文献类型：期刊文献

英文题名：Regulating lithium extraction based on intercalated SO42-in Li/Al-LDHs

作者：Chen, Jun[1,3];Yuan, Hengfeng[2];Yu, Jianguo[1,3];Yan, Meng[5];Yang, Yong[5];Lin, Sen[1,4]

机构：[1]East China Univ Sci & Technol, Natl Engn Res Ctr Integrated Utilizat Salt Lake Re, Shanghai, Peoples R China;[2]Shanghai Jiao Tong Univ, Inst Microsurg Extrem, Affiliated Peoples Hosp 6, Shanghai 200233, Peoples R China;[3]East China Univ Sci & Technol, State Environm Protect Key Lab Environm Risk Asses, Shanghai, Peoples R China;[4]Shanghai Inst Pollut Control & Ecol Secur, Shanghai, Peoples R China;[5]Northwestern Polytech Univ Shenzhen, Res & Dev Inst, Shenzhen 518057, Guangdong, Peoples R China

年份：2023

卷号：649

起止页码：694

外文期刊名：JOURNAL OF COLLOID AND INTERFACE SCIENCE

收录：;EI(收录号：20232614311989);WOS:【SCI-EXPANDED(收录号:WOS:001037664400001)】；

基金：This work was sponsored by the National Natural Science Foundation of China (21978094, U20A20142), Shanghai Rising-Star Program (22QA1402700) and Shenzhen Science and Technology Program (JCYJ20210324142805014).

语种：英文

外文关键词：Li; Al-LDHs; Lithium extraction; Interlayer anion exchange; Adsorption

摘要：Reasonable construction of Li/Al-LDHs with interlayer anions is essential to improve the adsorption performance, especially for intercalating SO42-anions and blocking Li+ desorption. Hence, anion exchange between Cland SO42- in the interlayer of Li/Al-LDHs was designed and prepared to demonstrate the strong exchangeability of SO42- for Cl- intercalated in the Li/Al-LDH interlayer. Intercalated SO4 2-enlarged the interlayer spacing and significantly transformed the stacking structure of Li/Al-LDHs, resulting in fluctuating adsorption performance with changes in the intercalated SO4 2-content at different ionic strengths. What is more, SO42- repelled the intercalation of other anions, thus inhibiting Li+ adsorption, as verified by the negative correlation between adsorption performance and intercalated SO42- content in high-ionic-concentration brines. Desorption experiments further revealed that enhanced electrostatic attraction between SO42- and the Li/Al-LDH laminates hindered Li+ desorption. Additional Li+ in the laminates was essential for preserving the structural stability of Li/AlLDHs with higher SO42- contents. This work provides a new insight into the development of functional Li/AlLDHs in ion adsorption and energy conversion applications.