Département de chimie moléculaire

Nanocomposite materials synthesized by incorporation of Pt0 and Pd0 nanoparticles into a poly(pyrrole-alkylammonium) matrix were characterized by TEM. These nanocomposites coated onto C electrodes present strong electrocatalytic properties towards the oxidn. of arsenite to arsenate. Nanocomposite films modified electrodes were used for As(III) anal., with a detection limit reaching 2.4 $μ$M (0.17 ppm). The interest of these nanocomposite electrode materials deposited onto C felt macroelectrodes for the exhaustive electrocatalytic oxidn. of As(III) to As(V) solns. was also demonstrated. The use of a H2O-sol. poly(quaternary ammonium) salt acting both as supporting electrolyte and as extg. agent allowed one to efficiently remove the electrocatalytically generated As(V) species by liq. phase polymer-assisted retention (LPR) technique. [on SciFinder(R)]