Département de chimie moléculaire

Arsenic is one of the most hazardous pollutants, and is present in water, mainly, as As(V) and As(III), and in its inorg. hydrolysis species. Great efforts have been made to develop effective removal techniques. One alternative is the use of water-sol. polymers contg. functional groups to remove these toxic species. This paper presents the synthesis and characterization (FT-IR and 1H NMR spectroscopy, as well as thermogravimetry TG-DSC) of two cationic water-sol. polymers contg. tetra alkylammonium groups, poly[2-(acryloyloxy)ethyl]trimethylammonium chloride, and poly[2-(acryloyloxy)ethyl]trimethylammonium Me sulfate (P(SAETA)). The arsenate retention properties were investigated using the liq.-phase polymer-based retention technique. The polymer structure and the exchangeable anions' nature have been shown to be two important variables in the removal efficiency of arsenate anions from aq. solns. Both investigated polymers were found to efficiently remove HAsO2-4 species from an aq. media, with pH ranging from 6 to 8. The exchange of Me sulfate for the chloride anion on P(SAETA) improved arsenate ion retention ability. The modification of ionic strength by Na2SO4 addn. induced a significant decrease in the cationic polymer's arsenate retention properties. The polymers' retention properties were not studied using real samples. [on SciFinder(R)]