Sulfonated pentablock copolymer membranes and graphene oxide addition for efficient removal of metal ions from water

Simona Filice , Marta Mazurkiewicz-Pawlicka , Artur Małolepszy , Leszek Stobiński , Ryszard Kwiatkowski , Anna Boczkowska , Leon Gradoń , Silvia Scalese

Abstract

Nowadays heavy metals are among the higher environmental priority pollutants, therefore, the identification of new, effective, reusable and easy-to-handle adsorbent materials able to remove metal ions from water is highly desired. To this aim, in this work for the first time, sulfonated pentablock copolymer (s-PBC, Nexar™) membranes and s-PBC/graphene oxide (GO) nanocomposite membranes were investigated for the removal of heavy metals from water. Membranes were prepared by drop casting and their chemical, structural and morphological properties were characterized using scanning electron microscopy (SEM), Fourier transform infrared (FT-IR) spectroscopy, dynamic mechanical analysis (DMA) and small-angle X-ray scattering (SAXS). The adsorption abilities and adsorption kinetics of both the polymer and the s-PBC/GO nanocomposite were investigated for the removal of different heavy metal ions (Ni2+, Co2+, Cr3+ and Pb2+) from aqueous solutions containing the corresponding metal salts at different concentrations. The investigated s-PBC membrane shows a good efficiency, due to the presence of sulfonic groups that play a fundamental role in the adsorption process of metal ions. Its performance is further enhanced by embedding a very low amount of GO in the polymer allowing an increase by at least three times of the adsorption efficiencies of the polymer itself. This can be ascribed to the higher porosity, higher roughness and higher lamellar distances introduced by GO in the s-PBC membrane, as evidenced by the SEM and SAXS analysis. Both the polymeric materials showed the best performance in removing Pb2+ ions.

Author Simona Filice - [Consiglio Nazionale delle Ricerche]
Simona Filice,,
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, Marta Mazurkiewicz-Pawlicka (FCPE / DSP)
Marta Mazurkiewicz-Pawlicka,,
- Department of Separation Processes
, Artur Małolepszy (FCPE / DSP)
Artur Małolepszy,,
- Department of Separation Processes
, Leszek Stobiński (FCPE / GL)
Leszek Stobiński,,
- WUT Grafen Laboratory
, Ryszard Kwiatkowski - National Center for Nuclear Research (NCBJ) [University of Bielsko-Biala]
Ryszard Kwiatkowski,,
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, Anna Boczkowska (FMSE / DSMP)
Anna Boczkowska,,
- Division of Ceramic Materials and Polymers
, Leon Gradoń (FCPE / CIPE)
Leon Gradoń,,
- Chair of Integrated Process Engineering
, Silvia Scalese - [Consiglio Nazionale delle Ricerche]
Silvia Scalese,,
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Journal seriesNanomaterials, ISSN 2079-4991
Issue year2020
Vol10
No6
Pages1-19
Publication size in sheets0.9
Article number1157
Keywords in Englishgraphene oxide, sulfonated pentablock copolymer, metal ions, adsorption, water purification
DOIDOI:10.3390/nano10061157
URL https://www.mdpi.com/2079-4991/10/6/1157/htm
Languageen angielski
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Filice S. (i in.) - Sulfonated pentablock copolymer...pdf 5.15 MB
Score (nominal)70
Score sourcejournalList
ScoreMinisterial score = 70.0, 16-09-2020, ArticleFromJournal
Publication indicators Scopus Citations = 0; WoS Impact Factor: 2018 = 4.034 (2) - 2018=4.358 (5)
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