title: Degradation of 4-chloroguaiacol by dark Fenton and solar photo-Fenton advanced oxidation processes.
abstract: This paper evaluates the dark Fenton and the solar photo-Fenton advanced oxidation processes for the treatment of solutions containing 4-chloroguaiacol (4-CG). The 4-CG was chosen as a model compound found in pulp and paper wastewater formed in the bleaching process in the pulp industry. The effects of operating parameters, including reaction time, hydrogen peroxide-to-ferrous iron molar ratio (H2O2/Fe2+), initial chemical oxygen demand (COD), pH value, and temperature, on 4-CG degradation efficiency using the solar photo-Fenton process were investigated. It was demonstrated that both processes could effectively degrade 4-CG in water and followed first-order kinetics. The degradation rate in solar photo-Fenton oxidation was much faster than that of the dark reaction. The 4-CG degradation depends on its concentration in the solution. The degradation efficiency decreases when the concentration of the 4-CG increases. Under the conditions of pH 3, H2O2/Fe2+ molar ratio 2, H2O2 16 mmol x L(-1), Fe2+ 8 mmol x L(-1), initial COD 640 mg x L(-1), reaction time approximately 24 minutes, and temperature 25 degrees C, the 4-CG and COD percent removal were greater than 80 and 89%, respectively.
authors.affiliation: Electrochemistry and Environment Laboratory, National Engineering School of Sfax, Tunisia. youssefsamet@yahoo.com
authors.forename: Youssef
authors.initials: Y
authors.lastname: Samet
authors.forename: Mohamed
authors.initials: M
authors.lastname: Ayadi
authors.forename: Ridha
authors.initials: R
authors.lastname: Abdelhedi
mesh_terms: D003624:Darkness; D005296:Ferrous Compounds / Q000737:chemistry; D006139:Guaiacol / Q000031:analogs & derivatives* / Q000737:chemistry; D006861:Hydrogen Peroxide / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D007220:Industrial Waste; D007501:Iron / Q000737:chemistry*; D007700:Kinetics; D010084:Oxidation-Reduction; D013472:Sunlight; D013696:Temperature; D014865:Waste Disposal, Fluid / Q000379:methods*; D014874:Water Pollutants, Chemical / Q000737:chemistry*
chemical_list: C517183:4-chloroguaiacol; C045076:Fenton's reagent; D005296:Ferrous Compounds; D007220:Industrial Waste; D014874:Water Pollutants, Chemical; D006139:Guaiacol; D006861:Hydrogen Peroxide; D007501:Iron