文献类型：期刊文献

英文题名：High-selective cyclic adsorption and magnetic recovery performance of magnetic lithium-aluminum layered double hydroxides (MLDHs) in extracting from ultrahigh Mg/Li+ ratio brines

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

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

年份：2021

卷号：255

外文期刊名：SEPARATION AND PURIFICATION TECHNOLOGY

收录：;WOS:【SCI-EXPANDED(收录号:WOS:000633043300003)】；

基金：This work was sponsored by the National Natural Science Foundation of China (21978094, 51704121) and Major Science and Technology Projects of Qinghai Province (2019-GX-A7).

语种：英文

外文关键词：Ultrahigh Mg/Li ratio brine; Lithium adsorbents; Lithium-aluminum layered double hydroxides; Adsorption performance; Magnetic recovery

摘要：The lithium-aluminum layered double hydroxides (Li/Al-LDHs) have been proved to be feasible to efficient lithium extraction from low-grade brines with ultrahigh Mg/Li ratios as Li+ adsorbents without elution damages. In this study, considering a sharp decline on the adsorption capacity resulting from the granulation in industrial applications, novel adsorbents, magnetic Li/Al layered double hydroxides (MLDHs), were synthesized via a simple staged coprecipitation method. The characterization and adsorption results proved doped Fe3O4 nanoparticles as magnetic cores were not harmful to the crystal phase and stability of the effective adsorption component Li/Al-LDHs in MLDHs. MLDHs exhibited favorable selective and preferential adsorption for Li+ in the Qarhan Salt Lake old brine with Mg/Li mass ratio of 284, whose adsorption capacity reached up to about 6.0 mg/g and Mg/Li ratios in desorption solution less than 0.4 with recovered Mg/Li ratios less than 6.0. By virtue of the superparamagnetism of Fe3O4 nanoparticles, a rapid recovery of MLDHs from brines after adsorption could be achieved easily using an external magnetic field. Furthermore, after 8 adsorption-desorption cycles, both the adsorption capacity and crystal structure of MLDHs had no significant change, indicating the great potential in the industrial lithium extraction from brines involving long-term recycling for adsorbents.