研究目的
Investigating the tuning of the optical band gap of pure TiO2 via a photon-induced method to enhance its photocatalytic activity under visible light.
研究成果
The study successfully demonstrates the synthesis of oxygen-rich TiO2 nanoparticles with a modified optical band gap and high stability via the Photon Induced Method. The nanoparticles exhibit pure anatase phase stability up to 750°C and a narrowed band gap of 3.09 eV, facilitating visible light absorption. The photocatalytic activity of the PIM-prepared TiO2 nanoparticles is significantly enhanced, degrading Methylene Blue within 40 minutes under solar light, outperforming the standard Degussa P25 sample.
研究不足
The study focuses on the synthesis and characterization of TiO2 nanoparticles via PIM and their photocatalytic activity under visible light. The limitations include the specific conditions required for the PIM synthesis and the need for further optimization of the photocatalytic efficiency.
1：Experimental Design and Method Selection:
The study employs a novel Photon Induced Method (PIM) for the synthesis of oxygen-rich TiO2 nanoparticles. The method involves the irradiation of a mixture of Titanium Tetra Isopropoxide and double distilled water under a 250W - 24 V Halogen light, followed by calcination at various temperatures.
2：Sample Selection and Data Sources:
Pure TiO2 nanoparticles are prepared and calcinated at 550°C, 650°C, and 750°C for characterization and photocatalytic activity evaluation.
3：List of Experimental Equipment and Materials:
Includes a Bruker D8 Advance powder X-ray diffractometer, FEI Quanta FEG 200 High Resolution Scanning Electron Microscope, JEOL 300 kV transmission electron microscope, Perkin Elmer Spectrum Version 10.4.00 for FTIR analysis, and Varian Cary Bio 50 spectrometer for UV-Visible spectrum recording.
4：00 for FTIR analysis, and Varian Cary Bio 50 spectrometer for UV-Visible spectrum recording.
Experimental Procedures and Operational Workflow:
4. Experimental Procedures and Operational Workflow: The synthesis involves stirring under halogen light irradiation, pH adjustment with ammonia solution, and calcination. Characterization techniques include XRD, HRSEM, HRTEM, FTIR, UV-Vis, and PL analyses.
5：Data Analysis Methods:
The crystallite size is calculated using Scherrer’s equation from XRD data. The optical band gap is determined from UV-Vis absorption studies.
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