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Enhanced sequestration of Cr(VI) onto plant extract anchored on carbon-coated aluminium oxide composite

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Abstract

Aluminium oxide (ALU) and carbon-coated aluminium oxide modified with Kigelia africana leaf extract (KECA) were employed for the removal of toxic hexavalent chromium (Cr(VI)) from the aqueous phase. The adsorbents (ALU and KECA) were characterized by TGA, BET, FESEM, FTIR, Raman and XRD spectroscopic techniques. The potential of KECA and ALU to remove Cr(VI) from simulated wastewater was optimum at pH 2, sorbent dose of 0.025 g and a contact time of 200 min. Meanwhile, the uptake capacity of KECA and ALU was enhanced with an increase in sorbent dose, contact time and initial Cr(VI) concentration. The uptake of Cr(VI) onto the adsorbents ALU and KECA was kinetically best described by the pseudo-second-order and Elovich models, respectively. Besides, the equilibrium data acquired for ALU and KECA obeyed Freundlich and Langmuir isotherm models, respectively. ALU and KECA were observed to have optimum adsorption capacity of 56.45 mg g−1 and 258.2 mg g−1, respectively. The adsorption of Cr(VI) onto the adsorbents was thermodynamically feasible, endothermic in nature and entropy-driven. A decrease in efficiency was observed on regeneration of the absorbents, thus limiting their reusability. However, the presence of functional groups with reducing property in the extract of Kigelia africana leaves was noticed to enhance the capacity of the adsorbent to abstract Cr(VI) from the solution. Hence, this study demonstrates the potential of KECA to sequestrate Cr(VI) from an aqueous solution and provides a reference for its application to the treatment of Cr(VI)-laden industrial wastewater.

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Acknowledgements

The authors are grateful to Michael Okpara University of Agriculture, Umudike, Nigeria, for the support.

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This work was supported by Michael Okpara University of Agriculture, Umudike, Nigeria.

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Authors and Affiliations

  1. Department of Chemistry, Michael Okpara University of Agriculture, Umudike, Nigeria

    James Friday Amaku

  2. Chemical Sciences Department, Olabisi Onabanjo University, Ago-Iwoye, P. M. B. 2002, Nigeria

    Segun A. Ogundare

  3. Department of Chemistry, University of the Free State, Bloemfontein, South Africa

    Kovo G. Akpomie & Jeanet Conradie

  4. Department of Pure & Industrial Chemistry, University of Nigeria, Nsukka, Nigeria

    Kovo G. Akpomie

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  1. James Friday Amaku
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  2. Segun A. Ogundare
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Amaku James Friday: design and implementation. Segun A Ogundare: edited the manuscript. Kovo G Akpomie: corrected and improved the manuscript. Jeanet Conradie: supervised the manuscript.

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Amaku, J.F., Ogundare, S.A., Akpomie, K.G. et al. Enhanced sequestration of Cr(VI) onto plant extract anchored on carbon-coated aluminium oxide composite. Environ Sci Pollut Res 28, 57723–57738 (2021). https://doi.org/10.1007/s11356-021-14694-9

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