American Journal of Physical Chemistry

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Adsorption of Cu2+ and Cr6+ in Aqueous Solution by a Thermally Modified Biosorbent Based on Cotton Cakes

Received: Sep. 27, 2019    Accepted: Oct. 28, 2019    Published: Nov. 19, 2019
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Abstract

This work focuses on the retention capacity of Cu2+ and Cr6+ ions in water by adsorption on a thermally modified biosorbent based on cotton cakes. The solutions treated are synthetic copper nitrate solutions rich in Cu2+ ions and potassium dichromate rich in Cr6+ ions in distilled water. The adsorption tests were carried out by mixing, with stirring (250 rpm), 0.02 g of the adsorbent for the solution containing the Cu2+ ions and 0.04 g for that containing the Cr6+ ions with a volume of 50 mL of these solutions. Kinetic studies have shown that the maximum adsorption is obtained after 20 minutes. In addition, the pH of the medium influences the adsorption process and the yield is improved with increasing pH. Amounts of copper and chromium adsorbed increase with increasing initial concentrations of these ions up to 40 mg/L. Similarly, adsorbed amounts increase with increasing mass of the adsorbent. On the other hand, these adsorbed quantities decrease with increasing temperature. The best adopted kinetic models are pseudo-second-order, Intraparticular and Evlovich. The adsorption isotherms conform to the Langmuir and Dubinin-Redushkovic models. The values of thermodynamic parameters such as free enthalpy (ΔH° KJ/K.mol), entropy (ΔS° KJ/K.mol) and isosteric adsorption heat (ΔG° KJ/K. mol) at temperatures of 293; 303; 313 and 323K, all negative, show that we have to do with an exothermic adsorption, physical, ordered and spontaneous. The electrostatic attraction between the Cu2+ and Cr6+ ions and the adsorbent for the pH values above the pH of the point of zero charges shows that we have to do with a chemical adsorption.

DOI 10.11648/j.ajpc.20190804.11
Published in American Journal of Physical Chemistry ( Volume 8, Issue 4, December 2019 )
Page(s) 66-74
Creative Commons

This is an Open Access article, distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution and reproduction in any medium or format, provided the original work is properly cited.

Copyright

Copyright © The Author(s), 2024. Published by Science Publishing Group

Keywords

Adsorption Isotherms, Cotton Cakes, Copper (II), Chromium (VI), Thermodynamic Parameters

References
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[5] Bendaho Djelloul, Ainadtabet Driss, Bassou Djillali. (2014). Adsorption of Cu (II) copper in solution by raw and activated clay from the Tiut-Naama region of southwestern Algeria. Journal of Materials Science. No. 02. pp. 23-34.
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  • APA Style

    Abia Daouda, Yowe Kidwe, Domga Richard, Domga, Harouna Massai. (2019). Adsorption of Cu2+ and Cr6+ in Aqueous Solution by a Thermally Modified Biosorbent Based on Cotton Cakes. American Journal of Physical Chemistry, 8(4), 66-74. https://doi.org/10.11648/j.ajpc.20190804.11

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    ACS Style

    Abia Daouda; Yowe Kidwe; Domga Richard; Domga; Harouna Massai. Adsorption of Cu2+ and Cr6+ in Aqueous Solution by a Thermally Modified Biosorbent Based on Cotton Cakes. Am. J. Phys. Chem. 2019, 8(4), 66-74. doi: 10.11648/j.ajpc.20190804.11

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    AMA Style

    Abia Daouda, Yowe Kidwe, Domga Richard, Domga, Harouna Massai. Adsorption of Cu2+ and Cr6+ in Aqueous Solution by a Thermally Modified Biosorbent Based on Cotton Cakes. Am J Phys Chem. 2019;8(4):66-74. doi: 10.11648/j.ajpc.20190804.11

