No abstract

No abstract

No abstract

Nanosized boron(III) oxide-doped titania was prepared by homogeneous hydrolysis of titanium oxo-sulfate with urea in aqueous solutions in the presence of amorphous boron. The prepared samples were annealing at 700 degrees C. The structure of as-prepared samples was characterized by X-ray powder diffraction (XRD) and selected area electron diffraction (SAED) and surface area (BET) and porosity determination (BJH). The morphology and microstructure characteristics were obtained by scanning electron microscopy (SEM) and high-resolution electron microscopy (HRTEM). The method of UV/vis diffuse reflectance spectroscopy was employed to estimate band gap energies of the boron-doped titania. The photoactivity of the prepared samples was assessed by the photocatalytic decomposition of Orange II dye in an aqueous slurry during irradiation at 365 and 400 nm wavelength. The prepared titania samples doped with boron(III) oxide showed better photocatalytic activity in comparison with the reference TiO(2) sample. These photocatalysts showed better photocatalytic performance under visible-light irradiation.

The optically transparent particles of titanium dioxide (rutile modification) were prepared by hydrolysis of aqueous solution of titanium(III) chloride in the presence of hydroxyethyl methacrylate. The transparent TiO 2 doped with Ag or Pd nanoparticles was incorporated in a poly(hydroxyethyl methacrylate) thin layer and deposited on a quartz surface. The transparent particles of titania were characterized by measurement of particle size distribution, high-resolution transmission electron microscopy and selected area electron diffraction. Photocatalytic activity of prepared thin layers was determined by mineralization of Orange II dye, salicylic acid, butane, and acetone under UV radiation. The effects of the Ag and Pd doping on the morphology and microstructure of transparent TiO 2 nanoparticles and their impacts on the photocatalytic activity were also studied. The photoactivity of the prepared transparent titania nanoparticles incorporated in thin poly(hydroxyethyl methacrylate) layers was assessed by the photocatalytic decomposition during irradiation at 365 or 254 nm.