title: Electrochemical degradation of 4-chloroguaiacol for wastewater treatment using PbO2 anodes.
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.
authors.affiliation: UR Electrochimie et Environnement, Ecole Nationale d'Ingénieurs de Sfax, BPW, 3038 Sfax, Tunisia. youssefsamet@yahoo.com
authors.forename: Y
authors.initials: Y
authors.lastname: Samet
authors.forename: S Chaabane
authors.initials: SC
authors.lastname: Elaoud
authors.forename: S
authors.initials: S
authors.lastname: Ammar
authors.forename: R
authors.initials: R
authors.lastname: Abdelhedi
mesh_terms: D002396:Catechols / Q000737:chemistry; D004566:Electrodes; D004572:Electrolysis / Q000379:methods*; D004785:Environmental Pollutants / Q000737:chemistry*; D006139:Guaiacol / Q000031:analogs & derivatives* / Q000737:chemistry; D006863:Hydrogen-Ion Concentration; D007700:Kinetics; D007854:Lead / Q000737:chemistry*; D008298:Maleates / Q000737:chemistry; D010084:Oxidation-Reduction; D010087:Oxides / Q000737:chemistry*; D012044:Regression Analysis; D013696:Temperature; D018508:Water Purification / Q000379:methods*
chemical_list: C517183:4-chloroguaiacol; D002396:Catechols; D004785:Environmental Pollutants; D008298:Maleates; D010087:Oxides; D007854:Lead; C047365:lead oxide; D006139:Guaiacol; C030272:maleic acid; C038861:4-chlorocatechol