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Journal of Electronic Materials

, Volume 46, Issue 6, pp 3681–3688 | Cite as

Comparison of the Adsorption of Fe(III) on Alpha- and Gamma-MnO2 Nanostructure

  • Van-Phuc DinhEmail author
  • Ngoc-Chung Le
  • Thi-Diem Le
  • Tan-Anh Bui
  • Ngoc-Tuan Nguyen
Article

Abstract

Aqueous industrial wastes from heavy industry factories contain a large amount of Fe ions, which constitute a hazard for human life even at trace concentrations. Adsorption technology is a promising method for removing Fe(III) from aqueous solutions. In this report, the adsorption of the Fe(III) ion on γ- and α-MnO2 nanostructures was compared. The results showed that the maximum adsorption was obtained at pH = 3.5 for both materials after 120 min for γ-MnO2 and 80 min for α-MnO2. Adsorption isotherm models, such as Langmuir, Freundlich, Sips, Tempkin, and Dubinin–Radushkevich were applied to determine adsorption capacity as well as the nature of the uptake. The highest R 2, the smallest of root mean squared error (RMSE), and the nonlinear Chi-square test (χ2) values determined that the Sips model was the most appropriate equation to describe the adsorption of Fe(III) on γ- and α-MnO2. The maximum monolayer adsorption capacity calculated from the Langmuir model and the maximum adsorption capacity calculated from the Sips model of γ-MnO2 was more than four times that of α-MnO2. The heat of the adsorption as well as the mean free energy estimated from Tempkin and Dubinin–Radushkevich was determined to be less than 8 kJ/mol, which showed that the adsorption on both materials followed a physical process. Kinetic studies showed that a pseudo-second-order model was accurately described on both samples with three stages.

Keywords

γ-MnO2 α-MnO2 adsorption Fe(III) kinetics 

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Copyright information

© The Minerals, Metals & Materials Society 2017

Authors and Affiliations

  • Van-Phuc Dinh
    • 1
    Email author
  • Ngoc-Chung Le
    • 2
  • Thi-Diem Le
    • 1
  • Tan-Anh Bui
    • 1
  • Ngoc-Tuan Nguyen
    • 3
  1. 1.Dong Nai UniversityBien Hoa CityVietnam
  2. 2.Dalat UniversityDalat CityVietnam
  3. 3.Nuclear Research InstituteDalatVietnam

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