Synthesis and ion exchange properties of manganese(IV) dioxide doped by 3+transition metal cations

被引：4
作者：
Bartos, B [1 ]
Bilewicz, A [1 ]
机构：
[1] Inst Nucl Chem & Technol, Dept Radiochem, PL-03195 Warsaw, Poland
来源：
SOLVENT EXTRACTION AND ION EXCHANGE | 2001年 / 19卷 / 03期
关键词：
D O I：
10.1081/SEI-100103285
中图分类号：
O6 [化学];
学科分类号：
0703 ;
摘要：
The samples of mixed Mn-M oxides (M-transition metal) were synthesized by redox reaction of KMnO4 and MnSO4 in the presence of Co2+ and Fe2+ cations. Co3+ and Fe3+ ions, having similar ionic radii to Mn3+, were incorporated into MnO2 structure and were not removed even by concentrated HNO3 solution. Mixed oxides exhibit higher affinity for heavy alkaline earth ions (Ba2+ and Ra2+) than alpha -MnO2 and lower selectivity for alkali metal cations. The separation factor for Ra-Ba pair on mixed oxides is much higher than on alpha -MnO2 and cation exchange resins. The obtained alpha -MnO2 samples can be used for the determination of Ra-226,Ra-228 in natural water containing significant amounts of potassium and barium salts.
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页码：553 / 564
页数：12
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