【作者】 徐刘君； 燕宁宁； 朱忠其； 柳清菊；

【Author】 Liujun Xu~1,Ningning Yan~1,Zhongqi Zhu~1,Qingju Liu~1 (1 Yunnan Key laboratory of nanomaterials & technology,Yunnan University,Kunming 650091,China,

【机构】 云南省高校纳米材料与技术重点实验室云南大学；

【摘要】 本文采用溶胶-凝胶法制备了稀土Yb掺杂纳米TiO₂光催化剂（Yb-TiO₂）,采用XRD、UV-Vis、FT-IR等方法对其进行表征和分析,并以亚甲基蓝（MB）作为目标降解物,考察了不同掺杂离子浓度的Yb-TiO₂对MB的光催化降解效果,实验结果表明:掺杂后的样品均为金红石相和锐钛矿相的混晶相,Yb的掺入拓展了TiO₂对可见光的吸收范围,有效地抑制了光生电子-空穴对的复合,从而提高了光催化活性。在本实验范围内,当pH=2.5、Yb:Ti=0.005（摩尔比）、热处理温度为550℃条件下制备的样品其光催化活性明显优于Degussa P25。更多还原

【Abstract】 Yb-doping TiO₂ catalysts were synthesized by sol-gel method and characterized by XRD,UV-Vis, FT-IR et al.Meanwhile,the degradation of methyl blue（MB） was investigated under fluorescent lamp to test the photocatalytic activity of the samples with different Yb-doping concentration.The results show that all the prepared samples consist of anatase and rutile phases.Yb-doping can extend the absorption spectrum of TiO₂ to the visible light region and increase the separation of the photoelectron-hole pairs.Thus,the photocatalystic activity is improved.When pH value is 2.5,Yb:Ti= 0.005（molar ratio） and sintered temperature is 550℃,the photocatalytic activity is the best.更多还原