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Optically Active Oxygen Defects in Titanium Dioxide Doped with Inorganic Acid Ions
Bin Xu1,2, Xuehui Duan1, Tao Zhou1,2
1State Key Laboratory of Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Tongji University, Shanghai 200092, China.
Nanomaterials (Basel, Switzerland)
|June 26, 2024
Summary
Doping titanium dioxide (TiO2) with inorganic acid ions enhances photocatalytic activity. Nitrate (NO3-) doping creates oxygen vacancies ([Ti3+]-V0-[Ti3+]), significantly boosting performance for air pollutant degradation.
Area of Science:
- Materials Science
- Photocatalysis
- Environmental Chemistry
Background:
- Oxygen vacancies are key to photocatalytic activity in titanium dioxide (TiO2).
- Doping TiO2 with inorganic acid ions is a strategy to enhance its photocatalytic properties.
Purpose of the Study:
- To investigate the effect of inorganic acid ion doping (Cl-, NO3-, SO42-) on TiO2 photocatalytic activity.
- To identify the role of oxygen vacancies in doped TiO2.
- To determine optimal preparation conditions for enhanced TiO2 photocatalysts.
Main Methods:
- Sol-gel synthesis of TiO2 doped with Cl-, NO3-, and SO42- ions.
- Characterization of oxygen vacancies and their correlation with photocatalytic activity.
- Optimization of sol-gel preparation parameters (pH, calcination temperature, electrolyte).
Main Results:
- Two types of oxygen vacancies were identified: [Ti3+]-V0-[Ti3+] in NO3-/TiO2 and [Ti3+]-Cl in Cl-/TiO2.
- NO3-/TiO2 exhibited significantly higher photocurrent than Cl-/TiO2.
- SO42-/TiO2 showed minimal oxygen vacancies and negligible photocurrent due to unstable sol formation.
- Optimal conditions include pH 3, 550 °C calcination, and alkaline electrolyte.
Conclusions:
- Nitrate doping effectively introduces beneficial oxygen vacancies ([Ti3+]-V0-[Ti3+]) in TiO2, enhancing photocatalytic activity.
- Optimized sol-gel process parameters are crucial for developing efficient TiO2-based photocatalysts.
- This study offers a new approach for designing advanced photocatalysts for air purification.
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