Web Release Date: February 21,
Synthesis and Characterization of Phosphonate Ester/Phosphonic Acid Grafted Styrene-Divinylbenzene Copolymer Microbeads and Their Utility in Adsorption of Divalent Metal Ions in Aqueous Solutions
and
Institute of Chemistry Romanian Academy, Bd. Mihai Viteazul 24, R-300223 Timisoara, Romania, Physical Chemistry Department, Faculty of Industrial Chemistry and Enviromental Engineering, "Politehnica" University, Bul. V. Parvan 6, 300223 Timisoara, Romania, and Crystal Engineering, Growth and Design Laboratory, Department of Chemistry, University of Crete, Heraklion, Crete, GR-71003, Greece
Received for review June 28, 2007
Revised manuscript received November 7, 2007
Accepted December 24, 2007
Abstract:
In this paper the preparation and characterization of some chelating resins, phosphonate grafted on polystyrene-divinylbenzene supports, are reported. The resins were prepared by an Arbuzov-type reaction between chloromethyl polystyrene-divinylbenzene copolymers and triethylphosphite, yielding the phosphonate ester copolymer (resin A). This can be hydrolyzed by HCl to yield the phosphonate/phosphonic acid copolymer (resin B). The phosphonate resins A and B were characterized by determination of the phosphorus content, infrared spectrometry, and thermal analysis. The total sorption capacity of the phosphonate ester functionalized resin (A) and phosphonate/phosphonic acid functionalized resin (B) for divalent metal ions such as Ca2+, Cu2+, and Ni2+ was studied in aqueous solutions. Resin A retains ~3.25 mg of Ca2+/g of copolymer and 2.75 mg of Cu2+/g of copolymer, but retains no Ni2+ at pH 1. On the other hand, resin B retains 8.46 mg of Ca2+/g of copolymer, 7.17 mg of Cu2+/g of copolymer, and no Ni2+ at pH 1. Efficient Ni2+ retention was observed at pH 7 only for the phosphonate/phosphonic acid functionalized resin (B) at the level of 19 mg of Ni2+/g of polymer B. Polymer A was incapable of retaining Ni2+ at pH 7.
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