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电化学阳极氧化金属钛箔制备TiO2纳米管阵列和光催化特性

发表时间:2009-08-15  浏览量:1499  下载量:493
全部作者: 王延宗,李大鹏,祝巍,洪勋,王冠中
作者单位: 中国科技大学物理系;淮阴工学院计算科学系
摘 要: 在含有NH4F的乳酸电解液中,阳极氧化金属钛箔制备了高度有序的TiO2纳米管阵列,并研究了不同阳极氧化电压、NH4F浓度和阳极氧化时间对纳米管阵列形貌的影响;通过变化阳极电压,使纳米管内径从50 nm(15 V)变化到148 nm(40 V).通过长时间的阳极氧化,单根纳米管变为相互只有很少连接(甚至独立)的纳米环。长时间阳极氧化(24 h)可以使纳米管的长度达到约2�7 μm� 在实验中所用的浓度范围内(质量分数0�1%~2�5%),NH4F的浓度对纳米管管径影响很小,但是小于等于0�1%的浓度会使样品的表面覆盖一层沉积物。利用罗丹明B(RhB)在紫外光照射下的降解作为指标,测定了TiO2纳米管阵列的光催化活性。在相同的紫外光照射下,50 mL0�01 mmol/L罗丹明B水溶液中加入面积为7 cm2的纳米管阵列的降解速率为只有紫外光时的47�4倍。
关 键 词: 凝聚态物理学;TiO2;纳米管;阳极氧化;光催化
Title: Fabrication and photocatalysis of TiO2 nanotube arrays by a Ti foil anodic oxidation in NH4F�containing lactic acid electrolyte
Author: WANG Yanzong, LI Dapeng, ZHU Wei, HONG Xun, WANG Guanzhong
Organization: Department of Physics, University of Science and Technology of China;Department of Computer Engineering, Huaiyin Institute of Technology
Abstract: The paper fabricates high ordered TiO2 nanotube arrays by an anodic oxidation of Ti foils in a NH4F and lactic acid solution. This method makes it possible to prepare quite long TiO2 nautubes with high surface ratio and very thin shells. The inner diameter of the nanotubes varies within 50~148 nm through adjusting the anodic voltage. Long time anodic oxidation could make the nanotube a structure of linked nanorings, or even some independent nanorings� The paper also shows that the NH4F concentration within the possible selection in the experiment does not affect the diameter of the nanotubes� However, a layer of sediment could be formed on the top of the nanotube arrays when NH4F weight concentration is lower than 0�1%� The photocatalysis of the TiO2 nanotube arrays is characterized by the degradation of RhB aqueous solution exposed to ultraviolet light� The degradation rate of a 7 cm2 TiO2 nanotube array in a 50 mL solution (0�01 mmol/L) is 47�4 times as fast as that of the dye solution exposed to ultraviolet light alone�
Key words: condensed state physics; TiO2; nanotube; anodic oxidation; photocatalysis
发表期数: 2009年8月第15期
引用格式: 王延宗,李大鹏,祝巍,等. 电化学阳极氧化金属钛箔制备TiO2纳米管阵列和光催化特性[J]. 中国科技论文在线精品论文,2009,2(15):1578-1584.
 
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