【作者】 吕晓萌； 谢吉民； 尹常庆； 舒和庆； 孙波；

【Author】 Lü Xiaomeng~(1,2) XIE Jimin~(1,2) YIN Changqing~2 SHU Heqing~1 SUN Bo~1 (1.School of Chemistry & Chemical Engineering,Jiangsu University,Zhenjiang,212013,Jiangsu; 2.Jiangsu Environmental Materials and Environmental Engineering Key Laboratory,Yangzhou University,Yangzhou,225009,Jiangsu; 3.Zhenjiang Environmental Monitoring Center,Zhenjiang,212001,Jiangsu,China)

【机构】 江苏大学化学化工学院； 镇江市环境监测中心站；

【摘要】 为了研究不同掺杂对二氧化钛光化学活性的影响,采用溶胶-凝胶,水热法,由 TiOCl₂成功制备了掺杂氮原子的二氧化钛样品,并制备了掺杂0．5%（摩尔分数）Fe³⁺,Cu²⁺,V⁵⁺,pd²⁺等金属离子的可见光响应型介孔材料。样品经由 X 射线衍射,透射电镜,Brunauer-Emmett-Teller（BET）比表面积,Barrett-Joyner-Halenda 孔径分布,紫外可见光谱,光电子能谱和荧光光谱等表征：以荧光灯为光源（入射光波长λ≥410 nm）,光催化降解甲醛为模式,评价了样品的催化活性。结果表明：掺杂 Fe³⁺,Cu²⁺,V⁵⁺,Pd²⁺的二氧化钛和单一掺氮的二氧化钛样品的粒径均为10nm 左右,BET 比表面积为130 m²/g 左右,均为锐钛矿相二氧化钛；Fe/TiO₂,Cu/TiO₂,V/TiO₂,Pd/TiO₂和 TiO₂/N 样品的带隙能依次为：2．99,2．93,2．36,2．92 eV 和 2．87 eV,其在可见光下的光催化降解速率常数分别为：0．0063,0．0086,0．0049,0．0031/min 和0．0033/min。Cu/TiO₂较高的荧光强度和较大的比表面积,导致了其较高的可见光光解活性。更多还原

【Abstract】 Titania particles doped with nitrogen were sol-gel and hydrothermally synthesized in an autoclave from TiOCl₂.Mesopo- rous titania with 0.5% （in mole） Fe³⁺,Cu²⁺,V⁵⁺ and Pd²⁺ as dopants were also prepared based on the above synthesis method.The structure of the samples was characterized by X-ray diffraction,transmission electron microscopy,the Brunauer-Emmett-Teller （BET）specific surface area,the Barrett-Joyner-Halenda pore size distribution,ultraviolet-visible spectroscopy measurements and photoluminescence.The photocatalytic activity was investigated under visible light irradiation（λ≥410 nm）,and formaldehyde was taken as the test gas.It is found that the prepared samples are anatase titania with average grain sizes of about 10 nm and BET specific surface areas of about 130 m²/g.The band gap of the titania samples doped with Fe³⁺,Cu²⁺,V⁵⁺,Pd²⁺ and TiO₂/N is 2.99,2.93,2.36, 2.92 eV and 2.87 eV,respectively.The photo-degradation rate constant of titania samples with 0.5% （in mole）Fe³⁺,Cu²⁺,V⁵⁺ and Pd²⁺ doping and TiO₂/N is 0.0063,0.0086,0.0049,0.0031/min and 0.0033/min,respectively.Good dispersion of Cu²⁺ dopant onto the surface of titania,adequate surface area and decrease of recombination center on the surface of Cu/TiO₂ photocatalyst may contribute to its comparatively higher photocatalytic activity.更多还原