文献类型：期刊文献

英文题名：A directional growth strategy for high layer charge Li/Al-LDHs to reinforce Li+ extraction in low-grade salt lake brines

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

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

年份：2024

卷号：70

期号：2

外文期刊名：AICHE JOURNAL

收录：;EI(收录号：20234314965201);WOS:【SCI-EXPANDED(收录号:WOS:001090797200001)】；

基金：This work was sponsored 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：layer charge; Li+ adsorption; lithium/aluminum layered double hydroxides; salt lake brine; structural stability

摘要：Novel Li/Al-LDHs with high layer charges (HCLDHs) were synthesized in the light of the inter-layer effect on Li+ adsorption. Compared with conventional low-charge Li/Al-LDHs (LCLDHs), HCLDHs exhibited a distinct micromorphology characterized by a preferential growth orientation along the c-axis and a significantly reduced lateral diameter. Adsorption experiments showed that HCLDHs possessed superior Li+ adsorption performance in various brines, specifically with a Li+ adsorption capacity of 9.72 mg/g in Qarhan old brine, surpassing that of LCLDHs by 2 mg/g. All-around characterizations and finite element analysis calculations uncovered that the reduced lateral dimensions facilitated the exposure of more accessible Li+ adsorption sites, while the high positive charge of the host layers decreased the electrostatic repulsion toward Li+ by attracting anions and increased the surrounding ionic strength. Surface photovoltage (SPV) and x-ray absorption fine structure (XAFS) further proved the structural stability of HCLDHs, which ensured the maintenance of a high Li+ adsorption capacity during adsorption-desorption cycles.