B掺杂量对TiO_2纳米粉体的结构与光催化性能影响研究  

Effect of B Doping on the Structure and Photocatalytic Properties of TiO_2 Nano Powders

作　　者：王竹梅[1] 刘波[1] 谢志翔[1] 李月明[1] 沈宗洋[1] 左建林[1] 

机构地区：[1]景德镇陶瓷学院材料科学与工程学院江西省先进陶瓷材料重点实验室,景德镇333403

出　　处：《人工晶体学报》2016年第1期229-235,共7页Journal of Synthetic Crystals

基　　金：国家自然科学基金(51462010);江西省科技支撑计划项目(20132BBE50014)

摘　　要：采用溶胶凝胶法制备了不同量B掺杂TiO_2纳米粉体,采用X射线衍射(XRD)、透射电子显微镜(TEM)、X射线光电子能谱(XPS)、傅里叶变换红外吸收光谱(FT-IR)及紫外-可见漫反射光谱(UV-Vis)等技术对催化剂进行了表征。结果表明:B部分掺入到TiO_2晶格间隙中形成B-O-Ti键,部分以B_2O_3的形式存在,随着B掺杂量的增加,进入晶格的B比例减少;B掺杂有效抑制了TiO_2由锐钛矿相向金红石相的转变,掺杂样品经650℃煅烧后仍为锐钛矿结构,随B掺杂量的增加,其晶粒变小;B掺杂使得TiO_2表面羟基量显著增加,且掺杂量越大表面羟基量越多;各掺杂样品的吸收边带没有明显红移,光吸收强度较未掺杂TiO_2稍弱,且随着B掺杂量的增加,光吸收能力呈递减趋势。可见光催化降解亚甲基蓝结果表明,B掺杂大大提高了TiO_2的光催化活性,这与掺B后晶粒变小,表面羟基量显著增加有关;当B掺杂质量百分数为1.0%时,B/TiO_2可见光催化活性最高,达93.40%。B-doped TiO_2 nano-powders were prepared by sol-gel method.The powders were characterized by X-ray diffraction(XRD),transmission electron microscopy(TEM),X-ray photoelectron spectroscopy(XPS),fourier transform infrared spectroscopy(FT-IR) techniques and UV-Vis spectrophotometer and so on.The results indicate that parts of B occupied the TiO_2 lattice gap to form B-O-Ti bonds,parts of them loaded on the surface of TiO_2 grain to form B_2O_3.With the increase of B doping amount,the entering amount of B into lattice decrease.B doping effectively inhibit the phase transformation from anatase to rutile.All B-doped samples remained rutile structure after a heat treatment under 650℃,and the grain size decrease with the increase of B doping amount.B doping could introduce more hydroxyl groups on the surface of TiO_2,and the hydroxyl content increase with the increase of B doping amount.All the samples show no obvious red shift of absorption edge.The optical absorption intensity of B-doped TiO_2 is weaker than undoped TiO_2,and decrease with the increase of B doping amount.B doping could greatly improve the photocatalytic activity of TiO_2 under the visible light,which may be related to the decrease of crystal particles,and increase of hydroxyl groups on the surface of TiO_2.When the B doping amount is 1.0wt%,the B/TiO_2 nano-powders possess highest visible light catalytic activity of 93.40%.

关 键 词：TI O2 硼掺杂 可见光 光催化降解 

分 类 号：O643.36[理学—物理化学]