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Assessment of heat-inactivated marine Aspergillus flavus as a novel biosorbent for removal of Cd(II), Hg(II), and Pb(II) from water

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Abstract

A novel marine fungus was isolated and classified as Aspergillus flavus strain EGY11. The heat-inactivated form of isolated Aspergillus flavus was investigated and evaluated as a new eco-friendly and highly efficient biosorbent for removal of toxic heavy metals such as Cd(II), Hg(II), and Pb(II) from aqueous solutions. The SEM morphological studies of biosorbent-loaded metal ions confirmed their direct binding on the surface of heat-inactivated Aspergillus flavus. The metal biosorption capacity values were determined and optimized by the batch technique in the presence of various experimental controlling factors such as pH, contact time, biosorbent dosage, initial metal ion concentration, and coexisting species. The maximum metal capacity values of Cd(II), Hg(II), and Pb(II) were cauterized as 1550 (pH 7.0), 950 (pH 7.0), and 1000 μmol g−1 (pH 6.0), respectively. The equilibrium time for removal of metal ions was identified as 40 min. The maximum sorption capacity values (1200.0–4000.0 μmol g−1) were established by 5.0 mg as the optimum mass of biosorbent. The collected biosorption data obtained from the equilibrium studies using the initial metal ion concentration were described by the Langmuir, Freundlich, Brunauer–Emmett–Teller (BET), and Dubinin–Radushkevich isotherm (D–R) isotherm models. The potential implementation of heat-inactivated Aspergillus flavus biosorbent for heavy metal removal from different water samples was successfully accomplished using multistage microcolumn technique. The results refer to excellent percentage recovery values in the ranges 92.7–99.0, 91.3–95.6, and 95.3–98.2% for the biosorptive removal of Cd(II), Hg(II), and Pb(II), respectively, from the examined environmental samples.

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Authors and Affiliations

  1. Faculty of Sciences, Chemistry Department, Alexandria University, P.O. Box 426, Alexandria, 21321, Egypt

    Mohamed E. Mahmoud

  2. National Institute of Oceanography and Fisheries (NIOF), Marine Chemistry Lab, Alexandria, Egypt

    Gehan M. El Zokm

  3. National Institute of Oceanography and Fisheries (NIOF), Marine Biotechnology Lab, Alexandria, Egypt

    Aida E.M. Farag

  4. Faculty of Sciences, Chemistry Department, Ain Shams University, P.O. Box, Cairo, Egypt

    Mohamed S. Abdelwahab

Authors
  1. Mohamed E. Mahmoud
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  2. Gehan M. El Zokm
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  3. Aida E.M. Farag
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  4. Mohamed S. Abdelwahab
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Correspondence to Mohamed E. Mahmoud.

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Responsible editor: Guilherme L. Dotto

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Mahmoud, M.E., El Zokm, G.M., Farag, A.E. et al. Assessment of heat-inactivated marine Aspergillus flavus as a novel biosorbent for removal of Cd(II), Hg(II), and Pb(II) from water. Environ Sci Pollut Res 24, 18218–18228 (2017). https://doi.org/10.1007/s11356-017-9323-8

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  • DOI: https://doi.org/10.1007/s11356-017-9323-8

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