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Cobalt and zinc removal from aqueous solution by chemically treated bentonite

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Abstract

Natural bentonite was treated by hydrochloric, nitric, and phosphoric acids followed by washing with sodium hydroxide in order to enhance its adsorption capacity. The sample that treated with hydrochloric acid followed by further treatment with NaOH showed the highest cation exchange capacity with a value of 51.20 meq/100 g. The zero-point of charge for this sample was found to be 4.50. Adsorption isotherms for both cobalt and zinc were fitted using Langmuir, Freundlich, and Redlich-Peterson and showed an adsorption capacity of 138.1 mg Co2+ and 202.6 mg Zn2+ per gram of treated sample.

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Authors and Affiliations

  1. Department of Chemical Engineering, Mutah University, Al Karak, 61710, Jordan

    Reyad A. Shawabkeh

  2. Department of Environmental Engineering, Al-Hussein Bin Talal University, Ma’an, Jordan

    Omar A. Al-Khashman

  3. Department of Chemistry, Mutah University, Al Karak, 61710, Jordan

    Hamzeh S. Al-Omari

  4. Department of Basic Sciences, Al-Balqa Applied University, Amman, Jordan

    Ali F. Shawabkeh

Authors
  1. Reyad A. Shawabkeh
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  2. Omar A. Al-Khashman
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  3. Hamzeh S. Al-Omari
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  4. Ali F. Shawabkeh
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Correspondence to Reyad A. Shawabkeh.

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Shawabkeh, R.A., Al-Khashman, O.A., Al-Omari, H.S. et al. Cobalt and zinc removal from aqueous solution by chemically treated bentonite. Environmentalist 27, 357–363 (2007). https://doi.org/10.1007/s10669-007-9048-1

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  • DOI: https://doi.org/10.1007/s10669-007-9048-1

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