介孔TiO_2-SO_4^(2-)的合成及表征  

Synthesis and Characterization of Mesoporous TiO_2-SO_4^(2-)

作　　者：沈俊[1] 罗妮[1] 张明俊[1] 田从学[1] 张昭[1] 

机构地区：[1]四川大学化工学院,四川成都610065

出　　处：《催化学报》2007年第3期264-268,共5页

基　　金：国家自然科学基金(50474071).

摘　　要：在不使用有机模板剂的条件下,以工业硫酸钛溶液为原料合成了高热稳定的锐钛矿型介孔TiO_2-SO_4^(2-).用X射线衍射、N2吸附、扫描电镜、X射线能谱、傅里叶变换红外光谱和紫外-可见光谱对样品进行了表征,并考察了其光催化性能.结果表明,硫酸根在焙烧过程中与前驱体介孔偏钛酸孔壁上自由羟基的键合起到了孔结构导向及支撑作用,500℃焙烧后样品仍具有202.2m2/g的比表面积及2.8nm的平均孔径.焙烧产物TiO_2-SO_4^(2-)中S=O的强电子诱导效应不仅使邻近的Ti成为超强酸中心,还使二氧化钛的吸收光谱产生30nm的红移,光催化活性显著提高.Mesoporous anatase TiO2-SO^2-4 with high thermal stability was synthesized without organic templates. The sample was characterized using X-ray diffraction, N2 adsorption, scanning electron microscopy, energy dispersive X-ray spectroscopy, Fourier transform infrared spectroscopy, and ultraviolet-visible spectroscopy, and its photocatalytic activity was tested. TiO2-SO^2-4 that is bonded to free -OH on pore wails of metatitanic acid during the calcination acts as the pore structure-directing agent and pore structure support. After calcination at 500℃, the mesoporous TiO2-SO^2-4 has a surface area of 202.2 m^2/g and an average pore diameter of 2.8 nm. The electron inductive effect of S=O in TiO2-SO^2-4 not only makes adjacent Ti a superacidic center but also causes a red shift of the adsorption spectrum of the sample by 30 nm. Its photocatalytic activity is also enhanced obviously.

关 键 词：介孔二氧化钛 偏钛酸 光催化 硫酸根 超强酸 

分 类 号：O614.411[理学—无机化学]