化工进展2024，Vol.43Issue(9)：5262-5274,13.DOI:10.16085/j.issn.1000-6613.2023-1393
锂铝层状双金属氢氧化物的制备及其锂脱嵌过程
Preparation of lithium aluminum layered double hydroxides and their lithium deintercalation performance
摘要
Abstract
lithium/aluminum layered double hydroxides(Li/Al-LDHs)is an adsorbent suitable for lithium extraction from high magnesium to lithium ratio brine.However,there are issues such as low adsorption capacity,unclear adsorption mechanism and insufficient understanding of applicable conditions.In this work,Li/Al-LDHs were prepared using aluminum powder and lithium hydroxide as raw materials.The applicable conditions and the influence of anions and cations in the solution on the adsorption process were investigated.The lithium extraction performance under different solution compositions was tested and the lithium desorption mechanism was characterized by FTIR and XPS.The results showed that the maximum adsorption capacity of Li/Al-LDHs in brine was 8.350mg/g,and the cation selectivity order was Li+>Na+>Mg2+>Ca2+>K+.The adsorption of Li+by Li/Al-LDHs followed the Langmuir isotherm adsorption model and the pseudo-second-order adsorption kinetics model.The adsorption process was mainly based on the sieving effect of size.When Li+entered the interlayer space of the adsorbent,an equal amount of anions(Cl-,SO42-,etc.)was needed to maintain charge balance.The lithium adsorption capacity increased with the increase of the total ion concentration in the solution,making it more suitable for lithium extraction from high salt content brines.This research findings can serve as valuable technical references for the subsequent utilization of Li/Al-LDHs derived from discarded aluminum metal in lithium extraction from salt lake brines.关键词
锂铝层状双金属氢氧化物(Li/Al-LDHs)/吸附剂/高镁锂比/吸附/锂提取Key words
lithium/aluminum layered double hydroxides(Li/Al-LDHs)/adsorbent/high magnesium to lithium ratio/adsorption/lithium extraction分类
化学化工引用本文复制引用
杨新衡,袁俊生,纪志永,郭志远,刘萁,张盼盼,汪婧,刘杰,毕京涛,赵颖颖..锂铝层状双金属氢氧化物的制备及其锂脱嵌过程[J].化工进展,2024,43(9):5262-5274,13.基金项目
国家自然科学基金(21978064) （21978064）
河北省自然科学基金(B2022202024,B2019202423). （B2022202024,B2019202423）
