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Selective exchange of divalent transition metal ions in cryptomelane-type manganic acid with tunnel structure

Published online by Cambridge University Press:  31 January 2011

Masamichi Tsuji  and
Sridhar Komarneni
Masamichi Tsuji
Affiliation:
Department of Chemistry, Faculty of Science, Tokyo Institute of Technology, 2-12-1, O-okayama, Meguro-ku, Tokyo 152, Japan
Sridhar Komarneni
Affiliation:
Materials Research Laboratory and Department of Agronomy, The Pennsylvania State University, University Park, Pennsylvania 16802-4801
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Abstract

The ion-exchange selectivity of divalent transition metal ions on cryptomelane-type manganic acid (CMA) with tunnel structure has been studied using the distribution coefficients (Kd) at a small fractional exchange in nitrate media. All metal ions studied showed linear relationships with a slope of −2 on the log-log plot of Kd vs [HNO3] which clearly indicated that the adsorption process is an “ideal” ion-exchange. The selectivity increased in the following order: Pb ≫ Mn > Co > Cu > Hg > Cd > Zn > Ni. The high selectivity of the manganic acid was successfully utilized in the removal of Co2+ from seawater and tap water.

Type
Articles
Information
Journal of Materials Research , Volume 8 , Issue 3 , March 1993 , pp. 611 - 616
Copyright
Copyright © Materials Research Society 1993

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