Using SiO₂-Supported MnO₂@Fe₂O₃ Composite to Catalytically Decompose Waste Drilling Fluids Through Fenton-like...

Area of Science:

• Environmental Chemistry
• Catalysis
• Materials Science

Background:

• Waste drilling fluids from oil extraction pose significant ecological risks.
• Effective treatment methods are crucial for sustainable oil extraction and environmental protection.
• Conventional treatment methods may lack efficiency in degrading complex organic pollutants.

Purpose of the Study:

• To develop and evaluate a novel composite catalyst for the degradation of waste drilling fluids.
• To investigate the efficiency of a Fenton-like reaction using SiO2-supported MnO2@Fe2O3 for pollutant removal.
• To compare the catalytic performance against traditional Fenton reagents.

Main Methods:

• Utilized a Fenton-like reaction employing SiO2-supported MnO2@Fe2O3 as a catalyst with hydrogen peroxide (H2O2).
• Investigated the catalytic activity at 60 °C for 4 hours.
• Measured the reduction in chemical oxygen demand (COD) as the primary indicator of degradation efficiency.

Main Results:

• The SiO2-supported MnO2@Fe2O3 catalyst achieved a COD reduction of over 95% (36,495 mg L-1).
• The catalyst demonstrated superior performance compared to the traditional Fenton reagent (FeSO4), which achieved an 84% reduction (32,285 mg L-1).
• The MnO2@Fe2O3 interface effectively generated highly active ·OH radicals for organic substance degradation.

Conclusions:

• SiO2-supported MnO2@Fe2O3 is a highly effective composite catalyst for treating waste drilling fluids via Fenton-like reactions.
• This method offers a significant improvement over traditional Fenton reagents, enhancing pollutant removal efficiency.
• The developed catalyst presents a practical and valuable solution for the environmental management of oil extraction byproducts.