以纳米管钛酸为前驱体制备TiO2石墨烯(碳纳米管)及其可见光催化性能研究.docx

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Title: Preparation of TiO2 Graphene (Carbon Nanotube) Composite and its Visible Light Photocatalytic Performance: A Study
Introduction:
In recent years, the utilization of nanomaterials for various applications has gained significant attention due to their unique properties and performance. Titanium dioxide (TiO2) is a widely studied and utilized photocatalyst due to its excellent photocatalytic properties, chemical stability, and low cost. However, TiO2 exhibits limited photocatalytic activity under visible light irradiation. To enhance its photocatalytic performance in the visible light region, various modifications have been explored, including the incorporation of graphene (GR) and carbon nanotubes (CNTs) to form TiO2-GR and TiO2-CNT composites. This paper aims to investigate the synthesis of TiO2-GR and TiO2-CNT composites using TiO2 nanotubes as precursors and the evaluation of their visible light photocatalytic performance.
Methods:
1. Synthesis of TiO2 Nanotubes: The TiO2 nanotubes are synthesized using a hydrothermal method. Titanium isopropoxide (TTIP) is used as the precursor, and deionized water serves as the solvent. The reaction is carried out at a controlled temperature for a specific duration to obtain TiO2 nanotubes.
2. Preparation of TiO2-GR Composite: The TiO2-GR composite is prepared by adding an appropriate amount of graphene oxide (GO) to an ethanolic dispersion of TiO2 nanotubes. The mixture is subsequently sonicated and then thermally treated to obtain the TiO2-GR composite.
3. Preparation of TiO2-CNT Composite: The TiO2-CNT composite is prepared by dispersing CNTs into the dispersion of TiO2 nanotubes followed by sonication. The mixture is then thermally treated to obtain the TiO2-CNT composite.
4. Characterization: The synthesized TiO2 nanotubes, TiO2-GR, and TiO2-CNT composites are characterized using techniques such as X-ray diffraction (XRD), transmission electron microscopy (TEM), scanning electron microscopy (SEM), and UV-visible spectroscopy.
5. Photocatalytic Evaluation: The visible light photocatalytic performance of the TiO2-GR and TiO2-CNT composites is studied by the degradation of a model organic pollutant, such as methylene blue (MB) or rhodamine B (RhB). The degradation efficiency is measured by monitoring the absorbance of the pollutant solution at specific time intervals.
Results:
The characterization results reveal the successful synthesis of TiO2 nanotubes, TiO2-GR, and TiO2-CNT composites. The XRD patterns confirm the formation of anatase TiO2 phase, while TEM and SEM images show the morphology of nanotubes, graphene, and CNTs. UV-visible spectroscopy analysis demonstrates the enhanced visible light absorption of the composites compared to pure TiO2.
The photocatalytic evaluation results show that both TiO2-GR and TiO2-CNT composites exhibit significantly improved visible light photocatalytic activity compared to pure TiO2. The incorporation of graphene and CNTs creates new photoactive sites, enhances charge separation, and reduces electron-hole recombination, leading to enhanced photocatalytic performance.
Conclusion:
In conclusion, TiO2-GR and TiO2-CNT composites have been successfully synthesized using TiO2 nanotubes as precursors. The composites exhibit enhanced visible light photocatalytic performance compared to pure TiO2. The enhancement in photocatalytic activity can be attributed to the unique properties of graphene and CNTs, including their high surface area, electron transport capabilities, and strong light absorption. The synthesized TiO2-GR and TiO2-CNT composites hold promising potential in various applications, including environmental remediation and solar energy conversion. Further research should focus on optimizing the synthesis conditions and exploring the underlying mechanisms for improved performance.