Copper-doped perylene diimide supramolecules combined with TiO₂ for efficient photoactivity

Area of Science:

• Materials Science
• Photocatalysis
• Nanotechnology

Background:

• Organic-inorganic hybrid semiconductors are crucial for visible light photocatalysis.
• Perylenediimide supramolecules (PDIsm) offer a promising organic component.
• Enhancing charge transfer and separation is key to improving photocatalyst performance.

Purpose of the Study:

• To synthesize and characterize novel Cu-doped PDIsm (CuPDIsm) and TiO2/CuPDIsm composites.
• To investigate the effect of Cu doping on PDIsm structure and properties.
• To evaluate the photocatalytic performance of TiO2/CuPDIsm composites under visible light.

Main Methods:

• Synthesis of one-dimensional CuPDIsm by introducing Cu into PDIsm.
• Incorporation of CuPDIsm with TiO2 to form heterojunctions.
• Characterization of material properties including visible light adsorption and surface area.
• Photocatalytic degradation experiments using tetracycline and methylene blue as model pollutants.

Main Results:

• Cu doping enhanced visible light adsorption and specific surface area of PDIsm.
• Cu2+ coordination and π-π stacking in CuPDIsm facilitated electron transfer.
• Efficient electron transfer and charge carrier separation were observed at the TiO2/CuPDIsm heterojunction.
• TiO2/CuPDIsm composites achieved high photodegradation efficiencies (89.87% for tetracycline, 97.26% for methylene blue).

Conclusions:

• The developed TiO2/CuPDIsm composites demonstrate excellent photocatalytic activity under visible light.
• Metal doping in organic systems and inorganic-organic heterojunctions are effective strategies for enhancing photocatalysis.
• This research offers new prospects for designing advanced photocatalytic materials.