{"title":"Steering interlayer interaction of lithium-aluminum layered double hydroxide beads for stable lithium extraction from sulfate-type brines","authors":"","doi":"10.1016/j.desal.2024.118130","DOIUrl":null,"url":null,"abstract":"<div><p>Lithium-aluminum layered double hydroxide (LiAl-LDH) is the most successful industrialized adsorbents for lithium extraction from salt lake brines with high Mg<sup>2+</sup>/Li<sup>+</sup> ratios. Nevertheless, its applications in SO<sub>4</sub><sup>2−</sup>-type brines hit an “Achilles heel”, i.e., the poor Li<sup>+</sup> extraction due to the desorption obstacle arising from spontaneous intercalation of SO<sub>4</sub><sup>2−</sup>. Herein, a novel strategy of steering interlayer interaction was developed by embedding portion of PO<sub>4</sub><sup>3−</sup> into interlayers of LiAl-LDH beads (BLDH-P). Owing to the lower binding energy (<em>E</em><sub>b</sub>) and stronger diffusion energy barrier of SO<sub>4</sub><sup>2−</sup> within interlayers, BLDH-P featured property of preventing SO<sub>4</sub><sup>2−</sup> intercalation, with the unchanged adsorption and desorption capacity in Lop Nor brine (the largest SO<sub>4</sub><sup>2−</sup>-type brine in the world) during the long-term recycling. BLDH-P also showed excellent Li<sup>+</sup> extraction performance, as the results of enlarged interlayer spacing and selective electrostatic repulsion. The static and dynamic Li<sup>+</sup> uptake reached 5.26 mg/g and 3.96 mg/g, with high separation factors of 39.84, 48.14, and 144.87 for Li<sup>+</sup>/K<sup>+</sup>, Li<sup>+</sup>/Na<sup>+</sup>, and Li<sup>+</sup>/Mg<sup>2+</sup>, respectively, superior to those of reported and commercialized LiAl-LDH. This work offers a feasible strategy of using interlayer modulation for long-term Li<sup>+</sup> extraction by LiAl-LDH from SO<sub>4</sub><sup>2−</sup>-type brines, and inspires the development and design of next-generation lithium adsorbents.</p></div>","PeriodicalId":299,"journal":{"name":"Desalination","volume":null,"pages":null},"PeriodicalIF":8.3000,"publicationDate":"2024-09-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Desalination","FirstCategoryId":"5","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0011916424008415","RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"ENGINEERING, CHEMICAL","Score":null,"Total":0}
引用次数: 0
Abstract
Lithium-aluminum layered double hydroxide (LiAl-LDH) is the most successful industrialized adsorbents for lithium extraction from salt lake brines with high Mg2+/Li+ ratios. Nevertheless, its applications in SO42−-type brines hit an “Achilles heel”, i.e., the poor Li+ extraction due to the desorption obstacle arising from spontaneous intercalation of SO42−. Herein, a novel strategy of steering interlayer interaction was developed by embedding portion of PO43− into interlayers of LiAl-LDH beads (BLDH-P). Owing to the lower binding energy (Eb) and stronger diffusion energy barrier of SO42− within interlayers, BLDH-P featured property of preventing SO42− intercalation, with the unchanged adsorption and desorption capacity in Lop Nor brine (the largest SO42−-type brine in the world) during the long-term recycling. BLDH-P also showed excellent Li+ extraction performance, as the results of enlarged interlayer spacing and selective electrostatic repulsion. The static and dynamic Li+ uptake reached 5.26 mg/g and 3.96 mg/g, with high separation factors of 39.84, 48.14, and 144.87 for Li+/K+, Li+/Na+, and Li+/Mg2+, respectively, superior to those of reported and commercialized LiAl-LDH. This work offers a feasible strategy of using interlayer modulation for long-term Li+ extraction by LiAl-LDH from SO42−-type brines, and inspires the development and design of next-generation lithium adsorbents.
期刊介绍:
Desalination is a scholarly journal that focuses on the field of desalination materials, processes, and associated technologies. It encompasses a wide range of disciplines and aims to publish exceptional papers in this area.
The journal invites submissions that explicitly revolve around water desalting and its applications to various sources such as seawater, groundwater, and wastewater. It particularly encourages research on diverse desalination methods including thermal, membrane, sorption, and hybrid processes.
By providing a platform for innovative studies, Desalination aims to advance the understanding and development of desalination technologies, promoting sustainable solutions for water scarcity challenges.