掺硼纳米TiO_2的制备及光催化性能研究  

Preparation of B-Doped TiO_2 Nanoparticles and Their Photocatalytic Activities

作　　者：汪应灵[1] 谢友海[2] 袁建梅[1] 周庆祥[2] 刘国光[2,3] 

机构地区：[1]新乡医学院基础医学院,河南新乡453003 [2]河南师范大学化学与环境科学学院黄淮水环境与污染防治省部共建教育部重点实验室,河南新乡453007 [3]广东工业大学环境科学与工程学院,广东广州510006

出　　处：《影像科学与光化学》2010年第4期287-295,共9页Imaging Science and Photochemistry

基　　金：国家自然科学基金项目(20877022);河南省基础与前沿技术研究计划项目(092300410105;102300410101);河南省教育厅自然科学研究计划项目(2008A610007;2009A610008)

摘　　要：采用改进的Sol-gel方法,制备了单分散椭球形微孔结构的掺B纳米Ti O2光催化剂,并用TG-DTA、XRD、XPS、UV-Vis、TEM、BET等手段进行表征.以难生化降解的染料罗丹明B为目标降解物,采用HPLC检测,通过不同光照时间下染料降解率考察了产物的光催化活性.结果表明,改进的Sol-gel法制得的光催化剂具有明显的孔结构,而且比表面积大、孔径分布窄、粒径小、分散性好;适量B的掺杂能够有效促进Ti O2纳米粒子的光催化活性.最佳催化剂制备条件:B掺杂的摩尔分数为20%、450℃煅烧2 h,此时所制得的B-Ti O2光催化剂活性比纯Ti O2有显著提高.Using acetic acid as catalyzer and chelate,a sort of monodispersed,ellipsoidal and hollow B doped TiO2 nanoparticles is successfully prepared by Sol-gel method,which is based on an improved Sol-gel technique using boric acid triethylester,by controlling the hydrolysis of these precursors with an acetic acid.The TiO2 nanoparticles prepared were characterized by means of TG-DTA、XRD、XPS、UV-Vis、TEM and BET.The photocatalytic activity of the elaborated powders was studied following the degradation of Rhodamine B.The results showed that the photocatalytic activity of B doped TiO2 prepared by Sol-gel method is much higher than that of pure TiO2 particles.The most efficient degradation of Rhodamine B was found with TiO2 particles doped with 20% B in mole fraction and calcined at 450 ℃.Also the reason for the enhancement of the photocatalytic activity of TiO2 by B doping was discussed.

关 键 词：TIO2 硼 掺杂 溶胶-凝胶法 光催化活性 

分 类 号：O643.36[理学—物理化学]