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Dissolution kinetics of colloidal manganese dioxide in aqueous hydrochloric acid at 298 K

  • Colloid Chemistry and Electrochemistry
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Abstract

The dissolution kinetics of colloidal MnO2 in aqueous hydrochloric acid is studied at 298 K by spectrophotometric methods. The decay profile of MnO2 monitored by measuring absorbance due to MnO2 at 390 nm was exponential. As the hydrochloric acid concentration was increased from 1.26 to 5.03 M, the dissolution rate of MnO2 to Mn(II) species decreased. The reaction followed fractional order kinetics with respect both to MnO2 and HCl concentrations. The average oxidation state approached a value of +2 indicating that HCl reduced Mn-species to Mn(II) species. Mechanism based on the observed kinetics has been proposed and discussed.

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Authors and Affiliations

  1. Department of Arts and Sciences, Faculty of Engineering, Ahsanullah University of Science and Technology (AUST), Tejgaon I/A, Dhaka, 1208, Bangladesh

    Md. Aminul Islam

  2. University Grants Commission of Bangladesh, Agargaon, Dhaka, 1207, Bangladesh

    M. Muhibur Rahman

Authors
  1. Md. Aminul Islam
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  2. M. Muhibur Rahman
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Correspondence to Md. Aminul Islam.

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Islam, M.A., Rahman, M.M. Dissolution kinetics of colloidal manganese dioxide in aqueous hydrochloric acid at 298 K. Russ. J. Phys. Chem. 89, 706–709 (2015). https://doi.org/10.1134/S0036024415040172

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  • DOI: https://doi.org/10.1134/S0036024415040172

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