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·L−1, Fe2+ 8 mmol·L−1, initial COD 640 mg·L−1, reaction time approximately 24 minutes, and temperature 25°C, the 4-CG and COD percent removal were greater than 80 and 89%, respectively.
Document Type: Research Article
Publication date: December 1, 2009
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