In this paper, samples containing gold nanoparticles (NPs) distributed in different optically transparent media have been synthesized and characterized. A liquid (aqueous) and a solid (porous silicate glass and polymer (polyvinylpyrrolidone)) media were used. The samples obtained were characterized by optical spectroscopy and electron microscopy. The position of plasmon resonance band was analyzed depending on the dielectric constant of the medium.

Keywords: gold nanoparticles, colloidal solution, polymer, porous glass

In the present work, a study was made of the properties of a photocatalyst-adsorbent based on metal oxide, which was titanium dioxide (TiO2). The photodegradation activity of two organic dyes under the action of light was analyzed. The effect of the phase composition of the photocatalyst was compared on the example of three modifications of TiO2 - rutile, anatase and their mixture.

Keywords: TiO2, photocatalysis, metal oxide, dyes

Article describes the method for preparation of a metal-organic framework (MOF)-based composite containing magnetic particles. Analysis of its physical and chemical properties was carried out, and the electrocatalytic activity of the composite in oxygen reduction reaction was estimated.

Keywords: magnetic particles, metal-organic frameworks, platinum-free catalysts, fuel cells, oxygen reduction reaction