Abstract
Manganese oxide MnO2·H2O (H2MnO3) is regarded as a highly efficient adsorbent for lithium extraction from saltwater due to its superior theoretical adsorption capacity. The precursor Li2MnO3 for H2MnO3 is synthesized using a solid-phase method. X-ray diffraction results show that pure Li2MnO3 was obtained above the temperature of 600 °C. The resulting product after lithium removal through acid stripping is lamellar H2MnO3, with a delithiation rate of 76.5 % and a manganese dissolution loss rate of 2.98 %. The structure of the ion sieve was retained after acid washing. Furthermore, an adsorption amount of 12.3 mg/g is reached in a solution of 250 mg/L LiCl, and showing noteworthy selectivity for lithium in mixed ions solutions.
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