Synthesis and Adsorption Properties of Li1.6Mn1.6O4 by a Combination of Redox Precipitation and Solid-Phase Reaction

Orthorhombic LiMnO2 (o-LiMnO2), spinel Li1.6Mn1.6O4 precusors, and spinel H1.6Mn1.6O4 ion sieves were synthesized by a combination of controlled redox precipitation and solid-phase reaction. o-LiMnO2 was synthesized by a controlled redox precipitation using Mn­(OH)2, LiOH, and (NH4)2S2O8. Spinel Li1...

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Published inIndustrial & engineering chemistry research Vol. 53; no. 40; pp. 15517 - 15521
Main Authors Sun, Shu-Ying, Xiao, Jia-Li, Wang, Jin, Song, Xingfu, Yu, Jian-Guo
Format Journal Article
LanguageEnglish
Published American Chemical Society 08.10.2014
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Summary:Orthorhombic LiMnO2 (o-LiMnO2), spinel Li1.6Mn1.6O4 precusors, and spinel H1.6Mn1.6O4 ion sieves were synthesized by a combination of controlled redox precipitation and solid-phase reaction. o-LiMnO2 was synthesized by a controlled redox precipitation using Mn­(OH)2, LiOH, and (NH4)2S2O8. Spinel Li1.6Mn1.6O4 precursor was prepared by the heat treatment of o-LiMnO2. Further, an ion sieve (H1.6Mn1.6O4) was synthesized by the acid (HCl) treatment of Li1.6Mn1.6O4. The effect of redox precipitation and solid-phase reaction on the structure and ion-exchange property of the ion sieve was examined by powder X-ray diffraction, scanning electron microscopy, and Li+-selective adsorption measurements. The results showed that the ion sieve exhibited highly selective adsorption capacity for Li+ (3.88 mmol·g–1) from Qarhan salt lake brine, which was significant for the Li+ extraction from low-grade brine.
ISSN:0888-5885
1520-5045
DOI:10.1021/ie5004625