Abstract
The anodic oxidation of Novacron Blue (NB) has been studied by electrochemical measurements (cyclic voltammetry and polarization curves) and bulk electrolysis employing single flow cell (SFC) and dual flow cell (DFC), using Ti/Pt and Ti/Pt-SbSn as electrocatalytic materials. The results of voltammetries showed that with both anodes, in the potential region before oxygen evolution, the oxidation of NB involves simple electrode transfer, while a very different behavior was observed in the region of water decomposition. At the polarization curves, it was observed that Ti/Pt has lower activity due to lower production of hydroxyl radicals that destroy NB dye in solution, because it has a low overpotential for oxygen evolution and this secondary reaction is favored over mineralization. Conversely, Ti/Pt-SbSn showed significant electrocatalytic activity to oxidize NB. The results of bulk electrolysis showed that the use of SFC or DFC influences the elimination efficiency of color and dissolved organic matter. In the case of DFCTi/Pt+Ti/Pt-SbSn, after 5 h of electrolysis by applying 30 and 60 mA cm−2 at each one of the electrodes, complete color removal and ≈60 % of chemical oxygen demand (COD) elimination were obtained with lower energy consumption requirements when compared with the single electrochemical systems, SFCTi/Pt and SFCTi/Pt-SbSn.
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