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Title: Superior lithium adsorption and required magnetic separation behavior of iron-doped lithium ion-sieves

Journal Article · · Chemical Engineering Journal

The recent research on adsorption-based lithium recovery from lithium-containing solutions has been centred on adsorption capacity and separation of lithium ion-sieves powder from solutions. Herein, an effective iron-doped lithium titanium oxide (Fe-doped Li2TiO3) was synthesized by Fe-doping via solid state reactions followed by acid treatment to form iron-doped lithium ion-sieves (Fe/Ti-x(H)). The resulting solid powder displays both superior adsorption capacity of lithium and high separation efficiency of the adsorbent from the solutions. SEM imaging and BET surface area measurement results showed that at Fe doping levels x0.15, Fe-doping led to grain shrinkage as compared to Li2TiO3 and at the same time the BET surface area increased. The Fe/Ti-0.15(H) exhibited saturated magnetization values of 13.76 emu g-1, allowing effective separation of the material from solid suspensions through the use of a magnet. Consecutive magnetic separation results suggested that the Fe/Ti-0.15(H) powders could be applied at large-scale and continuously removed from LiOH solutions with separation efficiency of 96% or better. Lithium adsorption studies indicated that the equilibrium adsorption capacity of Fe/Ti-0.15(H) in LiOH 2 solutions (1.8 g L-1 Li, pH 12) reached 53.3 mg g-1 within 24 h, which was higher than that of pristine Li2TiO3 (50.5 mg g-1) without Fe doping. Competitive adsorption and regeneration results indicated that the Fe/Ti-0.15(H) possessed a high selectivity for Li with facile regeneration. Therefore, it could be expected that the iron-doped lithium ion-sieves have practical applicability potential for large scale lithium extraction and recovery from lithium-bearing solutions.

Research Organization:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Sponsoring Organization:
USDOE
DOE Contract Number:
AC05-76RL01830
OSTI ID:
1417438
Report Number(s):
PNNL-SA-131517; KP1704020
Journal Information:
Chemical Engineering Journal, Vol. 332, Issue C; ISSN 1385-8947
Publisher:
Elsevier
Country of Publication:
United States
Language:
English

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Cited By (4)

Liquid-Liquid Extraction and Chromatography Process Routes for the Purification of Lithium journal June 2019
2-Methylol-12-crown-4 ether immobilized PolyHIPEs toward recovery of lithium( i ) journal January 2018
Magneto Tuning of a Ferrite Dielectric Resonator Antenna Based on LiFe5O8 Matrix journal April 2018
Preparation of Ni-Doped Li2TiO3 Using an Inorganic Precipitation–Peptization Method journal October 2019

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