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Research article - Peer-reviewed, 2018

Protection of Thiol Groups on the Surface of Magnetic Adsorbents and Their Application for Wastewater Treatment

Melnyk, Inna V.; Pogorilyi, Roman P.; Zub, Yuriy L.; Vaclavikova, Miroslava; Gdula, Karolina; Dabrowski, Andrzej; Seisenbaeva, Gulaim A.; Kessler, Vadim G.

Abstract

The magnetite nanoparticles were functionalized with silica shells bearing mercaptopropyl (monofunctional) and mercaptopropyl-and-alkyl groups (bifunctional) by single-step sol-gel technique. The influence of synthetic conditions leading to increased amounts of active functional groups on the surface and improved capacity in the uptake of Ag(I), Cd(II), Hg(II), and Pb(II) cations was revealed. The physicochemical properties of obtained magnetic nanocomposites were investigated by FTIR, Raman, XRD,TEM, SEM, low-temperature nitrogen ad-/desorption measurements, TGA, and chemical microanalysis highlighting the efficiency of functionalization and mechanisms of the preparation procedures. The removal of the main group of heavy metal cations was studied in dependence from the pH, contact time and equilibrium concentration to analyze the complexes composition for the large scale production of improved adsorbents. It was demonstrated that introduction of the alkyl groups into the surface layer prevents the formation of the disulfide bonds between adjacent thiol groups. The obtained adsorbents were employed to treat real wastewater from Ruskov, Slovakia with concentration of Fe 319 ng/cm(3), Cu 23.7 ng/cm(3), Zn 36 ng/cm(3), Mn 503 ng/cm(3), Al 21 ng/cm(3), As 34 ng/cm(3), Pb 5.8 ng/ cm(3), Ni 35 ng/cm(3), Co 4.2 ng/cm(3), Cr 9.4ng/cm(3), Sb 6 ng/cm(3), Cd 5 ng/cm(3). These materials proved to be highly effective in the removal of 50% of all metal ions, especially Zn,Cd, and Pb ions from it and turned recyclable, opening for their sustainable use in water purification.

Published in

Scientific Reports
2018, Volume: 8, article number: 8592
Publisher: NATURE PUBLISHING GROUP

        SLU Authors

      • Seisenbaeva, Gulaim

        • The Department of Chemistry and Biotechnology, Swedish University of Agricultural Sciences
        • Kessler, Vadim

          • The Department of Chemistry and Biotechnology, Swedish University of Agricultural Sciences

        Sustainable Development Goals

        SDG6 Clean water and sanitation
        SDG12 Responsible consumption and production

        UKÄ Subject classification

        Water Treatment

        Publication identifier

        DOI: https://doi.org/10.1038/s41598-018-26767-w

        Permanent link to this page (URI)

        https://res.slu.se/id/publ/95786