Département de chimie moléculaire

A review. Arsenic species can be removed from aq. solns. using the liq.-phase polymer-based retention, LPR, technique. The LPR technique removes ionic species by functional groups of water-sol. polyelectrolytes (WSP) and then using a ultrafiltration membrane that does not let them pass through the membrane, thus sepg. them from the soln. The ability of WSP with groups (R)4N+X- to remove arsenate ions using LPR was studied. The interaction and arsenate anion retention capacity depended on: pH, the quaternary ammonium group's counter ion, and the ratio polymer: As(V), using different concns. of As(V). Water-sol. polychelates were also used for one-step retention of As(III) in soln. The complex of poly(acrylic acid)-Sn, 10 and 20 wt-{%} of metal gave a high retention of As(III) species at pH 8, although the molar ratio polychelate: As(III) was 400:1. The enrichment method was used to det. the max. retention capacity (C) for arsenate anions in aq. solns. at pH 8. In similar conditions, the values of C were 142 mg g-1 for P(ClAETA) and 75 mg g-1 for P(SAETA). The combined treatment of arsenic aq. solns. by electrocatalytic oxidn. (EO) to convert the species of As(III) to As(V) with the LPR technique quant. removed arsenic. [on SciFinder(R)]