文献类型：期刊文献

英文题名：Quantitative effects of Fe3O4 nanoparticle content on Li+ adsorption and magnetic recovery performances of magnetic lithium-aluminum layered double hydroxides in 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：2020

卷号：388

外文期刊名：JOURNAL OF HAZARDOUS MATERIALS

收录：;EI(收录号：20200308043497);WOS:【SCI-EXPANDED(收录号:WOS:000524462500130)】；

基金：This work was sponsored by the National Natural Science Foundation of China (21978094, 51704121), the National Key R&D Program of China (2018YFC0604805), 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; Magnetic recovery; Desorption

摘要：The quantitative effects of magnetic Fe3O4 nanoparticle content on Li+ adsorption and magnetic recovery performances of magnetic lithium-aluminum layered double hydroxides (MLDHs) were investigated systematically. MLDHs with different Fe3O4 nanoparticle contents were synthesized by a staged chemical coprecipitation method. The property disparities of these MLDHs were analyzed by various characterizations and results proved the existence of magnetic nanoparticles had no impairment on MLDHs crystal structure stability while the mesopores were lessened with the increasing Fe3O4 contents. In adsorption experiments using Qarhan Salt Lake brine with Mg/Li mass ratio of 284, the Li+ adsorption capacity of MLDHs presented a downtrend with the increasing Fe3O4, while the increased magnetic components had positive influence on the Li+ separation with Mg2+ on account of the steric effect. MLDHs presented excellent Li+ selectivity that the Mg/Li mass ratio of desorption solution was significantly decreased below 7.0. Relying on the superparamagnetism, MLDHs recovery all exceeded 97 % in the external magnetic field for only 10 min, and the magnetic recovery performance was promoted with more Fe3O4 nanoparticles. Furthermore, on the basis of experimental data, precise models were built and described well the correlations of Fe3O4 contents of MLDHs with Li+ adsorption capacity and magnetic recovery rate, respectively.