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- W2039236496 abstract "A new type of ion-sieve manganese oxide (HMnO(2Mg)) was prepared by extracting magnesium from Mg2MnO4 with aqueous acid. The preparation conditions of HMnO(2Mg) and its ion-exchange properties were examined. The extraction of magnesium from Mg2MnO4 caused a decrease in the lattice constant of a spinel structure. The HMnO(2Mg) showed a selective adsorption of lithium from seawater when the Mg/Mn ratio of the sample was less than 1. The pH titration curve showed an affinity order of Cs ≒ K < Li above pH 3.5. The lithium-ion uptake increased with increasing solution pH and reached 3 meq/g at pH 12. The selectivity sequence was Na < Li < K < Rb < Cs for alkali metal ions at pH 3.1, while it changed to Na < Rb ≒ Cs < K < Li at pH 8. The selectivity sequences were Mg < Ca < Sr < Ba for alkaline earth metal ions and Ni < Zn < Cu < Co for transition metal ions at pH 3.1. The Li+-selective property is discussed based on the ion-sieve effect of the protonated octahedral sites at the cubic closed-packed oxygen framework of HMnO(2Mg)." @default.
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- W2039236496 date "1989-07-01" @default.
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- W2039236496 title "Preparation and ion-exchange properties of ion-sieve manganese oxide based on Mg2MnO4" @default.
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- W2039236496 doi "https://doi.org/10.1016/0021-9797(89)90129-x" @default.
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