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  • @article{10.11648/j.ajpc.20190804.11,
      author = {Abia Daouda and Yowe Kidwe and Domga Richard and Domga and Harouna Massai},
      title = {Adsorption of Cu2+ and Cr6+ in Aqueous Solution by a Thermally Modified Biosorbent Based on Cotton Cakes},
      journal = {American Journal of Physical Chemistry},
      volume = {8},
      number = {4},
      pages = {66-74},
      doi = {10.11648/j.ajpc.20190804.11},
      url = {https://doi.org/10.11648/j.ajpc.20190804.11},
      eprint = {https://download.sciencepg.com/pdf/10.11648.j.ajpc.20190804.11},
      abstract = {This work focuses on the retention capacity of Cu2+ and Cr6+ ions in water by adsorption on a thermally modified biosorbent based on cotton cakes. The solutions treated are synthetic copper nitrate solutions rich in Cu2+ ions and potassium dichromate rich in Cr6+ ions in distilled water. The adsorption tests were carried out by mixing, with stirring (250 rpm), 0.02 g of the adsorbent for the solution containing the Cu2+ ions and 0.04 g for that containing the Cr6+ ions with a volume of 50 mL of these solutions. Kinetic studies have shown that the maximum adsorption is obtained after 20 minutes. In addition, the pH of the medium influences the adsorption process and the yield is improved with increasing pH. Amounts of copper and chromium adsorbed increase with increasing initial concentrations of these ions up to 40 mg/L. Similarly, adsorbed amounts increase with increasing mass of the adsorbent. On the other hand, these adsorbed quantities decrease with increasing temperature. The best adopted kinetic models are pseudo-second-order, Intraparticular and Evlovich. The adsorption isotherms conform to the Langmuir and Dubinin-Redushkovic models. The values of thermodynamic parameters such as free enthalpy (ΔH° KJ/K.mol), entropy (ΔS° KJ/K.mol) and isosteric adsorption heat (ΔG° KJ/K. mol) at temperatures of 293; 303; 313 and 323K, all negative, show that we have to do with an exothermic adsorption, physical, ordered and spontaneous. The electrostatic attraction between the Cu2+ and Cr6+ ions and the adsorbent for the pH values above the pH of the point of zero charges shows that we have to do with a chemical adsorption.},
     year = {2019}
    }
    

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  • TY  - JOUR
    T1  - Adsorption of Cu2+ and Cr6+ in Aqueous Solution by a Thermally Modified Biosorbent Based on Cotton Cakes
    AU  - Abia Daouda
    AU  - Yowe Kidwe
    AU  - Domga Richard
    AU  - Domga
    AU  - Harouna Massai
    Y1  - 2019/11/19
    PY  - 2019
    N1  - https://doi.org/10.11648/j.ajpc.20190804.11
    DO  - 10.11648/j.ajpc.20190804.11
    T2  - American Journal of Physical Chemistry
    JF  - American Journal of Physical Chemistry
    JO  - American Journal of Physical Chemistry
    SP  - 66
    EP  - 74
    PB  - Science Publishing Group
    SN  - 2327-2449
    UR  - https://doi.org/10.11648/j.ajpc.20190804.11
    AB  - This work focuses on the retention capacity of Cu2+ and Cr6+ ions in water by adsorption on a thermally modified biosorbent based on cotton cakes. The solutions treated are synthetic copper nitrate solutions rich in Cu2+ ions and potassium dichromate rich in Cr6+ ions in distilled water. The adsorption tests were carried out by mixing, with stirring (250 rpm), 0.02 g of the adsorbent for the solution containing the Cu2+ ions and 0.04 g for that containing the Cr6+ ions with a volume of 50 mL of these solutions. Kinetic studies have shown that the maximum adsorption is obtained after 20 minutes. In addition, the pH of the medium influences the adsorption process and the yield is improved with increasing pH. Amounts of copper and chromium adsorbed increase with increasing initial concentrations of these ions up to 40 mg/L. Similarly, adsorbed amounts increase with increasing mass of the adsorbent. On the other hand, these adsorbed quantities decrease with increasing temperature. The best adopted kinetic models are pseudo-second-order, Intraparticular and Evlovich. The adsorption isotherms conform to the Langmuir and Dubinin-Redushkovic models. The values of thermodynamic parameters such as free enthalpy (ΔH° KJ/K.mol), entropy (ΔS° KJ/K.mol) and isosteric adsorption heat (ΔG° KJ/K. mol) at temperatures of 293; 303; 313 and 323K, all negative, show that we have to do with an exothermic adsorption, physical, ordered and spontaneous. The electrostatic attraction between the Cu2+ and Cr6+ ions and the adsorbent for the pH values above the pH of the point of zero charges shows that we have to do with a chemical adsorption.
    VL  - 8
    IS  - 4
    ER  - 

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Author Information
  • Department of Chemistry, Faculty of Science, University of Ngaoundere, Cameroon

  • Department of Chemistry, Faculty of Science, University of Ngaoundere, Cameroon

  • Department of Applied Chemistry, ENSAI, University of Ngaoundere, Cameroon

  • Department of Applied Chemistry, ENSAI, University of Ngaoundere, Cameroon

  • Department of Chemistry, Faculty of Science, University of Ngaoundere, Cameroon

  • Section