Abstract
With the depletion of solid lithium ore, extracting lithium from salt lake brine has become a critical focus for future endeavors. A four-step method was used to synthesize high-purity H(1.6)Mn(1.6)O(4) for extracting Li(+). Porous cubic Mn(2)O(3) was hydrothermally synthesized with carbon spheres and surfactants as templates. Then, it was converted to LiMnO(2) by calcining with Li(2)CO(3). After roasting and acid pickling, H(1.6)Mn(1.6)O(4) was successfully synthesized. The impacts of calcination temperature, Li/Mn molar ratio and glucose addition on LiMnO(2) composition, loss percentage of dissolved Mn in precursor, and the adsorption characteristics of the lithium ion sieve were studied. Glucose inhibited the formation of LiMn(2)O(4) and promoted the formation of pure LiMnO(2). The resulting precursor without impurities showed porous structure. After acid pickling, H(1.6)Mn(1.6)O(4) showed a high-adsorption performance and excellent cycle performance. After five cycles, adsorption capacity remained above 30 mg/g, and the loss percentage of dissolved Mn stabilized at about 1%. The Li(+)-H(+) exchange conformed to pseudo-second-order adsorption dynamics and the Langmuir adsorption isotherm equation, indicating that the adsorption process can be classified as monolayer chemical adsorption.