The oxidation of phenolic compounds (1,4 chlorophenol and 1,4 nitrophenol) was studied using different electrochemical systems involving ozone formation at PbO2 anodes: i) direct electrolysis at constant current; ii) ex-situ use of O3 and iii) combined use of anodically generated O3 and H2O2 produced at a graphite cathode (cathodic oxidation). We show that the last method gives better results. It seems to be possible to rule out a significant role of O3 in the electrooxidation of phenol at the anode. Rather, the organic compounds react competitively with adsorbed oxygen intermediates (OH and O) leading to an inhibition of O3 formation.
A comparative study of the electro-oxidation of some phenolic compounds by electrogenerated O3 and by direct electrolysis at PbO2 anodes
DE BATTISTI, Achille;
1998
Abstract
The oxidation of phenolic compounds (1,4 chlorophenol and 1,4 nitrophenol) was studied using different electrochemical systems involving ozone formation at PbO2 anodes: i) direct electrolysis at constant current; ii) ex-situ use of O3 and iii) combined use of anodically generated O3 and H2O2 produced at a graphite cathode (cathodic oxidation). We show that the last method gives better results. It seems to be possible to rule out a significant role of O3 in the electrooxidation of phenol at the anode. Rather, the organic compounds react competitively with adsorbed oxygen intermediates (OH and O) leading to an inhibition of O3 formation.I documenti in SFERA sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
