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

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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.

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Authors and Affiliations

  1. Department of Chemistry, Faculty of Science, Tokyo Institute of Technology, 2-12-1, O-okayama, Meguro-ku, Tokyo 152, Japan

    Masamichi Tsuji

  2. Materials Research Laboratory and Department of Agronomy, The Pennsylvania State University, 16802-4801, University Park, Pennsylvania, USA

    Sridhar Komarneni

Authors
  1. Masamichi Tsuji
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  2. Sridhar Komarneni
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Tsuji, M., Komarneni, S. Selective exchange of divalent transition metal ions in cryptomelane-type manganic acid with tunnel structure. Journal of Materials Research 8, 611–616 (1993). https://doi.org/10.1557/JMR.1993.0611

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  • DOI: https://doi.org/10.1557/JMR.1993.0611

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