Enhancing Visible Light Photocatalytic Degradation of Bisphenol A Using BiOI/Bi₂MoO₆ Heterostructures

Area of Science:

• Materials Science
• Environmental Chemistry
• Nanotechnology

Background:

• Growing global population necessitates advanced solutions for clean water access.
• Bisphenol A (BPA) is a harmful plastic pollutant requiring effective degradation strategies.
• Photocatalysis using visible light offers a promising renewable energy-based approach for water remediation.

Purpose of the Study:

• To synthesize and characterize BiOI/Bi2MoO6 heterostructures for enhanced photocatalytic degradation of Bisphenol A (BPA).
• To investigate the role of microwave-assisted synthesis in creating efficient photocatalytic materials.
• To elucidate the mechanism and key reactive species involved in BPA degradation.

Main Methods:

• Microwave-assisted synthesis of individual BiOI and Bi2MoO6 photocatalysts.
• Fabrication of BiOI/Bi2MoO6 heterostructures with varying ratios.
• Photocatalytic degradation experiments using Bisphenol A as a target pollutant under visible light.
• Comprehensive characterization including electrochemical, optical, structural, and chemical analyses.
• Free radical scavenging studies to identify reactive species.

Main Results:

• Flower-like BiOI/Bi2MoO6 heterostructures exhibited superior photocatalytic activity for BPA degradation compared to individual components.
• The enhanced activity is attributed to optimized electronic band structures and interfacial contact, promoting charge separation.
• Characterization confirmed the formation of a p-n heterojunction between BiOI and Bi2MoO6.
• Superoxide radicals (O2•−) and holes (h+) were identified as the primary reactive species, with minimal hydroxyl radical (•OH) generation.

Conclusions:

• Microwave-assisted synthesis is effective for producing highly active BiOI/Bi2MoO6 photocatalysts.
• The BiOI/Bi2MoO6 p-n heterojunction demonstrates significant potential for visible-light-driven degradation of BPA.
• Understanding the reactive species involved provides insights for optimizing photocatalytic processes for water purification.