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4268644 
Journal Article 
Selective lithium recovery from aqueous solution using a modified membrane capacitive deionization system 
Lee, DHee; Ryu, T; Shin, J; Ryu, JaeC; Chung, KSup; Kim, YHo 
2017 
Yes 
Hydrometallurgy
ISSN: 0304-386X 
173 
283-288 
WOS:000413056600033 
Selective lithium recovery from aqueous solutions containing various cations (Li+, Na+, K+, Ca2+, and Mg2+) was tested using a modified membrane capacitive deionization system consisting of a lithium manganese oxide electrode for lithium ion capturing and a carbon electrode for anion capturing. The effect of cations and their concentrations on lithium ion selectivity was investigated. The results showed that the selectivity order found in the collected solutions was Li+ Mg2+ > Ca2+ > K+ > Na+. This order indicates that the ionic radius and oxidation state affect the selectivity. Approximately 0.35 mu mol/g(-adsorbent) of lithium was recovered, which is 7 times higher than that from the physisorption process under the same experimental conditions. The required energy in the recovery process was calculated as 23.3 Wh/g of lithium. The results were reproducible, and no manganese dissolution was observed during 5 consecutive recovery cycles. 
Lithium recovery; Lithium manganese oxide; Electrosorption; Electrodesorption; Membrane capacitive deionization (MCDI)