Surface modification of macroporous glycidyl methacrylate based copolymers for selective sorption of heavy metals |
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Authors: | Ljiljana Malovi? Aleksandra Nastasovi? Zvjezdana Sandi? Jelena Markovi? Dragana ?or?evi? Zorica Vukovi? |
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Affiliation: | (1) Faculty of Forestry, Kneza Višeslava 1, Belgrade, 11030, Serbia;(2) Polymer Department, ICTM, Center for Chemistry, Studentski trg 12-16, Belgrade, 11001, Serbia;(3) Chemistry Department, Faculty of Science, Mladena Stojanovića 2, Banja Luka, 78000, BiH;(4) Vinča Institute of Nuclear Sciences, P.O. Box 522, Belgrade, Serbia;(5) ICTM—Center for Catalysis and Chemical Enginering, Njegoševa 12, Belgrade, Serbia |
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Abstract: | Two samples of macroporous poly(glycidyl methacrylate-co-ethylene glycol dimethacrylate), poly(GMA-co-EGDMA), were synthesized by suspension copolymerization and modified with amines. Initial poly(GMA-co-EGDMA), and the samples modified with ethylene diamine poly(GMA-co-EGDMA)-en], diethylene triamine poly(GMA-co-EGDMA)-deta] and triethylene tetramine poly(GMA-co-EGDMA)-teta], were characterized by mercury porosimetry, FTIR spectroscopy and elemental analysis. The most pronounced increase
of specific surface area (75%) was observed for poly(GMA-co-EGDMA)-teta sample with smaller particles (D < 150 μm). The Cu(II) sorption was rapid, depending on porosity of amino-functionalized samples and ligand type. For poly(GMA-co-EGDMA)-deta and poly(GMA-co-EGDMA)-teta sorption half time required to reach 50% of total sorption capacity, t
1/2, were around 3 min.
Sorption capacities for Cu(II), Co(II), Cd(II) and Ni(II) as well as for Cr(VI), Co(II), Cd(II) and Ni(II) ions were determined
under competitive conditions as a function of pH, ligand type and porosity at room temperature. The results indicate selectivity
of poly(GMA-co-EGDMA)-deta for Cu(II) over Cd(II) of 3:1 and for Cu(II) over Ni(II) and Co(II) of 6:1. The decrease in particle size of
poly(GMA-co-EGDMA)-teta caused the increase of sorption capacities for all metal ions. At pH 1.8 the selectivity of poly(GMA-co-EGDMA)-teta with smaller particles for Cr(VI) over Ni(II), Co(II) and Cd(II) ions was 8.5:1. |
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