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Increased Efficiency of Electroflotational Extraction of Lead(II) Ions from Water Solutions in the Presence of Ions of Aluminum(III) and Iron(III) as Coagulants

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Abstract

This article studies the effects of solubility, disperse features (average diameter dav and charge (ζ‑potential)) of the particles of heavy-metal slightly soluble compounds exemplified by aluminum(III), iron(III), zinc(II), and lead(II) hydrates related to the efficiency of their removal from aqueous solutions in the composition by electroflotation and filtration within the pH range 5–12. The efficiency of the electroflotation-based Pb(II) removal from aqueous solutions is determined by the sorption of ions and the dispersed Pb(II) phase on the Al(III) and Zn(II) dispersed phase. The size of the disperse phase of multicomponent systems is averaged compared to that of individual compounds. The maximum particle size of the dispersed phase of multicomponent systems comprising Al(III)–Zn(II)–Pb(II) at a pH of 8.0 reaches 36 μm, in the Fe(III)–Zn(II)–Pb(II) and this parameter reaches 46 μm at a pH of 9.0. The ζ-potential of the dispersed phase of the studied systems varies in the range from –2 to –9 mV for all the systems within the pH range 7–9. The research showed that the efficiency of the removal of lead(II) and accompanying metals compounds from wastewater through electroflotation reaches 95–97% within the pH range 8–9. Filtration of the solutions allows us to improve the removal to 99% and higher.

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Funding

This study was supported by the Ministry of Education and Science of the Russian Federation as part of agreement no. 14.574.21.0169 on the provision of subsidies, dated September 26, 2017, with the unique work (project) identifier RFMEFI57417X0169.

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Authors and Affiliations

  1. Department of Technology of Inorganic Substances and Electrochemical Processes, Mendeleyev University of Chemical Technology, Moscow, Russia

    Yu. O. Malkova, V. A. Brodskiy & V. A. Kolesnikov

Authors
  1. Yu. O. Malkova
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  2. V. A. Brodskiy
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  3. V. A. Kolesnikov
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Correspondence to Yu. O. Malkova.

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The authors declare that they have no conflict of interest.

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Translated by K. Gumerov

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Malkova, Y.O., Brodskiy, V.A. & Kolesnikov, V.A. Increased Efficiency of Electroflotational Extraction of Lead(II) Ions from Water Solutions in the Presence of Ions of Aluminum(III) and Iron(III) as Coagulants. Moscow Univ. Chem. Bull. 75, 135–141 (2020). https://doi.org/10.3103/S002713142002008X

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  • DOI: https://doi.org/10.3103/S002713142002008X

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