Journal article

Electrochemical incineration of chloranilic acid using Ti/IrO2, Pb/PbO2 and Si/BDD electrodes

The electrochem. oxidn. of chloranilic acid (CAA) was studied in acidic media at Pb/PbO2, B-doped diamond (Si/BDD) and Ti/IrO2 electrodes by bulk electrolysis expts. under galvanostatic control. The obtained results have clearly shown that the electrode material is an important parameter for the optimization of such processes, deciding of their mechanism and of the oxidn. products. The oxidn. of CAA generates several intermediates eventually leading to its complete mineralization. Different current efficiencies were obtained at Pb/PbO2 and BDD, depending on the applied c.d. at 6.3-50 mA cm-2. Also the effect of the temp. on Pb/PbO2 and BDD electrodes was studied. UV spectrometric measurements were carried out at all anodic materials, with applied c.d. of 25 and 50 mA cm-2. These results showed a faster CAA elimination at the BDD electrode. Finally, a mechanism for the electrochem. oxidn. of CAA is proposed according to the results obtained with the HPLC technique. [on SciFinder (R)]


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