Abstract
To mitigate the growing pressure of lithium resource supply and requirement, the exploration of abundant lithium from salt lake brine has emerged as a novel avenue for lithium resource acquisition. Surface ion imprinting technology with specific recognition could achieve selective lithium adsorption. However, existing Li+-imprinted adsorption materials exhibit poor adsorption performance and difficult recovery. To address these issues, the novel recyclable Li+-imprinted graphene aerogels were synthesized by using graphene oxide as the skeleton material, and thiourea dioxide as the reducing agent, assisted by DMF and NH3·H2O. The imprinted aerogels demonstrate excellent structural stability (bearing 10000 times of its weight), superior adsorption capacity (31.66 mg g−1), high selectivity and good regeneration performance (91.0% after six cycles). The selection factors for Li+ over Na+, K+ and Mg2+ reach 10.00, 5.71 and 4.00, respectively. This is attributed to the strong metal coordination interreaction between 2-Hydroxymethyl-12-crown-4 and Li+, thereby specifically recognizing and adsorbing Li+. This research offers a fresh material for the enrichment and recovery of lithium resources in salt lake brine.
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