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Abstract: In this work, we developed low-cost and highly effective lithium-imprinted polymers (IIPs) by using vermiculite and dibenzo-14-crown-4 as the carrier and the chelating reagent, respectively, to recover lithium resources. Vermiculite was pretreated by HNO3 vapor and ultrasound waves to improve its properties. The maximum adsorption capacity of IIPs reached 2852.61 μmol/g under the optimal adsorption conditions. The homogeneous binding sites of IIPs can be well proved by the Langmuir isotherm model. In the presence of Na+, K+, and Mg2+, IIPs still maintained good selectivity for Li+, and the related separation factors toward Li+ were all higher than 3.5. Moreover, used IIPs can be efficiently regenerated by 1 M HNO3, and the Li+ adsorption capacity only decreased 13.1% after 10 experiment cycles. The results demonstrate that IIPs have stable adsorption and ideal selectivity. Therefore, they have the potential to be applied to extract Li+ for producing battery-grade lithium products
Template and target information: lithium ion, Li(I)