Water‐soluble acidic polyelectrolytes with metal‐removing ability

Abstract

Water‐soluble polymers containing carboxylic acid, phosphonic acid, and sulfonic acid groups were investigated as polychelatogens under different experimental conditions. The maximum retention capacity (MRC) of these polymers was determined at different pH and polymer–metal ion ratios. The metal ions investigated were: Ag(I), Cu(II), Co(II), Ni(II), and Cr(III). The MRC values of the divalent metal ions were found to be very similar and higher than those of the trivalent cations, and there was an important effect of the pH on the MRC. This indicates that the polymer–metal ion interactions were dominated by electrostatic forces. Copyright © 2003 John Wiley & Sons, Ltd.

Determination of the stability constants of uranyl/polymer complexes by differential pulse polarography

“…Polyethyleneimine (PEI; M w 50-60.000) was purchased from Acros (17857-1000). PEI was also reacted with chloropropanesulfonyl chloride (Aldrich: 12,519-9) in order to attach statistically propane sulfonic acid moieties to PEI (PEIPrSO 3 H) [9]. The sulfur content, measured by neutron activation analysis [10] (NAA), gave a molar ratio of propane sulfonate to ethyleneimine units of 0.2.…”

Sulfonamide based polymeric sorbents for selective mercury extraction

“…Because of the high toxicity of all mercury compounds, the extraction of mercuric ions from aqueous wastes and drinking water are special environmental importance. The use of polymer-bonded ligands in selective mercury removal has been the subject of many research articles [3,4] and reviews [5,6]. Two common ligand types, sulfur and amide are being used currently in the design of polymer sorbents for binding mercuric ions selectively.…”

Synthesis and Properties of Hydrophilic Polymers, 10

“…The existence of differences in the complexing ability of the copolymer and the homopolymer has been previously reported19,22 and may be attributed primarily to the structural difference in the repetitive unit of the copolymer. The main reason is that the linear P(MG‐ co ‐HEMA) features structural differences with functional groups, the carboxylic group from the imide of the heterocycle pending from the chain, and the hydroxyl group from the HEMA in the side‐chain, which exhibits a relatively strong complexing power towards metal ions.…”