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Functionalized C@TiO2 hollow spherical architecture for multifunctional applications.

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Hierarchical hollow titania spheres decorated with functionalized carbon dots were synthesized. These spheres exhibit excellent dye adsorption and photocatalytic activity, showing potential for environmental remediation and solar energy applications.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Environmental Chemistry

Background:

  • Developing novel nanostructures for efficient pollutant removal and energy conversion is crucial.
  • Hierarchical titania (TiO2) architectures offer unique properties for advanced applications.
  • Carbon dots can enhance the functionality of inorganic nanomaterials.

Purpose of the Study:

  • To synthesize hierarchical anatase titania hollow spheres decorated with functionalized carbon dots (C(F)@THS).
  • To investigate the structural, optical, and surface properties of the synthesized material.
  • To evaluate the performance of C(F)@THS in dye adsorption and as a component in dye-sensitized solar cells (DSSCs).

Main Methods:

  • Solvothermal decomposition of titanium(IV) isopropoxide (TTIP) in the presence of thiourea and citric acid.
  • Characterization using BET surface area analysis, FESEM, TEM, PL spectroscopy, Raman spectroscopy, and XPS.
  • Dye adsorption experiments with methylene blue and methyl violet.
  • Fabrication and testing of dye-sensitized solar cells (DSSCs) using the synthesized material.

Main Results:

  • Hierarchical hollow spherical anatase TiO2 decorated with functionalized carbon dots (C(F)@THS) was successfully synthesized.
  • The material exhibited mesoporosity with a surface area of 81 m²/g and demonstrated fast, selective dye adsorption.
  • Calcined TiO2 hollow spheres (THS) showed efficient photocatalytic activity (k = 9.36 × 10⁻² min⁻¹) and served as effective photoanodes in DSSCs (efficiency = 6.48%).

Conclusions:

  • The co-existence of thiourea and citric acid is essential for forming the hierarchical hollow architecture.
  • C(F)@THS is a promising material for dye adsorption and wastewater treatment.
  • The derived TiO2 hollow spheres (THS) are efficient and reusable photocatalysts and photoanodes for solar energy applications.