Doping engineering of lithium-aluminum layered double hydroxides for high-efficiency lithium extraction from salt lake brines  

作　　者：Lingjie Zhang Tingting Zhang Yunliang Zhao Guangfeng Dong Shuaike Lv Songliang Ma Shaoxian Song Mildred Quintana 

机构地区：[1]School of Chemical and Environmental Engineering,Wuhan Polytechnic University,Wuhan 430023,China [2]School of Resources and Environmental Engineering,Wuhan University of Technology,Wuhan 430070,China [3]Facultad de Ciencias,Universidad Autonoma de San Luis Potosi,Av.Parque Chapultepec 1570,San Luis Potosi 78210,Mexico [4]Wuhan Clayene Technology Co.,Ltd.,Wuhan 430223,China [5]State Development Investment Xinjiang Lop Nur Potash Corporation,Hami 839000,China

出　　处：《Nano Research》2024年第3期1646-1654,共9页纳米研究（英文版）

基　　金：supports for this work from National Key R&D Program of China(No.2022YFC2906300);the National Natural Science Foundation of China(No.52204283);the Natural Science Foundation of Hubei Province of China(No.2021CFB554);the Key Project of the Science and Technology Research of Hubei Provincial Department of Education(No.D20221605);the CONACYT through the project A1-S-8817.L.J.Z.would like to thank CONACYT for the scholarship for granting his the scholarship No.847199 during his Ph.D study.

摘　　要：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 Zn^(2+)-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^(+)/Mg^(2+),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.

关 键 词：lithium extraction salt lake brines doping engineering lithium-aluminum layered double hydroxides density functional theory 

分 类 号：O64[理学—物理化学]