Syntheses of polymer-supported amidophosphates and investigating their divalent metal ion affinity.
Item
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Title
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Syntheses of polymer-supported amidophosphates and investigating their divalent metal ion affinity.
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Identifier
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AAI3310651
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identifier
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3310651
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Creator
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Pustam, Amanda N.
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Contributor
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Adviser: Spiro D. Alexandratos
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Date
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2008
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Language
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English
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Publisher
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City University of New York.
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Subject
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Chemistry, Polymer | Chemistry, General
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Abstract
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Functionalized polymers are of interest because of their wide applications in areas of separation science, sensor design and organic synthesis. This research, divided into two parts, focused on designing complexants for immobilization onto polymers for the purpose of metal ion sequestration and secondly, for the removal of methyl-t-butyl ether (MTBE) from aqueous solutions.;In the first part of this project, the polymers investigated contained amide and phosphate ester groups. These functional groups were chosen as they contain coordination sites for metal ion chelation. The prepared polymers were characterized and evaluated for their divalent metal ion affinities at pH 2. Divalent metal ion affinity was found to follow the sequence Pb(II) > Cu(II) > Cd(II) > Zn(II) > Ni(II). The effect of a spacer chain between the ligand's binding sites on metal ion affinities was investigated. Increasing the length of the hydrocarbon spacer elicited a decrease in metal ion affinities. When the spacer chain contained a donor atom, an increase in divalent metal ion affinity was observed compared to its absence. Some results with trivalent metal ions such as Fe(III), Eu(III), Al(III) were included. Uptake of these metal ions by 2-(2-amidoethoxy)ethyl phosphate resins were about the same, although Fe(III) sorption was the highest. A mechanism that explained how metal ion complexation may occur was proposed.;Characteristics of polymer-supported reagents important for MTBE removal were identified. Polymer-supported calixarenes and polymers with p-cresol sorbed in its pores can be potential candidates for further studies. A procedure for plugging pores was found which has potential in improving separations of extraction chromatographic resins.
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Type
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dissertation
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Source
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PQT Legacy CUNY.xlsx
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degree
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Ph.D.
