新型特效Na离子吸附剂Li1+xAlxTi2-x(PO4)3的光谱研究

采用高温固相法合成了新型特效Na离子吸附剂Li1 xAlxTi2-x(PO4)3.用XRD,FTIR,Raman等手段研究了其结构形态;对材料的激光拉曼光谱和红外光谱进行了研究和指认;并对其吸附性能进行了研究.结果表明少量Al的加入未影响到LiTi2(PO4)3的晶体结构,但使Li1 xAlxTi2-x(PO4)3对Na离子产生了特效吸附作用,可用于高纯锂盐制备过程中微量杂质钠离子的分离.其最佳吸附条件为:当x=0.4时,在pH值为10.0～11.0条件下,Li1 xAlxTi2-x(PO4)3的吸附容量达到11.76 mg·g-1.

Spectral Studies of Novel Na Specific Adsorbent Li1+xAlxTi2-x(PO4)3

A novel Na specific adsorbent Li(1+x)Al(x)Ti(2-x)(PO4)3 was synthesized by high temperature solid state reaction method. The samples were characterized by X-ray diffraction(XRD) and scanning electron microscope(SEM). Raman and FTIR spectroscopic studies of these materials were carried out, and the vibrational bands were assigned. Their adsorption performances were investigated. The results indicate that the low concentration (x < 0.6) Al dopant does not affect the structure of the material but makes it able to selectively adsorb sodium. The adsorbing test results show that its exchange capacity is high with the maximum value of adsorption capacity of 11.76 mg x g(-1) at x = 0.4 and pH = 10.0-11.0. So it can be used to remove the microamounts impurity-sodium in the production of high purity lithium salt.