水热法制备电气石/TiO_2纳米管及光催化性能  

Preparation of Tourmaline/TiO_2 Nanotube Composites by Hydrothermal Method and Its Photocatalytic Performance

作　　者：黄凤萍[1] 王帅[1] 张双[1] 王珍[1] 刘纯[2] 

机构地区：[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

出　　处：《硅酸盐学报》2015年第7期904-910,共7页Journal of The Chinese Ceramic Society

基　　金：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)

摘　　要：采用溶胶–凝胶法和水热法相结合制备了直径为18.8nm,管径为4.7nm,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1h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 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.

关 键 词：电气石 纳米二氧化钛 纳米管 光催化性能 

分 类 号：O643[理学—物理化学] TQ12[理学—化学]