OP-II-3

PP-III-58The re-activation of the electrode surface was possible with potentiostatic tests byanodically polarizing the electrode above 1.1 V (vs Hg/Hg 2 SO 4 ). The electrooxidationtests were carried out in galvanostatic conditions with a current densitybetween 0.4÷18 mA cm –2 to understand the influence of the anodic current on theorganic decomposition rates and with different ion exchange membranes.Several regenerative treatment runs were performed with the solution simulatingthe shuttle condensate water to determine the evolution, during the tests, of the totalorganic carbon (TOC) concentration, the oxidation intermediate products, thenitrogen molecular concentration using a colorimeter (Orbeco-Hellige model 975-MP)or a spectrophotometer (DR 5000 Hach-Lange), furthermore the pH and conductivitywere monitored during the tests. Fig. 1 compares the TOC abatement for the twodifferent anodes at a current intensity of 0.2 A; a remarkably better performance ofthe SnO 2 -Sb 2 O 5 electrode over the commercial one can be observed.Furthermore, the inversion of the electrode polarity, indicated by small arrows inFig. 1, seemed to offer a further advantageFigure 1. Comparison of the TOC evolution vs time between the Pt/Ru and SnO 2 /Sb 2 O 5anodes in humidity condensates electro-oxidation test in divided cell at 0.2A; Pt/Ru CM (×);SnO 2 /Sb 2 O 5 CM (●). Electrolyte: Na 2 SO 4 0.01 MTest carried out in presence of free chlorine seems to improve the TOCabatement efficiency forming hypochlorous acid.References[1]. Comminelis C., De Battisti A., J. Chim. Phys. (1996) 93, 673-679.[2]. Yao P., Chen X., Wu H., and Wang D., Surf. Coat. Tech (2008) 202, 3850-3855.[3]. Rutigliano L., Fino D., Saracco G., Specchia V., Spinelli P., and Grizzaffi L., J. Appl. Electrochem.(2009) 39, 2239-2249.547