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Investigation of Removal of Cu(II) Ions by Commercial Activated Carbon: Equilibrium and Thermodynamic Studies

Protection of Metals and Physical Chemistry of Surfaces volume 55, pages 28–33 (2019)Cite this article

Abstract

The present study deals with the application of activated carbon for the adsorptive removal of Cu(II) from its aqueous solutions. This paper incorporates the effects of pH, adsorbent dose, contact time, concentration and temperature. Equilibrium adsorption isotherms are usually used to determine the capacity of an adsorbent. The adsorption behavior of the Cu(II) has been studied using Langmuir and Freundlich adsorption isotherm models. The monolayer adsorption capacity determined from the Langmuir adsorption equation has been found as 13.7 mg g–1. Adsorption of Cu(II) on adsorbent was found to increase on decreasing initial concentration, increasing pH up to 7 and increasing temperature. The paper discusses the thermodynamic parameters of the adsorption (the Gibbs free energy, entropy and enthalpy). Our results demonstrate that the adsorption process was spontaneous and endothermic under natural conditions. SPSS software was employed for prediction and investigation of factor importance in determining of reminded Cu(II) after adsorption. According to Beta-value the importance order of factors is: concentration, adsorbent dose, time, pH and temperature respectively. Also, the obtained results from this study show the good adaptation between experimental and prediction values of % Cu(II).

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ACKNOWLEDGMENTS

The authors thank the Golestan University for providing financial support of the work described in this paper.

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Authors and Affiliations

  1. Department of Chemistry, Faculty of Sciences, Golestan University, Gorgan, Iran

    Elaheh Safaei, Narges Samadani Langeroodi & Elham Baher

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  1. Elaheh Safaei
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  2. Narges Samadani Langeroodi
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  3. Elham Baher
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Correspondence to Narges Samadani Langeroodi.

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Elaheh Safaei, Langeroodi, N.S. & Baher, E. Investigation of Removal of Cu(II) Ions by Commercial Activated Carbon: Equilibrium and Thermodynamic Studies. Prot Met Phys Chem Surf 55, 28–33 (2019). https://doi.org/10.1134/S2070205119010180

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  • DOI: https://doi.org/10.1134/S2070205119010180

Keywords:

  • adsorption
  • heavy metals
  • activated carbon
  • thermodynamics
  • statistical analysis