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  • Title: Electrochemical degradation of 4-chloroguaiacol for wastewater treatment using PbO2 anodes.
    Author: Samet Y, Elaoud SC, Ammar S, Abdelhedi R.
    Journal: J Hazard Mater; 2006 Dec 01; 138(3):614-9. PubMed ID: 16844292.
    Abstract:
    Electrochemical oxidation of 4-chloroguaiacol (4-CG) at Nb/PbO(2) anodes was studied under different experimental conditions such as initial concentration of substrate, electrolysis time, temperature and pH. We measured the concentrations of 4-chlorocatechol (4-CC), 2-methoxyhydroquinone (2-MHQ), maleic acid (MA) and carbon dioxide as the main products. Black solid particles consisting mainly of polymers were formed during electrolysis. A mechanism of electrochemical oxidation of 4-CG was investigated. The oxidation of 4-CG can generally be described by simple pseudo first-order kinetics. The degradation of 4-CG was favoured at high temperature and lower initial concentration of 4-CG and low solution pH. However, the increase of temperature has not a significant effect on the mineralization of carboxylic acids. Moreover, these products required long electrolysis time.
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