2-Chlorophenol oxidation kinetic by photo-assisted Fenton process

Area of Science:

• Environmental Chemistry
• Chemical Engineering
• Water Treatment Technologies

Background:

• 2-chlorophenol is a persistent organic pollutant in industrial wastewater.
• Conventional treatment methods often show limited efficiency for recalcitrant compounds.
• Advanced Oxidation Processes (AOPs) offer promising solutions for wastewater remediation.

Purpose of the Study:

• To experimentally validate a kinetic model for the photo-assisted Fenton oxidation of 2-chlorophenol wastewater.
• To compare the efficiency of the photo-assisted Fenton process with the UV/H2O2 system.
• To investigate and propose reaction kinetics for the treatment process.

Main Methods:

• Experimental investigation of 2-chlorophenol oxidation using the photo-assisted Fenton process.
• Varying reaction conditions, including pH and hydrogen peroxide concentration.
• Kinetic modeling to describe the degradation of 2-chlorophenol and chemical oxygen demand (COD).

Main Results:

• The photo-assisted Fenton process achieved up to 90% removal of 2-chlorophenol within 90 minutes.
• The UV/H2O2 system removed only 16.8% of 2-chlorophenol in one hour.
• Optimal pH for the reaction was found to be between 3.0 and 4.0.
• The reaction kinetics followed a second-order model, with proposed equations for 2-chlorophenol and COD removal.

Conclusions:

• The photo-assisted Fenton process is highly effective for treating 2-chlorophenol wastewater.
• The validated kinetic models accurately predict the experimental outcomes.
• This study confirms the proposed reaction mechanism for the photo-assisted Fenton oxidation process.