介孔Co-TiO_2的制备及其光催化性能研究

Preparation and photocatalystic activity of the mesoporous Co-doping nanometer TiO_2

以钛酸四丁酯为原料,硝酸钴为掺杂剂,在室温下采用水解沉淀法制备出掺杂金属Co的纳米介孔TiO2光催化剂。采用X射线衍射（XRD）,透射电子显微镜（TEM）,N2吸附/脱附等技术对其组织结构进行表征并研究了不同热处理温度、不同掺杂量对TiO2相变和光催化性能的影响。确定了最佳的Co掺杂量和热处理温度。结果表明：通过改性的纳米介孔TiO2晶粒尺寸在20-30nm之间,比表面积达到98.231m^2/g,孔容0.285cm^3/g,孔径约18.5nm。Co掺杂的最佳值为x（Co）∶x（Ti）=0.1%,Co-TiO2光催化剂的最佳热处理温度是500℃,光催化剂最佳投放量为1.0g/L。以甲基橙为降解目标物,在紫外光下的降解率最高可达95%。

Cobah doped mesoporous TiO2 photocatalyst was prepared by hydrolysis precipitation method with Ti （OBu）4 as raw material, HAC as doping agent at room temperature. The morphology and microstructure of the prepared mesoporous Co-TiO2 were characterized by X-ray diffraction（XRD）, transmission electronmicroscopy （TEM） and N2 adsorption/desorption isotherm. The structure of the nanocomposites and the relationship between the concentrations of Co and their photocatalystic activity, between heat treatment temperatures and their photocatalystic activity were also studied. The best doping rate and heat treatment temperature were obtained. The results showed that mesoporous titania grain size were in the range of 20-30nm. The mesoporous titania with Co/TiO2 molar ratio of 1.0 shows a narrow distributing pore diameter of 18. 5nm, large special surface area of 98. 231m^2/g and pore volume of 0. 285cm^3/g. The best heat treatment temperature of the mesoporous Co-TiO2 was 500℃. The optimal concentration of the mesoporous Co-TiO2 was 1.0g/L. Degradation rate of methyl orange was maximal, up to 950/6.