论文部分内容阅读
以钛酸丁酯为钛源采用水热法制备钛纳米管,用透射电镜和X射线衍射分析(XRD)表征材料的形貌和组成以及N_2吸附/脱附比表面积的测试,研究了钛纳米管对铀离子的吸附。结果表明,钛纳米管的外径为8 nm,管长度达2μm,由Na_2Ti_3O_7与H_3Ti_3O_7共存组成;吸附铀容量随着温度的升高、震荡时间的增加平缓升高,最大吸附pH值为5,饱和吸附容量达62.9 mg/g,吸附等温线符合Langmuir和Freundlich等温吸附模型。热力学研究表明,该吸附是吸热自发过程,回收率随着铀量的增加而逐步减小,吸附铀的钛纳米管比未吸附铀的比表面积小.
Titanium nanotubes were prepared by hydrothermal method using titanium tetrabutoxide as titanium source. The morphology and composition of the material were characterized by transmission electron microscopy and X-ray diffraction (XRD), and the adsorption / desorption specific surface area of N 2 was investigated. Tube Uranium ion adsorption. The results show that the outer diameter of titanium nanotube is 8 nm and the tube length is 2 μm, which is composed of Na_2Ti_3O_7 and H_3Ti_3O_7 coexisting. With the increase of temperature, the increase of the oscillation time increases slowly. The maximum adsorption pH value is 5, The saturated adsorption capacity reached 62.9 mg / g. The adsorption isotherms fit the Langmuir and Freundlich isothermal adsorption models. Thermodynamic studies show that the adsorption is a spontaneous endothermic process, the recovery rate decreases with the increase of the amount of uranium, titanium dioxide nanotubes adsorbed than non-adsorbed uranium specific surface area is small.