Preparation of a Z-scheme BiVO₄/Cu₂O/PPy heterojunction and studying its CO₂ reducing properties

Area of Science:

• Materials Science
• Environmental Chemistry
• Nanotechnology

Background:

• Photocatalysis is crucial for environmental remediation.
• Bismuth vanadate (BiVO4) based materials show potential but require enhancement.
• Developing efficient heterostructures is key to improving photocatalytic activity.

Purpose of the Study:

• To synthesize a novel Z-scheme BiVO4/Cu2O/PPy heterostructure photocatalyst.
• To investigate the structural and photocatalytic properties of the developed material.
• To elucidate the mechanism behind the enhanced CO2 reduction.

Main Methods:

• Synthesis of BiVO4/Cu2O/PPy heterostructures using bismuth nitrate, ammonium vanadate, and sodium dodecyl benzyl sulfonate as a soft template.
• Characterization of the synthesized materials.
• Photodegradation experiments to evaluate catalytic efficiency.
• Mechanism studies involving radical trapping and analysis.

Main Results:

• A Z-scheme BiVO4/Cu2O/PPy heterostructure was successfully synthesized with a peanut-like morphology.
• The optimal BiVO4/Cu2O/PPy (5%) composite demonstrated a photodegradation rate 6.57 times higher than pure BiVO4.
• Mechanism studies revealed the involvement of light holes (h+), superoxide radicals (·O2-), and hydroxyl radicals (·OH) in CO2 reduction.

Conclusions:

• The developed Z-scheme BiVO4/Cu2O/PPy heterostructure significantly enhances photocatalytic activity for CO2 reduction.
• The spatial confinement effect of the soft template plays a vital role in material synthesis and performance.
• This work presents a new strategy for designing heterojunction photocatalysts with practical applications in environmental remediation.