文献类型：期刊文献

英文题名：Electrochemical and adsorption behaviour of Li+, Na+, K+, Ca2+, and Mg2+ in LiMn2O4/λ-MnO2 structures

作者：Liu, Dong-Fan[1];Sun, Shu-Ying[1];Yu, Jian-Guo[1]

机构：[1]East China Univ Sci & Technol, Natl Engn Res Ctr Integrated Utilizat Salt Lake R, Shanghai 200237, Peoples R China

年份：2019

卷号：97

期号：S1

起止页码：1589

外文期刊名：CANADIAN JOURNAL OF CHEMICAL ENGINEERING

收录：;EI(收录号：20185206315233);WOS:【SCI-EXPANDED(收录号:WOS:000468474400037)】；

基金：The research was supported by the National Key R&D Program of China (2017YFB0603104) and NSFC (U1407120, U1707601).

语种：英文

外文关键词：lithium recovery; ion-sieve; electrically switched ion exchange; adsorption; desorption

摘要：Manganese dioxide ion-sieves are known to be highly efficient lithium adsorbents, owing to their high adsorption capacity and selectivity. However, their manganese dissolution rate during acid desorption is high. Therefore, electrically switched ion exchange (ESIX) was proposed to recover Li+ from brine. Cyclic voltammetry results indicated that ESIX could be applied to capture lithium from the Li+-containing solutions. Besides, the electrochemical behaviour of Li+ in LiMn2O4/lambda-MnO2 structures was studied, wherein Na+, K+, Ca2+, and Mg2+ naturally coexisted with Li+ in the brine. No redox peaks were observed between 0.3-1.2 V in the MCl solution (MCl = NaCl, KCl, CaCl2, and MgCl2), and the positions of the redox peaks in the LiCl solution were similar to those in the LiCl and MCl mixed solution, indicating that Na+, K+, Ca2+, and Mg2+ barely interacted with the lambda-MnO2 electrode under the experimental conditions. Based on the experimental results, the Li+ adsorption capacity was determined to be similar to 2 mmol center dot g(-1), and the selectivity coefficients of Li+ for Na+, K+, Ca2+, and Mg2+ were 38.78, 35.63, 29.04, and 120.08, respectively. Furthermore, by using ESIX, the Li+ adsorption capacity of the lambda-MnO2 electrode was 82.8 % of its initial value after 50 adsorption-desorption cycles. Thus, we concluded that ESIX involving an lambda-MnO2 electrode can be used to separate Li+ from brine with excellent selectivity coefficients.