Modification of Biochar Catalyst Using Copper for Enhanced Catalytic Oxidation of VOCs.

Area of Science:

• Materials Science
• Environmental Chemistry
• Catalysis

Background:

• Research increasingly focuses on non-precious metal catalysts and stable carriers for enhanced performance.
• Developing efficient catalysts for volatile organic compound (VOC) degradation is crucial for environmental remediation.

Purpose of the Study:

• To synthesize and characterize copper (Cu)-modified biochar catalysts for high-temperature VOC degradation.
• To investigate the role of enzymatic treatment and activation in enhancing catalyst properties.
• To elucidate the catalytic mechanisms using density functional theory (DFT) calculations.

Main Methods:

• Sequential synthesis of Cu-modified biochar (enzymatic treatment, liquid impregnation, activation).
• Catalytic testing for toluene degradation at 290 °C.
• Characterization of catalyst structure and Cu dispersion.
• DFT calculations to study reaction mechanisms.

Main Results:

• Cu-modified biochar (10%Cu@BCL) showed three times higher toluene degradation than unmodified activated carbon (AC).
• Enzymatic and activation treatments improved Cu dispersion and reduced required Cu loading.
• Cu oxidation state transformation facilitated electron transfer during toluene degradation.
• DFT confirmed the interaction between toluene and the Cu-modified biochar surface.

Conclusions:

• Strategically modified biochar enhances the dispersion and stability of active metal species.
• Cu-modified biochar catalysts offer improved catalytic performance for VOC degradation in high-temperature conditions.
• This approach provides a pathway for developing efficient and cost-effective catalysts for environmental applications.