Synthesis of Li2Ti1.5O4 and its Selectivity to Li+ Exchange

Abstract

The ion-exchanger Li₂Ti_1.5O₄ of spinel type was prepared by means of the solid state reaction crystallization method. Its ion-exchange properties for alkali ions such as saturation capacity of exchange and distribution coefficient were determined. Li₂Ti_1.5O₄ was characterized by X-ray diffraction method. The acid treatment of Li₂Ti_1.5O₄ causes Li⁺ extraction ratio to change from 50 to 90 %, while dissolution of Ti⁴⁺ is less than 7.5 %. This inorganic ion-exchanger (Li₂Ti_1.5O₄) has the saturation capacity of exchange for Li⁺ higher than those for other alkali ions, the saturation capacity of exchange for Li⁺ reaches to 7.4 mmol/g, LiTiO-775(H) has a higher selectivity of ion exchange for Li⁺ than for other alkali ions. These results show that LiTiO-775(H) has better memory and selectivity of ion exchange and higher capacity of ion exchange for Li⁺. It is a kind of prospective ionic sieve for Li⁺.