ION-EXCHANGE SELECTIVITY FOR ALKALI METAL IONS ON A CRYPTOMELANE-TYPE HYDROUS MANGANESE DIOXIDE
作者:
Masamichi Tsuji,
Sridhar Komarneni,
Mitsuo Abe;,
期刊:
Solvent Extraction and Ion Exchange
(Taylor Available online 1993)
卷期:
Volume 11,
issue 1
页码: 143-158
ISSN:0736-6299
年代: 1993
DOI:10.1080/07366299308918149
出版商: Taylor & Francis Group
数据来源: Taylor
摘要:
A cryptomelane-type hydrous manganese dioxide in the H+form has been studied for its ion-exchange selectivity for Li+, Na+, K+, Rb+ and Cs+/H+ exchange at 30*C. The distribution coefficients for each alkali cation were calculated as a function of the initial concentration of exchanging cations in the presence of a constant total normality of 0.1 N. The separation factor for the Na+ - K+ pair attained 1.3 x 10" at Xx→0 This extremely high selectivity can be attributed to the rigid tunnel structure with an opening which is only accessible to less hydrated cations, those that shed their hydration shell easily and those with crystal ionic radius of approximately 1.4A.
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