TiO_2纳米管的结构特征对其光电催化性能的影响  

Effects of structural features of titania nanotube on its photoelectrocatalytic performance

作　　者：李运林[1,2,3] 张超[1,2,3] 杨捷[1,2,3] 周明华[1,2,3] 

机构地区：[1]南开大学环境污染过程与基准教育部重点实验室,天津300071 [2]天津市城市生态环境修复与污染防治重点实验室,天津300071 [3]南开大学环境科学与工程学院,天津300071

出　　处：《功能材料》2013年第B06期120-125,共6页Journal of Functional Materials

基　　金：国家自然科学基金资助项目(51178225);教育部博士点基金资助项目(20110031110025);天津市自然科学基金资助项目(09JCYBJC08000)

摘　　要：研究了利用电化学阳极氧化法在不同的氧化电压和氧化时间条件下制备的TiO2纳米管(TNT)的结构特征对其光电催化性能的影响。运用场发射扫描电子显微镜,X射线衍射和X射线光电子能谱分析等手段对其进行表征,考察了其光电化学性质,研究了具有不同纳米结构特征的TiO2纳米管降解甲基橙染料废水的反应动力学性能。结果表明,TiO2纳米管的长径比对其光电催化性能影响最大。其管长和管径随着氧化电压和氧化时间的增大而增大,壁厚随着氧化电压的增大而减小。在其管长为25.85μm、壁厚为10.23nm、长径比为178、粗糙系数为175的条件下具有最大光电流密度4.8×10-2 mA/cm2,对甲基橙(MO)光电催化降解拟一级反应动力学常数达到最大值2.26×10-3/min。The effect of structural features of titania nanotube arrays fabricated by anodization under different an- odizing voltages and anodizing times on its photoelectrocatalytic performance was investigated. Characterized by transmission electron microscopy,X ray diffraction, X-ray photoelectron spectroscopy, the photoelectrochemi- cal properties, the photoelectrocatalytic activity of titania nanotube arrays with different nanostructure features, the reaction kinetics performance of its for the degradation of methyl orange were investigated. These results demonstrated that the aspect ratio of titania nanotube arrays has a maximum impact on its photoelectrocatalytic performance. The nanotube length and diameter of titania nanotubes increased with the increase of anodizing voltage and anodizing time, and the wall thickness of titania nanotube decreased with the increase of anodizing voltage. Titania nanotube with tube length of 25.85ffm, wall thickness of 10.23nm, roughness factor＇ of 175 and aspect ratio of 178 fabricated at 60V for 6h possessed the maximum photocurrent density of 4.8X 10 2mA/ cm2,and the maximum first order reaction kinetic constant of degradation of methyl orange was 2. 26 X 10 3 min-1.

关 键 词：TIO2纳米管 光电催化 长径比 甲基橙 

分 类 号：O614[理学—无机化学]