Département de chimie moléculaire

Nanocomposite materials were synthesized by electrodeposition of Ir oxide nanoparticles into poly(pyrrole-alkylammonium) films coated by oxidative electropolymn. of a pyrrole-alkylammonium monomer onto C electrodes, and characterized by electrochem. in aq. electrolytes and by TEM. Ir oxide-based nanocomposite electrode materials appeared efficient electrocatalysts for the oxidn. of As(III) into As(V) species at low potentials, i.e. in the 0.3-0.7 V vs. Ag/AgCl range, and over a large pH range. Bulk electrocatalytic oxidn. of arsenite solns. could be performed in the presence of a water-sol. poly(quaternary ammonium) salt acting as the supporting electrolyte and also as an As(V) complexing agent, which allowed the combination of electrocatalytic oxidn. of As(III) with the liq. phase polymer-assisted retention (LPR) technique to efficiently remove As from polluted solns. [on SciFinder(R)]