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Titania-based nanoheterostructured microspheres for prolonged visible-light-driven photocatalysis
Elizaveta A Konstantinova1,2,3, Anton A Minnekhanov2, German V Trusov4
1Physics Department of Lomonosov Moscow State University, Moscow 119991, Russia.
Nanotechnology
|May 12, 2020
Summary
Nitrogen-doped titanium dioxide (TiO2) microspheres combined with MoO3 or WO3 exhibit enhanced visible-light photocatalysis. These nanocomposites demonstrate prolonged catalytic activity, showing promise for environmental purification applications.
Area of Science:
- Materials Science
- Nanotechnology
- Environmental Chemistry
Background:
- Titanium dioxide (TiO2) is a safe, cost-effective photocatalyst, but its wide band gap limits efficiency under sunlight.
- Doping and heterojunction formation are key strategies to enhance TiO2 photocatalytic activity.
Purpose of the Study:
- To develop novel nitrogen-doped TiO2/MoO3 and TiO2/WO3 nanocomposite photocatalysts.
- To investigate their enhanced photoactivity under visible light and prolonged catalytic effects.
Main Methods:
- Facile synthesis of nitrogen-doped TiO2/MoO3 and TiO2/WO3 microsphere-shaped nanocomposites.
- Characterization using Electron Paramagnetic Resonance (EPR) spectroscopy.
- Evaluation of photocatalytic activity under visible light illumination.
Main Results:
- Synthesized nanocomposites are photoactive under visible light.
- These structures exhibit prolonged catalytic activity for up to 48 hours due to photoinduced charge accumulation.
- EPR spectroscopy identified paramagnetic defects contributing to the enhanced performance.
Conclusions:
- Nitrogen-doped TiO2/MoO3 and TiO2/WO3 nanocomposites offer a promising approach for visible-light photocatalysis.
- The observed prolonged catalytic effect is a significant advancement for applications like environmental purification.
