文献类型：期刊文献

英文题名：Lithium extraction process from low grade Na+/K+ brines dependent on high layer charge layered double hydroxides

作者：Sheng, Bingchun[1,2];Su, Haiping[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 200237, Peoples R China;[2]East China Univ Sci & Technol, State Environm Protect Key Lab Environm Risk Asses, Shanghai 200237, Peoples R China;[3]East China Univ Sci & Technol, Shanghai Engn Res Ctr Hierarch Nanomat, State Key Lab Chem Engn, Shanghai 200237, Peoples R China;[4]Shanghai Inst Pollut Control & Ecol Secur, Shanghai 200092, Peoples R China

年份：2023

卷号：565

外文期刊名：DESALINATION

收录：;EI(收录号：20233014433296);WOS:【SCI-EXPANDED(收录号:WOS:001047300100001)】；

基金：This work was supported 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：High layer charge; Li; Al-LDHs; Na; K plus brines; Lithium extraction; Adsorption; Layered double hydroxides

摘要：To meet the rigorous separation demand for lithium in monovalent ion systems, high layer charge layered double hydroxides (H-LDHs) were used to extract lithium resource from Na+/K+ brines dependent on a stronger Li+ adsorption effect than conventional Li/Al-LDHs. Adsorption kinetics, isotherms and selectivity of H-LDHs were thoroughly investigated and it was found that H-LDHs had a high selectivity to Li+, and could extract the low concentration Li+ in 3 M Na+/K+ brines in <30 min. Additionally, the effects of desorption temperature and initial Li+ concentration in the eluent were explored in detail. It could be clearly seen that the Li+ desorption rate was increased with less Li+ in the eluent and higher desorption temperature, and the Li/Al molar ratios of H-LDHs dramatically decreased after desorption as the initial Li+ concentration in the eluent was lower than 100 mg/L. Under optimal conditions, the Li+ adsorption capacities of H-LDHs always maintained >4.0 mg/g in 10 adsorption-desorption cycles, reflecting a great stability on the adsorption performance and the crystal structure. These experimental results confirmed great potential application prospects of H-LDHs in lithium extraction from Na+/K+ brines.