Browsing by Author "Şungur, Şana Kutun"
Now showing items 1-4 of 4
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A glycidyl methacrylate-based resin with pendant urea groups as a high capacity mercury specific sorbent
Authors:
Publisher and Date:(Elsevier Science Bv, 2003)Polymer-supported pendant urea groups have been demonstrated to be very efficient in selective removal of mercuric ions from aqueous solutions. Methyl methacrylate (0.5 mol)-glycidyl methacrylate (0.4 mol)-divinylbenzene (0.1 mol) terpolymer beads have been prepared by suspension polymerisation. Urea functions have been incorporated into the bead polymer (210-420 mum) via a two-step modification of the epoxy groups involving firstly reaction with excess of triethylenetetramine followed by acidic ...
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Chelate extraction of transition metal ions by ethylene diamine diacetic acid with n-substituted octadecyl groups
Authors:
Publisher and Date:(Taylor & Francis Inc, 2002)An organic-soluble chelating agent NN'-di-n-octadecyl ethylenediamine-NN'-diacetic acid (DOED) has been synthesized in two steps by (i) condensation of dibromoethane with 1-amino octadecane (octadecylamine) and (ii) subsequent reaction with sodium chloro acetate in alcohol-water mixture. The chelating agent in 2-ethylhexanol-cyclohexanol (1:1) solutions shows extremely high chelating ability for Ni(II) Co(II) Cu(II) Fe(111) Cr(III) and Cd(II) ions in neutral aqueous solutions. Extractions take ...
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Metalization of polymer beads via polymer-supported hydrazines as reducing agents
Authors:
Publisher and Date:(John Wiley & Sons Inc, 2002)A new method for depositing metal onto a polymer surface has been developed in which the metal coating of polymer beads is performed with hydrazine functions as reducing agents on the surface of the polymer itself. In this study glycidyl methacrylate-methyl methaerylate-divinyl benzene terpolymer was prepared as spherical beads with a suspension polymerization methodology. Beads of the polymer sample (210-420-mum fraction) containing 3.4 mmol g(-1) epoxy were treated with an excess of hydrazinium ...
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The stability constants of the rare earth complexes with trimetaphosphoric acid
Authors:
Publisher and Date:(Soc Chimica Italiana, 2001)The stability constants of the complexes formed between the rare earth metal ions and the anion of trimetaphosphoric acid have been determined at a temperature of 20 degreesC and an ionic strength of mu =0.1 by the ion-exchange equilibrium method. The investigations indicate that stabilities of complexes increased from La to Lu.The highest and the lowest stability constant values (beta) were found to be 7.76 and 3.82 for Lu3+ and La3+ respectively.
