采用溶胶-凝胶-溶剂热路径合成H_3PW_(12)O_(40)/TiO_2和H_4SiW_(12)O_(40)/TiO_2及其光催化降解二硝基甲苯(英文)  

Photocatalysis of dinitrotoluene decomposition by H_3PW_(12)O_(40)/TiO_2 and H_4SiW_(12)O_(40)/TiO_2 prepared by a modified sol-gel synthesis and solvothermal treatment method

作　　者：冯长根[1] 尚海茹[1] 刘霞[2] 

机构地区：[1]北京理工大学爆炸科学与技术国家重点实验室,北京100081 [2]中国农业大学理学院,北京100193

出　　处：《催化学报》2014年第2期168-174,共7页

基　　金：supported by the Institution of Chemical Materials,China Academy of Engineering Physics~~

摘　　要：以非离子表面活性剂P123为结构导向剂,采用溶胶-凝胶与溶解热相结合方法,制备了两类介孔材料H3PW12O40/TiO2和H4SiW12O40/TiO2,并对其进行了表征.X射线粉末衍射和拉曼光谱分析表明,所制催化剂为锐钛矿晶型,体系中H3PW12O40和H4SiW12O40的Keggin结构经400°C焙烧后仍保持完整.H3PW12O40/TiO2和H4SiW12O40/TiO2的平均粒径分别为15.49和7.75 nm.N2吸附-脱附和扫描电镜结果表明,P123的加入使催化剂的粒径减小,比表面积和孔体积明显增大,其中H3PW12O40/TiO2和H4SiW12O40/TiO2的比表面积分别高达252.2和250.0 m2/g.紫外漫反射吸收光谱表明,与纯TiO2相比,复合催化剂的吸收光谱发生了明显的红移,且吸收强度明显增大.催化剂对DNT降解实验表明,在最佳操作条件下降解率可高达95%.Mesoporous H3PW12040/TiO2 and 1-145iW12040/TiO2 were synthesized by combining sol-gel technology using a nonionic surfactant P123 as a structure directing agent with solvothermal treatment. X-ray diffraction and Raman spectroscopy results indicated that the TiO2 particles had the anatase phase, and the primary Keggin structures of H3PW12040 and H4SiWl2040 remained intact after calcination at 400 ℃. N2 adsorption-desorption analysis and scanning electron microscopy showed that the specific surface area and pore volume were increased by the addition of P123. The specific surface area of H3PW12040/Ti02 and H4SiWl2040/Ti02 increased to 252.2 and 250.0 m2/g, respectively. Ultraviolet-visible absorption spectroscopy showed that compared with pure TiO2, an obvious red shift occurred and the absorption intensity was increased for the composite catalysts. The catalysts were tested and the degradation rate of dinitrotoluene was as high as 95% under the optimum conditions.

关 键 词：介孔材料 多金属氧酸盐 二氧化钛 结构导向剂 二硝基甲苯 光催化降解 

分 类 号：O643.36[理学—物理化学]