【摘要】 采用溶胶凝胶法制备了不同量B掺杂TiO₂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TiO₂晶格间隙中形成B-O-Ti键,部分以B₂O₃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TiO₂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TiO₂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TiO₂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TiO₂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/TiO₂可见光催化活性最高,达93.40%。更多还原

【Abstract】 B-doped TiO₂ 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 TiO₂ lattice gap to form B-O-Ti bonds,parts of them loaded on the surface of TiO₂ grain to form B₂O₃.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 TiO₂,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 TiO₂ is weaker than undoped TiO₂,and decrease with the increase of B doping amount.B doping could greatly improve the photocatalytic activity of TiO₂ under the visible light,which may be related to the decrease of crystal particles,and increase of hydroxyl groups on the surface of TiO₂.When the B doping amount is 1.0wt%,the B/TiO₂ nano-powders possess highest visible light catalytic activity of 93.40%.更多还原