生吸收带边蓝移及禁带宽度增加 ,从而 ,产生较大的氧化还原势 ,与TiO2 相比 ,光催化氧化活性显著提高 .焙烧温度6 0 0℃时催化剂活性最好 .Solid superacid SO\+\{2-\}\-4/TiO\-2 catalysts were prepared by the precipitation and wet impregnation, and characterized by XRD, BET, XPS, and UV_Vis diffuse reflection spectra. Their photocatalytic activities were evaluated by the degradation of nitrite. The results indicated that the photocatalytic activity and structural properties of TiO\-2 were greatly improved by sulfation. The sulfated TiO\-2 (SO\+\{2-\}\-4/TiO\-2) possessed higher specific surface area, and the band gap of them increased and the band edge blue_shifted,thus yielding a larger redox potential and leading to the enhanced photocatalytic oxidation activity. The sample calcined at 600 ℃ showed the most effective for the photocatalytic oxidation of nitrite.

关 键 词：固体超强酸 SO2-4/TiO2 光催化氧化 NO-2 污染治理 制备 

分 类 号：X5[环境科学与工程—环境工程] O643.3[理学—物理化学]