The electrochemical behavior of lead dioxide and synthetic boron-doped diamond thin film electrodes ~BDDs! has been studied in acid media containing 4-chlorophenol 4-CP by bulk electrolysis under different experimental conditions. In order to quantify the electrochemical activity of a given electrode, for the electrochemical oxidation of organic compounds ~4-CP!, the current efficiency of the anodic oxidation has been normalized taking into consideration mass-transport limitations. The normalized current efficiency ~f! has been defined as the ratio between the current efficiency of the investigated anode to the current efficiency of an ideal anode which has a very fast oxidation rate, resulting in a complete combustion of organics to carbon dioxide. The results have shown that even if the complete combustion of 4-chlorophenol has been achieved at both lead dioxide and boron-doped diamond anodes, the latter give higher f. The difference in reactivity of the electrogenerated hydroxyl radicals on the anode surface, has been proposed to explain the high f values obtained using boron-doped diamond anodes.
Electrochemical Oxidation of 4-Chlorophenol for wastewater treatment. Definition of Anode Activity Parameter
PANIZZA, MARCO;
2001-01-01
Abstract
The electrochemical behavior of lead dioxide and synthetic boron-doped diamond thin film electrodes ~BDDs! has been studied in acid media containing 4-chlorophenol 4-CP by bulk electrolysis under different experimental conditions. In order to quantify the electrochemical activity of a given electrode, for the electrochemical oxidation of organic compounds ~4-CP!, the current efficiency of the anodic oxidation has been normalized taking into consideration mass-transport limitations. The normalized current efficiency ~f! has been defined as the ratio between the current efficiency of the investigated anode to the current efficiency of an ideal anode which has a very fast oxidation rate, resulting in a complete combustion of organics to carbon dioxide. The results have shown that even if the complete combustion of 4-chlorophenol has been achieved at both lead dioxide and boron-doped diamond anodes, the latter give higher f. The difference in reactivity of the electrogenerated hydroxyl radicals on the anode surface, has been proposed to explain the high f values obtained using boron-doped diamond anodes.
I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
