Abstract
Abstract Extraction of lithium ions from LiMn2O4 by ammonium peroxodisulfate ((NH4)2S2O8) was studied, and properties of adsorbents thus obtained (MnO2(Li)) were examined with a special focus on their ability to separate the lithium isotopes. Under well-controlled conditions, (NH4)2S2O8 was an excellent lithium ion extractant, with satisfactorily high degrees of lithium extraction while maintaining minimal dissolution of manganese. The maximum value of the 7Li/6Li isotopic separation factor with MnO2(Li) thus prepared was 1.014 at 25°C, which was several times larger than those of commercially available organic ion-exchangers.
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