VUV/UV light inducing accelerated phenol degradation with a low electric input

Area of Science:

• Environmental Chemistry
• Photochemistry
• Chemical Engineering

Background:

• Phenol is a common industrial pollutant requiring effective removal methods.
• Conventional Fenton processes can be slow and less efficient for certain pollutants.
• Advanced Oxidation Processes (AOPs) offer promising solutions for wastewater treatment.

Purpose of the Study:

• To investigate the accelerated degradation of phenol using a mini-fluidic VUV/UV photoreaction system (MVPS) combined with Fenton's reagent.
• To identify reactive oxygen species involved in the degradation process.
• To optimize reaction conditions for efficient phenol removal.

Main Methods:

• Utilized a mini-fluidic VUV/UV photoreaction system (MVPS) with a low-pressure mercury lamp.
• Employed Fenton's reagent (H2O2 and Fe3+) for accelerated degradation.
• Used radical scavengers to identify reactive species (HO˙ and HO2˙).
• Systematically varied phenol, H2O2, and Fe3+ concentrations, and solution pH.

Main Results:

• Achieved complete phenol degradation within 4-6 minutes.
• Identified hydroxyl (HO˙) and hydroperoxyl (HO2˙) radicals as key species.
• Phenol degradation rate increased with higher H2O2 and Fe3+ concentrations.
• Optimal phenol degradation occurred at pH 3.7.
• Higher phenol concentrations enhanced photon absorption at 254 and 185 nm.

Conclusions:

• The VUV/UV photo-Fenton process significantly accelerates phenol degradation.
• The MVPS is effective for rapid removal of phenol and related aromatic pollutants.
• This technology shows strong potential for industrial wastewater treatment applications.