研究目的
Investigating the modification of TiO2's optical and electronic properties through nitrogen doping to enhance its photocatalytic performance under visible light.
研究成果
Nitrogen doping of TiO2 nanocrystals enhances their photocatalytic activity under visible light by narrowing the band gap. The modified sol-gel method using a nonionic surfactant as a structural controller effectively produces N-doped TiO2 with improved properties for environmental applications.
研究不足
The study focuses on the photocatalytic degradation of phenol under visible light, and the findings may not be directly applicable to other pollutants or under different light conditions. The DFT calculations underestimate the band gap, which is a known limitation of the method.
1：Experimental Design and Method Selection:
A modified sol-gel method was used to prepare nitrogen-doped anatase TiO2 nanocrystals, with nonionic surfactant as a structural controller and soft template.
2：Sample Selection and Data Sources:
Pure and N-doped TiO2 samples were synthesized and characterized using various spectroscopic techniques.
3：List of Experimental Equipment and Materials:
X-ray diffractometer, Raman spectrophotometer, UV-Vis NIR spectrophotometer, X-ray photoelectron spectrometer, and other materials like titanium(IV) isopropoxide, hydrochloric acid, deionized water, and 2-propanol.
4：Experimental Procedures and Operational Workflow:
The photocatalytic activity was assessed by the oxidation of phenol under visible light, with phenol concentration measured using a UV-Vis spectrometer.
5：Data Analysis Methods:
The band gap and electronic structure were analyzed using density functional theory (DFT) calculations.
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