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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 (TNTs) were prepared by hydrothermal titration of anatase TiO2 particles (TO) as precursors. Then, anatase nanotubes (WTNTs) were prepared by microwave hydrothermal method. The samples were characterized by X-ray diffraction analysis, transmission electron microscopy and UV-vis diffuse reflectance. Adsorption-photocatalytic degradation of tetracycline by the prepared materials was studied. The results showed that the WTNT synthesized at 2.0MPa was of pure anatase phase. After microwave hydrothermal treatment, the WTNT was still a hollow tubular structure with an outer diameter of about 10nm and a tube length of 100-200nm. The band gaps of TNT and WTNT The widths of the three catalysts were all larger than that of the TO precursor. The adsorption of tetracycline by the three catalysts all obeyed the quasi-second order kinetics. WTNT exhibited the best photodegradation of tetracycline among the three catalysts.