Doping engineering of lithium-aluminum layered double hydroxides for high-efficiency lithium extraction from salt lake brines
), Yunliang Zhao2,4(), Graphical Abstract
Abstract
Lithium-aluminum layered double hydroxides (LiAl-LDH) have been be successfully applied in commercial-scale for lithium extraction from salt lake brine, however, further advancement of their applications is hampered by suboptimal Li+ adsorption performance and ambiguous extraction process. Herein, a doping engineering strategy was developed to fabricate novel Zn2+-doped LiAl-LDH (LiZnAl-LDH) with remarkable higher Li+ adsorption capacity (13.4 mg/g) and selectivity (separation factors of 213, 834, 171 for Li+/K+, Li+/Na+, Li+/Mg2+, respectively), as well as lossless reusability in Luobupo brine compared to the pristine LiAl-LDH. Further, combining experiments and simulation calculations, it was revealed that the specific surface area, hydrophilic, and surface attraction for Li+ of LiZnAl-LDH were significantly improved, reducing the adsorption energy (Ead) and Gibbs free energy (ΔG), thus facilitating the transfer of Li+ from brine into interface followed by insertion into voids. Importantly, the intrinsic oxygen vacancies derived from Zn-doping depressed the diffusion energy barrier of Li+, which accelerated the diffusion process of Li+ in the internal bulk of LiZnAl-LDH. This work provides a general strategy to overcome the existing limitations of Li+ recovery and deepens the understanding of Li+ extraction on LiAl-LDH.
Keywords
Electronic Supplementary Material
References
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