Electrochemical degradation of vanillin using lead dioxide electrode: influencing factors and reaction pathways.

Environmental Technology
Yuhan DiaoYingwu Yao

Abstract

In this study, a novel PbO2-CeO2 composite electrode was applied it to the electrocatalytic degradation of vanillin. The operating parameters such as applied current density, initial vanillin concentration, supporting electrolyte concentration and pH value were investigated and optimised. After 120 min, in a 0.10 mol L-1 Na2SO4 solution with a current density of 50 mA cm-2 and a pH value of 5.0 containing 30 mg L-1 vanillin, the vanillin removal efficiency can reach 98.03%, the COD removal efficiency is up to 73.28%. The results indicate that electrochemical degradation has a high ability to remove vanillin in aqueous solution. The reaction follows a pseudo-first-order reaction kinetics model with rate constants of 0.03036 min-1. In the process of electrochemical degradation, up to eight hydroxylated or polyhydroxylated oxidation by-products were identified through hydroxylation, dealkylation and substitution reactions. Furthermore, the degradation pathways were proposed, which eventually mineralised into inorganic water and carbon dioxide.

References

Sep 22, 2007·International Journal of Food Sciences and Nutrition·Arun K SinhaNandini Sharma
Aug 8, 2009·Chemical Reviews·Marco Panizza, Giacomo Cerisola
Mar 9, 2010·Journal of Hazardous Materials·Ying WangXiaochun Chen
Mar 25, 2011·Chemical Society Reviews·Xiaohong LiFrank C Walsh
May 24, 2015·Environmental Science and Pollution Research International·Sajjad HussainArtur J Motheo
Jul 4, 2018·Topics in Current Chemistry·Yuting ZhuChenguang Wang

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