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Research Article

Effect of pH on the Photocatalytic Removal of Silver Ions by β-MnO2 particles

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  • Received: 18 November 2019Revised: 7 April 2020Accepted: 9 April 2020Available online: 12 April 2020
  • The presence of silver ions (Ag (I)) in wastewater has detrimental effect to living organism. Removal of these soluble silver is a challenging issue, particularly if it is in low concentration. This paper presents the use of β-MnO2 particles as photocatalyst to remove Ag (I) ions selectively from the aqueous solution at various pH. ICP-MS, XRD, FESEM, TEM and XPS were used to determine the removal efficiency and to characterize the deposition of silver onto the surface of β-MnO2 particles. The optimum pH for the removal of Ag (I) ions was found to be at pH 4 with 99 % of removal efficiency under one hour of visible light irradiation. This could be explained from the perspective of electrostatic attraction between β-MnO2 particles and Ag (I) ions as well as the suppression of electron-hole recombination in the presence of H%2B ions.
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Effect of pH on the Photocatalytic Removal of Silver Ions by β-MnO2 particles

  • Corresponding author:

    Swee-Yong Pung    E-mail: sypung@usm.my

  • School of Materials and Mineral Resources Engineering, Engineering Campus, Universiti Sains Malaysia, 14300 Nibong Tebal, Pulau Pinang, Malaysia

Abstract: The presence of silver ions (Ag (I)) in wastewater has detrimental effect to living organism. Removal of these soluble silver is a challenging issue, particularly if it is in low concentration. This paper presents the use of β-MnO2 particles as photocatalyst to remove Ag (I) ions selectively from the aqueous solution at various pH. ICP-MS, XRD, FESEM, TEM and XPS were used to determine the removal efficiency and to characterize the deposition of silver onto the surface of β-MnO2 particles. The optimum pH for the removal of Ag (I) ions was found to be at pH 4 with 99 % of removal efficiency under one hour of visible light irradiation. This could be explained from the perspective of electrostatic attraction between β-MnO2 particles and Ag (I) ions as well as the suppression of electron-hole recombination in the presence of H%2B ions.

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