TiO_2纳米管的水热法合成研究  

The preparation of TiO_2-nanotube by hydrothermal method

作　　者：周艺[1] 黄可龙[1] 朱志平[2] 马儒[2] 

机构地区：[1]中南大学化学化工学院,湖南长沙410083 [2]长沙理工大学化学与环境工程学院,湖南长沙410076

出　　处：《长沙理工大学学报（自然科学版）》2007年第4期86-90,共5页Journal of Changsha University of Science and Technology:Natural Science

基　　金：湖南省自然科学基金资助项目(06JJ50157);湖南省科技厅科技攻关项目(2007FJ3084)

摘　　要：采用水热法合成了外径约为15 nm、壁厚约为1 nm的TiO2纳米管.通过采用TEM,XRD,TG-DSC等分析手段,对在不同工艺条件下获得的产物进行了表征,并对其光催化活性进行评价.研究结果表明,反应时间和反应温度对样品的结构和光催化活性有较大影响;TiO2纳米管的形成机理可能是氧化钛颗粒在强碱的作用下形成具有层状结构的碱金属钛盐,随着反应的进行逐渐卷曲而形成纳米管,这种自发的卷曲可能是由于弹性形变等多种因素的共同作用下以降低能量使其结构更稳定所致.经过酸处理以后可以得到含有H2TiO3组分的纳米管,该纳米管在300℃热处理后,H2TiO3受热分解转化为锐钛矿型的TiO2.The TiO2-nanotube with external diameter is about 15 nm and the wall thickness is about 1 nm are prepared by hydrothermal method,its property is characterized by TEM,XRD,TG-DSC;its photocatalysis activity is evaluated by the photodegradation of methyl orange in an aqueous solution under visible light irradiation.The analysis results show that synthesis time and temperature had greatly effects on TiO2-nanotubes structure and photocatalysis activity.The TiO2-nanotube＇s formation mechanism may be formed as following：the TiO2 particles in the alkali can form layered structure,the layered structure gradually curls and a nanotube is produced.Such spontaneous curling may be caused by elastic deformation and the energy can be decreased,its structure may be more stable.In acidic conditions,TiO2-nanotube may contain H2TiO3 component,but H2TiO3 can be transformed into anatase TiO2 by being calcined at 300 ℃.

关 键 词：水热法 二氧化钛纳米管 合成 光催化 

分 类 号：O646[理学—物理化学]