Département de chimie moléculaire

Electrochem. and ultrafiltration membrane methods (electro-oxidn. and liq. phase polymer based retention technique LPR, resp.) were coupled to remove As(III) inorg. species from aq. solns. The objective was to achieve an efficient extn. of As species by assocg. a polymer-assisted liq. phase retention procedure, based on the As(V) adsorption properties of cationic water-sol. polymers, with the electrocatalytic oxidn. process of As(III) into its more easily removable analog As(V). The exhaustive oxidn. of As(III)-As(V) was readily performed in high yield at Ir oxide film modified C felt electrodes in the presence of different water-sol. poly(quaternary ammonium) salts acting also as supporting electrolyte. The progress of the macro-scale oxidn. of As(III)-As(V) was followed using Ir oxide film modified glassy C electrodes. A study on As retention by LPR-technique performed on fully oxidized solns. of As, showing that complete (100{%}) retention of the As could be achieved using a 20:1 polyammonium:As(III) mole ratio. Copyright © 2009 John Wiley {&} Sons, Ltd. [on SciFinder(R)]