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HF promoted increased nitrogen doping in TiO2(B) photocatalyst
Zhiguang Yin1, Zihao Wang1, Jiani Wang1
1Key Laboratory of Applied Surface and Colloid Chemistry, Ministry of Education, School of Chemistry and Chemical Engineering, Shaanxi Normal University, Xi'an 710119, Shaanxi, China. mayi@snnu.edu.cn.
Chemical Communications (Cambridge, England)
|April 17, 2020
Summary
Nitrogen-doped titanium dioxide (TiO2(B)) shows enhanced visible light absorption and improved photocatalytic activity for hydrogen production and pollutant degradation. This advancement was achieved through a simple pretreatment and annealing process.
Area of Science:
- Materials Science
- Photocatalysis
- Nanotechnology
Background:
- Titanium dioxide (TiO2) is a widely studied photocatalyst.
- Enhancing TiO2's visible light absorption and photocatalytic efficiency remains a key research challenge.
- TiO2(B) is a less common but promising phase of titanium dioxide.
Purpose of the Study:
- To develop a facile method for nitrogen doping of TiO2(B).
- To enhance the visible light absorption and photocatalytic performance of TiO2(B).
- To investigate the impact of nitrogen doping on hydrogen evolution and organic pollutant degradation.
Main Methods:
- Pretreatment of TiO2(B) with hydrofluoric acid (HF).
- Annealing the pretreated TiO2(B) in ammonia (NH3) atmosphere.
- Characterization of nitrogen-doped TiO2(B) for structural and optical properties.
- Evaluation of photocatalytic activity for hydrogen evolution and rhodamine B (RhB) degradation under visible light.
Main Results:
- Successfully achieved increased nitrogen doping in TiO2(B).
- Demonstrated significantly enhanced visible light absorption ability in doped samples.
- Observed a 2.8-fold increase in photocatalytic hydrogen evolution rate.
- Achieved a 4.2-fold increase in RhB degradation rate compared to pristine TiO2(B).
Conclusions:
- Facile HF pretreatment followed by NH3 annealing is an effective method for nitrogen doping TiO2(B).
- Nitrogen doping substantially improves visible light absorption and photocatalytic efficiency of TiO2(B).
- Optimized nitrogen-doped TiO2(B) shows great potential for applications in clean energy and environmental remediation.
