文献类型：期刊文献

英文题名：A one-step regeneration method in-situ for deactivated aluminum-based lithium adsorbent used in high Mg2+/Li+ brines

作者：Chen, Jun[1,2];Du, Jianglong[4];Yu, Jianguo[1,3];Lin, Sen[1,2]

机构：[1]East China Univ Sci & Technol, Natl Engn Res Ctr Integrated Utilizat Salt Lake Re, Shanghai 200237, Peoples R China;[2]East China Univ Sci & Technol, Engn Res Ctr Salt Lake Resources Proc Engn, Minist Educ, Shanghai 200237, Peoples R China;[3]East China Univ Sci & Technol, State Environm Protect Key Lab Environm Risk Asses, Shanghai 200237, Peoples R China;[4]East China Univ Sci & Technol, Shanghai Engn Res Ctr Hierarch Nanomat, Sch Chem & Mol Engn, State Key Lab Chem Engn, Shanghai 200237, Peoples R China

年份：2023

卷号：554

外文期刊名：DESALINATION

收录：;EI(收录号：20231013677649);WOS:【SCI-EXPANDED(收录号:WOS:000949953100001)】；

基金：This work was supported by the National Natural Science Foundation of China (21978094, U20A20142) , and Shanghai Rising-Star Program (22QA1402700) .

语种：英文

外文关键词：Lithium; aluminum layered double hydroxides; Lithium adsorbent; Deactivation; Gibbsite; Regeneration

摘要：Excessive Li+ deintercalation from the difficulty of precisely controlling desorption would lead to the deacti-vation of lithium/aluminum layered double hydroxide (Li/Al-LDH) as the aluminum-based lithium adsorbent in brines. In this study, a novel one-step regeneration method was established to in-suit recover the deactivated Li/ Al-LDH and was verified to be universally applicable for Li/Al-LDH with different forms and deactivation de-grees. It was witnessed the powdery and granulated Li/Al-LDH could be regenerated in less than 5 min and 2 h, respectively. The in-situ regeneration of deactivated granules was achieved in the fixed bed. Besides, high temperature, high Li+ concentration, alkalinity, and high ionic strength were conductive to the structural transformation of deactivated adsorbents from gibbsite (gamma-Al(OH)3) to active Li/Al-LDH and restore to normal Li+ adsorption capacity on account of the intercalation reaction of Li+ in gibbsite. Moreover, the regeneration mechanism was further illustrated in detail that Cl- and water molecules entered the interlayer as Li+ was inserted into the vacancies of deactivated adsorbent laminates to reconstruct Li/Al-LDH structure. This efficient regeneration method resolves the deactivation of Li/Al-LDH adsorbents, and is expected to be applied in the industrial lithium extraction to completely solve the insufficient long-term cycle stability caused by excessive desorption.