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水热法制备电气石/TiO2纳米管及光催化性能
作者:黄凤萍1 王帅1 张双1 王珍1 刘纯2 
单位:1. 陕西科技大学化学与化工学院 西安 710021  2. 咸阳陶瓷研究设计院 陕西 咸阳 712000 
关键词:电气石 纳米二氧化钛 纳米管 光催化性能 
分类号:O 643,TQ12
出版年,卷(期):页码:2015,43(7):904-910
DOI:10.14062/j.issn.0454-5648.2015.07.09
摘要:

 采用溶胶–凝胶法和水热法相结合制备了直径为18.8 nm,管径为4.7 nm,管长数百纳米的锐钛矿型电气石/TiO2纳米管。研究了水热反应时间、煅烧温度和电气石的添加量对制备样品的相结构和形貌的影响,同时以甲基橙为目标降解物考察了电气石/TiO2纳米管的光催化性能。结果表明:水热处理后,经500 ℃煅烧可得到一维结构优良的锐钛矿型电气石/TiO2纳米管,并且电气石与TiO2以Ti―O―Si键结合,由于电气石具有永久电极性,与TiO2的协同作用可以有效提高纳米TiO2的光催化性能。当电气石含量为0.5%(质量分数),500 ℃下煅烧的样品,光照1 h可达到最优降解率98.5%,比未经水热处理的纯纳米TiO2颗粒和经水热处理的纯纳米TiO2管分别提高了约44.9%和33.7%。

 Tourmaline/TiO2 nanotube composites with the average diameter of 18.8 nm and the length of several hundred nanometers were prepared by a modified sol-gel method and a hydrothermal method. The tourmaline/TiO2 nanotube has an anatase crystal structure. Effects of hydrothermal reaction time, calcination temperature and amount of tourmaline on the phase structure, morphology and of the as-prepared composites were investigated. The photocatalytic activity of the tourmaline/TiO2 nanotube composites was inspected using methyl orange. The results indicate that after hydrothermal reaction for 2 h, the nanotube composites calcined at 500℃ can have one-dimensional structure of TiO2 with anatase crystals and the Ti−O−Si. The addition of a small amount of tourmaline as permanent electrodes can improve the photocatalytic properties of nano-TiO2 effectively. When the amount of tourmaline is 0.5% (in mass fraction), the maximum photocatalytic activity of the tourmaline/TiO2 nanotube composites calcined at 500 ℃ is 98.5%, which is greater than that of the pure TiO2 prepared by modified sol-gel (i.e., 44.9%) and the pure TiO2 deal with hydrothermal (i.e., 33.7%), respectively.

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基金项目:
陕西省自然科学基础研究计划项目(014JM2035);“十二五”国家科技支撑计划项目(2013BAJ01B02)。
作者简介:
黄风萍(1967—),女,博士,教授。
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