Electrooxidation of some phenolic compounds at Bi-doped PbO2
•High surface hydration was observed for PbO2 doped with Bi3+.•The oxidation of phenolic compounds on PbO2-Bi was investigated.•The oxidation rate of organic compounds is proportional to the amount of OH-radicals.•We propose the correlation parameter for PbO2 electrocatalytic properties prediction.
It has been determined that bismuth content in the oxide grows from 0.49 to 1.81 wt% while increasing the Bi3+ ions additive concentration in the solution from 1 to 10 mM. It has been found that ionic additives affect the degree of hydroxylation of lead dioxide surface layer and the bond strength of the oxygen-containing particles. High surface hydration was observed for PbO2 doped with Bi3+. It was determined that the heterogeneous rate constant of oxidation of p-nitroaniline on modified lead dioxide (kv = 2.76 × 10−2 min−1) is half as much as on nonmodified (kv = 1.68 × 10−2 min−1). It has been revealed that the oxidation rate of p-nitrophenol and p-nitroaniline is proportional to the amount of hydroxyl radicals produced during the water oxidation, which is proposed to be used as a correlation parameter for predicting the electrocatalytic properties of materials based on lead dioxide in respect to the oxidation of organic compounds.
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Journal: Applied Catalysis B: Environmental - Volume 162, January 2015, Pages 346–351