Development and Adsorption Properties for a Novel Lithium Ion-Sieve

The lithium ion-sieve precursor was prepared with LiOH and Mn (CH₃COO)₂ as the starting reagents, H₂O₂ as the oxidant and ethanol solution (volume percent 2.5%) as solution by combination of sol-gel, hydrothermal and low-temperature solid state methods, and then changed into lithium ion-sieve after eluting Li⁺ by the mixture of HCl and Na₂S₂O₈ solution. The influence of synthetic conditions on the structures and adsorption properties of lithium ion-sieve was investigated in detail. The results suggest that the pure phase lithium ion-sieve can be synthesized when Li/Mn molar ratio is 3/1, 3.2mL H₂O₂ is added after LiOH and Mn (CH₃COO)₂ react for 36h and the heat treatment way of programmed temperature from 410°C (2h) to 510°C (3h) is adopted in the progress of solid state reaction. The loss rate of dissolved Mn is less than 2.5% during pickling Li⁺. And the highest adsorption capacity can achieve 20.5mg/g.