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Selective Lithium Adsorption of Silicon Oxide Coated Lithium Aluminum Layered Double Hydroxide Nanocrystals and Their Regeneration
Author(s) -
Lee Yongju,
Cha JiHyun,
Jung DukYoung
Publication year - 2021
Publication title -
chemistry – an asian journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.18
H-Index - 106
eISSN - 1861-471X
pISSN - 1861-4728
DOI - 10.1002/asia.202100126
Subject(s) - lithium (medication) , inorganic chemistry , lithium hydroxide , aqueous solution , hydroxide , adsorption , chemistry , lithium vanadium phosphate battery , materials science , chemical engineering , electrochemistry , ion , ion exchange , organic chemistry , electrode , medicine , engineering , endocrinology
Silicon oxide‐coated lithium aluminum layered double hydroxide (Li x Al 2 ‐LDH@SiO 2 ) nanocrystals (NCs) are investigated to selectively separate lithium cations in aqueous lithium resources. We directly synthesized Li x Al 2 ‐LDH NC arrays by oxidation of aluminum foil substrate under a urea and lithium solution. Various lithium salts, including Cl − , CO 3 2− , NO 3 − , and SO 4 2− , were applied in aqueous solution to confirm the anion effect on the captured and released lithium quantity of the Li x Al 2 ‐LDH NCs. In a 5% solution of sulfate ions mix with lithium chloride, the Li x Al 2 ‐LDH NCs separated a larger quantity of lithium than in other anion conditions. To enhance regeneration stability and lithium selectivity, thin layers of SiO 2 were coated onto the Li x Al 2 ‐LDH nanostructure arrays for inhibition of nanostructure destruction after desorption of lithium cations in hot water. The Li x Al 2 ‐LDH@SiO 2 nanostructures showed enhanced properties for lithium adsorption, including increase of stable regeneration cycles from three to five cycles, and they showed high lithium selectivity in the Mg 2+ , Na + , and K + cation mixed aqueous resource. Our nanostructured LDH lithium adsorbents would provide a facile and efficient application for cost‐efficient and large‐scale lithium production.