高分散TiO2/SBA-15的制备及光催化性能  

Synthesis and Photocatalytic Activity of Highly Dispersed TiO_2/SBA-15

作　　者：张书翠[1,2] 姜东[1] 唐涛[1,2] 李君华[1,2] 徐耀[1] 

机构地区：[1]中国科学院山西煤炭化学研究所,煤转化国家重点实验室,太原030001 [2]中国科学院研究生院,北京100049

出　　处：《物理化学学报》2010年第5期1330-1336,共7页Acta Physico-Chimica Sinica

基　　金：煤转化国家重点实验室自主研究项目(2008BWZ011)资助~~

摘　　要：提出了一种制备高分散TiO2/SBA-15光催化剂的新方法.以钛酸四正丁酯(TB)和羧基改性的SBA-15(COOH/SBA-15)为原料,利用COOH/SBA-15表面上高分散的羧基与TB的配合作用将TB锚定,经过溶剂热及焙烧处理制得TiO2/SBA-15光催化剂.采用粉末X射线衍射(XRD),N2吸脱附,傅里叶变换红外光谱(FT-IR),透射电镜(TEM)等对所得催化剂进行了表征.结果表明:所得TiO2/SBA-15光催化剂为高结晶度的锐钛矿晶型,TiO2均匀地分散在SBA-15表面,TiO2/SBA-15光催化剂保持较好的介孔特征结构,具有较大比表面积.以降解罗丹明B(RhB)为探针反应,考察了所得TiO2/SBA-15光催化剂的光催化性能.与后处理浸渍法制备的光催化剂相比,本文制备的TiO2/SBA-15光催化剂表现出了更加优越的光催化性能.Highly dispersed TiO2/SBA-15 photocatalysts were successfully synthesized by solvothermal treatment using titanium n-butoxide（TB） and carboxylate-modified SBA-15（COOH/SBA-15） as raw materials.The good dispersive carboxyl groups of COOH/SBA-15 coordinated with TB molecules to anchor them.After solvothermal treatment,the TB molecules were transformed into TiO2 nanoparticles and finally formed the TiO2/SBA-15 products.The products were calcined to improve the crystallization of TiO2 and to remove the organic compounds.As-obtained TiO2/SBA-15 photocatalysts were characterized by X-ray diffraction（XRD）,nitrogen adsorption,Fourier transform infrared（FI-IR） spectroscopy,and transmission electron microscopy（TEM）.Analytical results showed that the as-obtained TiO2/SBA-15 photocatalysts possessed a better mesoporous structure and a larger specific surface area.The highly crystalline anatase TiO2 nanocrystals dispersed well on the surface of SBA-15.Rhodamine B（RhB）,as a photodegradation target,was used to evaluate photocatalytic performance under UV light irradiation.The as-obtained TiO2/SBA-15 photocatalysts exhibited much better photocatalytic activity compared with the photocatalysts prepared by a post-synthesis impregnation method.

关 键 词：光催化 羧基改性 TIO2 SBA-15 溶剂热 

分 类 号：O643.36[理学—物理化学]