Abstract
The ion-exchanger LiAlTiO4 of spinel type was prepared by the common precipitation/hydrothermal crystallization method, and was acid-modified. Its ion-exchange properties for alkali ions such as saturation capacity of exchange, distribution coefficient and pH titration curve were determined. LiAlTiO4 was characterized by the X-ray diffraction method. The acid treatment of LiAlTiO4 caused Li+ extraction ratio to change from 28% to 72%, while the dissolution of Al is less than 6.8%. This inorganic ion-exchanger (LiAlTiO4-700) has a higher saturation capacity of exchange for Li than for other alkali ions, the saturation capacity of exchange for Li+ reaches 4.29 mmol/g (30.03 mg/g); LiAlTiO4-700(H) has a higher selectivity of ion exchange for Li+ than for other alkali ions. These results show LiAlTiO4-700(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+.
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