摘要
以钛酸四正丁酯为钛源,异丙醇铝为铝源,采用溶胶-凝胶法制备了TiO2-Al2O3复合光催化剂,考察其对甲基橙的吸附性能和在紫外光照射下的光催化活性。采用X射线衍射(XRD)、X射线光电子能谱(XPS)、傅里叶变换红外光谱(FT-IR)、N2吸附-脱附等对催化剂的晶相结构、化学组成及BET比表面积和孔径分布等进行了表征。结果表明TiO2-Al2O3复合光催化剂由TiO2和Al2O3组成,其中TiO2为单一的锐钛矿晶相,Al2O3为非晶态,Al2O3的存在可抑制TiO2晶粒的生长。在n(Ti)/n(Al)=12,500℃煅烧3h制得的TiO2-Al2O3复合光催化剂比表面积达99.21m2/g,平均孔径为22.39nm,累计孔容积为0.4493cm3/g。在500℃煅烧制得的复合光催化剂具有最佳的光催化活性和吸附性能。与纯TiO2相比,相同条件下TiO2-Al2O3复合光催化剂的光催化活性和吸附性能都有较大提高。
The TiO2-Al2O3 composite photocatalyst was prepared by a sol-gel method from a sol mixture derived from tetrabutyl titanate and aluminium isopropoxide.Methyl orange adsorption ability as well as photocatalytic oxidation of methyl orange on the composite photocatalyst under UV-light irradiation was investigated.The crystalline structure,surface morphology,composition,BET surface area and pore size distribution of the samples were characterized by X-ray diffraction（XRD）,X-ray photoelectron spectroscopy（XPS）,Fourier transform infrared spectroscopy（FI-IR）,and N2-adsoption and desorption.The results show that the TiO2-Al2O3 composite is composed of TiO2 and Al2O3,where TiO2 is in its anatase phase and Al2O3 is in its amorphous phase.The crystalline grain growth of TiO2 is retained by the existence of Al2O3.The TiO2-Al2O3 composite photocatalyst（n（Ti）/n（Al）=12） calcinated at 500℃ for 3 h has BET surface area of 99.21m2/g,average pore size of 22.39nm,and total pore volume of 0.4493cm3/g.The optimum calcination temperature for the composite is 500℃ so as to obtain the maximum photocatalytic activity and adsorption ability.As compared with pure TiO2,photocatalytic activity and adsorption ability of the TiO2-Al2O3 composite are enhanced obviously under the same conditions.
出处
《功能材料》
EI
CAS
CSCD
北大核心
2011年第B11期848-851,共4页
Journal of Functional Materials
基金
国家自然科学基金资助项目(50774074)
辽宁省科学技术计划资助项目(2010229002)
