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

Masamichi Tsuji, Sridhar Komarneni

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41 Scopus citations

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.

Original languageEnglish (US)
Pages (from-to)611-616
Number of pages6
JournalJournal of Materials Research
Volume8
Issue number3
DOIs
StatePublished - Mar 1993

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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