Brushite-Metakaolin Composite Geopolymer Material as an Effective Adsorbent for Lead Removal from Aqueous Solutions

Dunja Djukić, Aleksandar Krstić, Ksenija Jakovljević, Svetlana Butulija, Ljubica Andjelković, Vladimir Pavlović and Miljana Mirković
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Dunja Djukić: Faculty of Biology, University of Belgrade, Studentski Trg 16, 11000 Belgrade, Serbia
Aleksandar Krstić: Department of Physical Chemistry, “Vinča” Institute of Nuclear Sciences—National Institute of thе Republic of Serbia, University of Belgrade, 11000 Belgrade, Serbia
Ksenija Jakovljević: Faculty of Biology, University of Belgrade, Studentski Trg 16, 11000 Belgrade, Serbia
Svetlana Butulija: Department of Materials, “Vinča” Institute of Nuclear Sciences—National Institute of thе Republic of Serbia, University of Belgrade, 11000 Belgrade, Serbia
Ljubica Andjelković: Department of Chemistry, Institute of Chemistry, Technology and Metallurgy, University of Belgrade, Njegoševa 12, 11000 Belgrade, Serbia
Vladimir Pavlović: Faculty of Agriculture, University of Belgrade, Nemanjina 6, 11000 Belgrade, Serbia
Miljana Mirković: Department of Materials, “Vinča” Institute of Nuclear Sciences—National Institute of thе Republic of Serbia, University of Belgrade, 11000 Belgrade, Serbia

Sustainability, 2022, vol. 14, issue 7, 1-16

Abstract: Newly designed mesoporous brushite-metakaolin-based geopolymer materials were examined with an idea for using this material as a potential adsorbent for Pb(II) removal from aqueous solutions. As a starting component for geopolymer synthesis, a natural raw kaolinite clay with the addition of 2 wt.%, 4 wt.%, 6 wt.%, 8 wt.%, and 10 wt.% of pure brushite was used. Phase, structural, morphological, and adsorption properties of newly synthesized mesoporous brushite-metakaolin geopolymer materials were examined in detail by the means of XRPD, FTIR, SEM-EDS, BET/BJH, and ICP-OES methods. The ICP-OES results showed that the synthesized material samples with 2 wt.%, 4 wt.%, and 6 wt.% of brushite possess significant adsorption properties and the mechanisms of the adsorption process can be attributed to chemisorption. The most notable result is that brushite-metakaolin-geopolymer with 2 wt.% of brushite have the best efficiency removal, more than 85% of Pb(II).

Keywords: environmentally friendly; alkali-activated materials; high lead removal efficiency; natural adsorbents (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2022
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