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    Cu(II) sorption performance of novel chitosan/ter-(vinyl pivalate-maleic anhydride-N-tert-butylacrylamide) microcapsules
    (SPRINGER, 2019) Okudan, Ahmet.; Ataoglu, Busra Ebru.; Sengoz, Onur.; Arslan, Gulsin.
    In this study, first, the ter-polymerization reaction between vinyl pivalate (VP), maleic anhydride (MA), and N-tert-butylacrylamide (NTBA) was done in inert atmosphere (N-2). FT-IR and (HNMR)-H-1 spectroscopy was applied to study the chemical composition of the obtained ter-polymers. MA content of the ter-polymers was determined by following the chemical titration method. Second, novel chitosan/ter-(vinyl-pivalate-maleic-anhydride-N-tert-butylacrylamide) microcapsules were synthesized. In microcapsule production, chitosan polymer served as a matrix for acrylamide ter-polymers with four different molar ratios. The microcapsules were characterized by FT-IR and SEM analyses. Cu(II) sorption efficiency of the microcapsules were tested at different pH levels, temperature, sorbent dosage, and metal ion concentration. Comparison with blank chitosan microbeads revealed that incorporation of acrylamide ter-polymers into the cross-linked chitosan matrix increased the metal sorption. Sorption capacities of the sorbents were recorded; blank chitosan microbeads: 67.03 mg g(-1), and chitosan/acrylamide ter-polymer microcapsules: in range of 75.39-98.64 mg g(-1). The findings demonstrated chitosan/acrylamide ter-polymer microcapsules can be utilized in sorption of Cu(II) ions in water treatment.
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    Cu(II) sorption performance of silane-modified poly(NaSS-co-MA-co-AAm) and poly(NaSS-co-MA-co-NIPAM) terpolymers
    (SPRINGER, 2019) Okudan, Ahmet.; Ozviran, Emre.; Arslan, Gulsin.; Sargin, Idris.
    This study reports the adsorption of Cu(II) ion by 3-(2-aminoethylamino) propyldimethoxymethylsilane-modified terpolymers. Water-soluble poly(sodium 4-styrenesulfonate-co-maleic anhydride-co-acrylamide) [poly(NaSS-co-MA-co-AAm)] and poly(sodium 4-styrenesulfonate-co-maleic anhydride-co-N-isopropylacrylamide) [poly(NaSS-co-MA-co-NIPAM)] terpolymers were synthesized and then modified with silane to make them water-insoluble. H-1-NMR and FT-IR spectroscopy was used to study the chemical composition of the terpolymers. Also, acid number and viscosity of the polymers were determined. Cu(II) ion adsorption parameters (adsorbent dosage, contact time, pH and metal ion concentration) were studied, and the equilibrium data were evaluated using adsorption isotherm models; Freundlich isotherm gave the best fit. Cu(II) adsorption performance of poly(NaSS-co-MA-co-AAm) and poly(NaSS-co-MA-co-NIPAM) terpolymers was found to be 53.42 and 43.10%, respectively. The terpolymers can be used for removal of Cu(II) from aqueous media.