文献类型：期刊文献

英文题名：Unexpected Selective Absorption of Lithium in Thermally Reduced Graphene Oxide Membranes

作者：Jiang, Jie[1,2];Mu, Liuhua[1,2];Qiang, Yu[3];Yang, Yizhou[3];Wang, Zhikun[4];Yi, Ruobing[1,2];Qiu, Yinwei[4];Chen, Liang[4];Yan, Long[1];Fang, Haiping[1,3]

机构：[1]Chinese Acad Sci, Shanghai Inst Appl Phys, Shanghai 201800, Peoples R China;[2]Univ Chinese Acad Sci, Beijing 100049, Peoples R China;[3]East China Univ Sci & Technol, Dept Phys, Shanghai 200237, Peoples R China;[4]Zhejiang A&F Univ, Dept Opt Engn, Zhejiang Prov Key Lab Chem Utilizat Forestry Biom, Hangzhou 311300, Peoples R China

年份：2021

卷号：38

期号：11

外文期刊名：CHINESE PHYSICS LETTERS

收录：;EI(收录号：20220311458074);WOS:【SCI-EXPANDED(收录号:WOS:000728375500001)】；

基金：Supported by the Fundamental Research Funds for the Central Universities, the National Natural Science Foundation of China (Grant Nos. 11974366, 11675246, 12074341, U1832170, and U1832150), the Key Research Program of Chinese Academy of Sciences (Grant No. QYZDJ-SSW-SLH053), the Computer Network Information Center of the Chinese Academy of Sciences, and the Shanghai Supercomputer Center of China.

语种：英文

外文关键词：Lithium compounds - Lithium-ion batteries - Positive ions - Graphene - Adsorption - Metals

摘要：Lithium plays an increasingly important role in scientific and industrial processes, and it is extremely important to extract lithium from a high Mg2+/Li+ mass ratio brine or to recover lithium from the leachate of spent lithium-ion batteries. Conventional wisdom shows that Li+ with low valence states has a much weaker adsorption (and absorption energy) with graphene than multivalent ions such as Mg2+. Here, we show the selective adsorption of Li+ in thermally reduced graphene oxide (rGO) membranes over other metal ions such as Mg2+, Co2+, Mn2+, Ni2+, or Fe2+. Interestingly, the adsorption strength of Li+ reaches up to 5 times the adsorption strength of Mg2+, and the mass ratio of a mixed Mg2+/Li+ solution at a very high value of 500 : 1 can be effectively reduced to 0.7 : 1 within only six experimental treatment cycles, demonstrating the excellent applicability of the rGO membranes in the Mg2+/Li+ separation. A theoretical analysis indicates that this unexpected selectivity is attributed to the competition between cation-pi interaction and steric exclusion when hydrated cations enter the confined space of the rGO membranes.