The influence of calcination temperature of a Ti/Sno2-Sb electrode manufactured by Pechini’s method on phenol electroxidation Iranildes D. dos Santos1*, Júlio C. Afonso2, Achilles J. B. Dutra1 1 PEMM/COPPE/UFRJ, C.P.68.505, CEP 21941-972, Rio de Janeiro, RJ, Brazil 2 Department of Analytical Chemistry/IQ/UFRJ, Rio de Janeiro, RJ, Brazil e-mail: firstname.lastname@example.org A variety of electrode materials (Ti/RuO2, Ti/IrO2, Pt, Ti/PbO2, BDD, Ti/SnO2-Sb) has been used for the electrolytical treatment of effluents containing organic pollutants. The high oxidation efficiency of organic pollutants with the Ti/SnO2-Sb electrode was reported in several papers. This behavior is attributed to the elevated oxygen overpotential, which favors the generation of OH radicals for the oxidation of the organic matter on the electrode surface. A number of methods can be used for the manufacturing of the SnO2 electrode doped with Sb, as the sol-gel process, sputtering, electrodeposition and the Pechini’s method. The last one presents the advantage of preventing the evaporation of metallic ions during the film calcination step. The objective of this paper is evaluating the influence of calcination temperature of the Ti/SnO2-Sb electrode, prepared by Pechini’s method, for the oxidation of phenol in sodium chloride solutions, simulating the water produced by oil platforms. The electrodes were prepared with titanium plates previously polished and treated in a boiling solution of oxalic acid (10%) for 10 minutes. The precursory solution was prepared with tin citrate, citric acid and ethylene glycol. The oxide film contained 93% and 7%(w/w) of SnO2 and Sb oxides respectively. SEM micrographs allied to EDS spectra indicated that the film morphology and local composition changed with the electrodes calcination temperature. At 400oC, the presence of regions with a low tin content was detected. At 500oC, agglomerates with a high tin level were detected. An even tin distribution on the electrode surface was achieved at 600oC. The presence of both, Sb5+ and Sb3+, was detected by chemical analysis. These tests indicated that the presence of Sb5+ decreased with the calcination temperature increase, probably due to the decomposition of Sb2O5 to Sb2O3, which occurs at temperatures higher than 340oC. Cyclic voltammograms, indicated an increase on the current density with the calcination temperature increase. A reduction of 81% of phenol absorbance was achieved after 30 minutes of electrolysis, at 20 mA/cm2 with an electrode calcined at 600oC.