文献类型：期刊文献

英文题名：Li+ adsorption performance and mechanism using lithium/aluminum layered double hydroxides in low grade brines

作者：Zhong, Jing[1,2];Lin, Sen[1,3];Yu, Jianguo[1,3]

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

年份：2021

卷号：505

外文期刊名：DESALINATION

收录：;EI(收录号：20210709913496);WOS:【SCI-EXPANDED(收录号:WOS:000629378600002)】；

基金：Acknowledgement This work was sponsored by the National Natural Science Foundation of China (21978094, U20A20142) , and Major Science and Technology Projects of Qinghai Province (2019GXA7) .

语种：英文

外文关键词：Desorption; Washing; Structure stability; Column experiment; Ultrahigh Mg2+/Li+ ratio

摘要：Lithium/aluminum layered double hydroxides (Li/Al-LDHs) without elution damage, have been regarded as the most applicable adsorbents in the industrial lithium extraction from brines, while the low adsorption capacity and unclear adsorption/desorption mechanism are restraining their lithium extraction performance. In this study, Li/Al-LDHs with regular two-dimensional hexagonal flats, prepared by a simple coprecipitation method, demonstrated the highest Li+ adsorption capacity reported of 7.27 mg/g in the Qarhan Salt Lake old brine with an ultrahigh Mg2+/Li+ ratio at room temperature. Besides, the Li/Al-LDHs had a great adsorption selectivity to Li+ with the ion selective sequence of Li+ > Na+ > K+ > Ca2+ >> Mg2+, and the separation factor between Li+ and Mg2+ (alpha MgLi) reached up to 125. The adsorption capacity of Li/Al-LDHs exceeded 7.0 mg/g after 12 adsorptiondesorption cycles, showing a great stability on the adsorption performance and crystal structure. In addition, the adsorption-desorption column experiments manifested that the Li+ adsorbed on the Li/Al-LDHs could be eluted completely by neutral water and the Mg2+/Li+ ratio in the eluent reduced significantly to <0.43 from 301.58.