Electroassisted methods for waste destruction: silver(II) and peroxydisulfate reagents in the electrochemically mediated oxidation of polyaromatic sulfonates.
The electrochemical oxidation is a promising process for organic pollutants which are recalcitrant to biological degradation. The anodic oxidation of 1,5-naphthalenedisulfonic acid, hereafter NDS, was evaluated at a Pt anode using in situ generated Ag(II) cation or peroxydisulfate [S2O(8)(2-)] anion as mediators. Kinetics of the direct chemical oxidation of NDS in the presence of Na2S2O8, and the identification of some oxidation intermediates are also reported. An analysis of the results shows that Ag(II) is characterized by a high-reaction rates, while [S2O(8)(2-)] performs the oxidation of NDS in a complete way.
Ravera
Mauro
M
Dipartimento di Scienze dell'Ambiente e della Vita, Università del Piemonte Orientale, Amedeo Avogadro, Spalto Marengo 33, 15100 Alessandria, Italy.
Ciccarelli
Cesare
C
Gianotti
Valentina
V
Scorza
Sonia
S
Osella
Domenico
D
D004572:Electrolysis / Q000379:methods*; D007700:Kinetics; D010084:Oxidation-Reduction; D012834:Silver / Q000737:chemistry*; D013451:Sulfonic Acids / Q000737:chemistry*; D014865:Waste Disposal, Fluid / Q000379:methods*; D014874:Water Pollutants, Chemical / Q000032:analysis*
D013451:Sulfonic Acids; D014874:Water Pollutants, Chemical; D012834:Silver