Fotokatalytická generace vodíku z roztoku voda-metanol v přítomnosti vermikulitů

Abstract

The thesis deals with photocatalytic hydrogen generation from water-methanol solution in the presence of vermiculites. Hydrogen production, as one of the main candidates for future energy fuels, was ensured by photocatalytic water splitting processes, which were enhanced for higher efficiency by the presence of a sacrificial agent, which was methanol. Vermiculite heat treated at 500 and 700 °C was used as a substrate for the precipitation of hematite (α-Fe2O3) nanoparticles in α Fe2O3/vermiculite composites, which were used as photocatalyst. The prepared photocatalysts were characterized by X-ray fluorescence spectroscopy, X-ray diffraction analysis and nitrogen physisorption. The photocatalytic hydrogen generation was carried out in a seeded photoreactor in the presence of the prepared nanocomposites for 4 hours. A UV lamp with a wavelength of 254 nm was used as the radiation source. The photocatalytic activity of the samples was correlated with their physicochemical properties. The highest hydrogen yields were achieved in the presence of the Fe/V–700 photocatalyst, which had the largest specific surface area and the largest crystallite size.