Issue 23, 2014

Lithium recovery from salt lake brine by H2TiO3

Abstract

The details of the ion exchange properties of layered H2TiO3, derived from the layered Li2TiO3 precursor upon treatment with HCl solution, with lithium ions in the salt lake brine (collected from Salar de Uyuni, Bolivia) are reported. The lithium adsorption rate is slow, requiring 1 d to attain equilibrium at room temperature. The adsorption of lithium ions by H2TiO3 follows the Langmuir model with an adsorptive capacity of 32.6 mg g−1 (4.7 mmol g−1) at pH 6.5 from the brine containing NaHCO3 (NaHCO3 added to control the pH). The total amount of sodium, potassium, magnesium and calcium adsorbed from the brine was <0.30 mmol g−1. The H2TiO3 was found capable of efficiently adsorbing lithium ions from the brine containing competitive cations such as sodium, potassium, magnesium and calcium in extremely large excess. The results indicate that the selectivity order Li+ ≫ Na+, K+, Mg2+, Ca2+ originates from a size effect. The H2TiO3 can be regenerated and reused for lithium exchange in the brine with an exchange capacity very similar to the original H2TiO3.

Graphical abstract: Lithium recovery from salt lake brine by H2TiO3

Article information

Article type
Paper
Submitted
13 Feb 2014
Accepted
15 Apr 2014
First published
15 Apr 2014

Dalton Trans., 2014,43, 8933-8939

Author version available

Lithium recovery from salt lake brine by H2TiO3

R. Chitrakar, Y. Makita, K. Ooi and A. Sonoda, Dalton Trans., 2014, 43, 8933 DOI: 10.1039/C4DT00467A

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