Unexpected Selective Absorption of Lithium in Thermally Reduced Graphene Oxide Membranes

doi:10.1088/0256-307X/38/11/116802

Chin. Phys. Lett.

2021, Vol. 38

Issue (11): 116802 DOI: 10.1088/0256-307X/38/11/116802

CONDENSED MATTER: STRUCTURE, MECHANICAL AND THERMAL PROPERTIES

Unexpected Selective Absorption of Lithium in Thermally Reduced Graphene Oxide Membranes

Jie Jiang^1,2†, Liuhua Mu^1,2†, Yu Qiang^3†, Yizhou Yang³, Zhikun Wang⁴, Ruobing Yi^1,2, Yinwei Qiu⁴, Liang Chen^4*, Long Yan^1*, and Haiping Fang^1,3*

¹Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China
²University of Chinese Academy of Sciences, Beijing 100049, China
³Department of Physics, East China University of Science and Technology, Shanghai 200237, China
⁴Department of Optical Engineering, Zhejiang Provincial Key Laboratory of Chemical Utilization of Forestry Biomass, Zhejiang A&F University, Hangzhou 311300, China

Cite this article:

Jie Jiang, Liuhua Mu, Yu Qiang et al 2021 Chin. Phys. Lett. 38 116802

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Abstract Lithium plays an increasingly important role in scientific and industrial processes, and it is extremely important to extract lithium from a high Mg$^{2+}$/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 Mg$^{2+}$. Here, we show the selective adsorption of Li$^{+}$ in thermally reduced graphene oxide (rGO) membranes over other metal ions such as Mg$^{2+}$, Co$^{2+}$, Mn$^{2+}$, Ni$^{2+}$, or Fe$^{2+}$. Interestingly, the adsorption strength of Li$^{+}$ reaches up to 5 times the adsorption strength of Mg$^{2+}$, and the mass ratio of a mixed Mg$^{2+}$/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 Mg$^{2+}$/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.

Received: 29 September 2021 Express Letter Published: 27 October 2021

Fund: 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.

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https://cpl.iphy.ac.cn/10.1088/0256-307X/38/11/116802 OR https://cpl.iphy.ac.cn/Y2021/V38/I11/116802

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	Jie Jiang
	Liuhua Mu
	Yu Qiang
	Yizhou Yang
	Zhikun Wang
	Ruobing Yi
	Yinwei Qiu
	Liang Chen
	Long Yan
	and Haiping Fang

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