锐钛矿纳米管的微波水热制备及其吸附-光催化性能  

Microwave Hydrothermal Synthesis of Anatanse Nanotubes and Their Photocatalytic Performance

作　　者：钮金芬[1] 姚秉华[1] 彭超[1] 张凡宏[1] 

机构地区：[1]西安理工大学理学院应用化学系,西安710054

出　　处：《硅酸盐学报》2013年第1期83-88,共6页Journal of The Chinese Ceramic Society

基　　金：高等学校博士点学科专项科研基金(20096118110008);陕西省科技厅社发攻关基金(2011K17–03–02);西安理工大学优秀博士学位论文研究基金(108–211005)项目资助;陕西省教育厅科学研究基金(12JK0606)

摘　　要：以锐钛矿TiO2颗粒(TO)为前驱体,经浓碱水热制得钛酸盐纳米管(TNT),之后采用微波水热法制备锐钛矿纳米管(WTNT)材料。用X射线衍射分析、透射电子显微镜和紫外-可见漫反射对样品进行了表征。研究了所制备材料对四环素的吸附-光催化降解性能。结果表明:在2.0MPa条件下合成的WTNT为纯锐钛矿相;经过微波水热后的WTNT仍为中空管状结构,其外径约为10nm,管长100～200nm;TNT和WTNT的禁带宽度均大于前驱体TO的带隙;3种催化剂对四环素的吸附过程均服从准二级动力学过程;WTNT在3种催化剂中表现出对四环素最好的光降解效果。Titanate nanotubes （TNT） were firstly prepared with anatanse particles （TO） as a precursor by a concentrated alkaline hydrothermal method, and then anatanse titania nanotubes （WTNT） were synthesized with TNT as a raw material by a microwave hydrothermal method. The adsorption and photocatalytic degradation performance of tetracycline hydrochloride （TC） were-evaluated under dark condition and visible light irradiation. The products were characterized with X-ray diffraction, transmission electron microscope, and UV-visible diffuse reflectance spectroscopy, respectively. The results show that the as-prepared WTNT samples synthesized under 2.0 MPa is single-crystalline anatase. The WTNT samples treated after microwave hydrothermal treatment appear a hollow tubular structure with the outer diameter of 10 nm and the length of approximately 100-200 nm. The band gap of TNT and WTNT are greater than that of TO precursor. The adsorption process of TC on three catalysts can be described by a pseudo-second-order kinetics model. The WTNT exhibits a superior photocatalytic degradation capability to TC under visible light irradiation.

关 键 词：微波水热 锐钛矿 纳米管 四环素 吸附 光催化 

分 类 号：O643[理学—物理化学]