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Partic. vol. 41 pp. 40-47 (December 2018)
doi: 10.1016/j.partic.2018.02.001

Lithium adsorption from brine by iron-doped titanium lithium ion sieves

Shulei Wanga,b,1, Xin Chenc,1, Ying Zhanga, Yang Zhanga, Shili Zhenga,*

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slzheng@ipe.ac.cn

Highlights

    • Iron-doped lithium ion sieves were synthesized via solid-state reaction at 600 °C and Fe/Ti = 0.15. • The synthesized sieves had Li+ adsorption capacity of ∼35 mg/g in brines. • The synthesized ion sieves exhibited a high selectivity to Li+ and steady recyclability.

Abstract

Iron-doped lithium titanium oxides were prepared via a solid-state reaction and transformed into lithium ion sieves by acid treatment. Scanning electron microscopy, X-ray photoelectron spectroscopy, and transmission electron microscopy showed that Fe3+ was doped into the Ti–O lattice and Ti–Fe–O bonds were formed. Iron-doping improved lithium ion adsorption from brines. The saturated adsorption capacity of the iron-doped ion sieves in brine (Li+ 1.56 g/L, pH = 8.8) was 34.8 mg/g. Lithium ion adsorption fitted pseudo-second-order kinetic and Langmuir equations, indicating that lithium ion adsorption on iron-doped lithium ion sieves was chemical and predominantly monolayer. In addition, the iron-doped ion sieves showed excellent selectivity for lithium ion and good recyclability. These iron-doped ion sieves therefore provide effective lithium adsorbents for practical applications.

Graphical abstract

Keywords

Iron-doped; Lithium ion sieves; Brine; Adsorption