title: Oxidation of As(III) in aqueous solutions by means of macroporous redox copolymers with N-chlorosulfonamide pendant groups.
abstract: The possibility of oxidizing As(III) to As(V) in aqueous solutions by means of heterogeneous oxidants, i.e. synthetic macromolecular redox compounds, was studied. The materials contain N-chlorosulfonamide functional groups in the sodium form: [P]-SO(2)NClNa (R/ClNa, 2.1 mmol/g) or in the hydrogen form: [P]-SO(2)NClH (R/ClH, 2.4 mmol/g), attached to a cross-linked macroporous poly(styrene-divinylbenzene) matrix. They were obtained through the transformation of Amberlyst 15 (Rohm and Haas) commercial cation exchanger's sulfonic functional groups. The experiments were conducted in the H(2)O and 0.01 M NaOH environment (R/ClNa) and in the H(2)O and 0.01 M H(2)SO(4) environment (R/ClH), using the batch process and the column process and NaAsO(2) solutions (93-375 mg As(III)/dm(3)). The experiments showed that the two copolymers' capacity to oxidize As(III) is high and depends on the process conditions. In the column process experiments, conducted using NaAsO(2) solutions with a concentration of ∼ 93 mg As(III)/dm(3) at a flow rate of 4 BV/h (R/ClH) and 6 BV/h (R/ClNa), a breakthrough (defined as the exceedance of 0.05 mg As(III)/dm(3) in the effluent) would occur after the solutions amounting to about 400 bed volumes had been passed through the column.
authors.affiliation: Department of Industrial Chemistry, Wroclaw University of Economics, ul. Komandorska 118/120, 53-345 Wrocław, Poland. elzbieta.kociolek-balawejder@ue.wroc.pl
authors.forename: Elżbieta
authors.initials: E
authors.lastname: Kociołek-Balawejder
authors.forename: Daniel
authors.initials: D
authors.lastname: Ociński
authors.forename: Ewa
authors.initials: E
authors.lastname: Stanisławska
mesh_terms: D001151:Arsenic / Q000737:chemistry*; D002412:Cations; D002713:Chlorine / Q000737:chemistry; D002852:Chromatography, Ion Exchange / Q000379:methods; D003432:Cross-Linking Reagents / Q000737:chemistry; D006859:Hydrogen / Q000737:chemistry; D016877:Oxidants / Q000737:chemistry; D010084:Oxidation-Reduction; D010100:Oxygen / Q000737:chemistry*; D011108:Polymers / Q000737:chemistry; D011137:Polystyrenes / Q000737:chemistry; D012964:Sodium / Q000737:chemistry; D013343:Styrenes / Q000737:chemistry; D013449:Sulfonamides / Q000737:chemistry*; D014753:Vinyl Compounds / Q000737:chemistry; D014874:Water Pollutants, Chemical / Q000032:analysis; D018508:Water Purification / Q000379:methods*
chemical_list: D002412:Cations; D003432:Cross-Linking Reagents; D016877:Oxidants; D011108:Polymers; D011137:Polystyrenes; D013343:Styrenes; D013449:Sulfonamides; D014753:Vinyl Compounds; D014874:Water Pollutants, Chemical; D002713:Chlorine; D006859:Hydrogen; D012964:Sodium; C004985:divinyl benzene; D001151:Arsenic; D010100:Oxygen