Faktory ovlivňující fotokatalytické vlastnosti materiálů na bázi TiO2 v environmentálně významných reakcích

Abstract

The dissertation thesis deals with the effect of modification of titanium dioxide on photocatalytic properties in two environmentally important reactions, photoacatalytic reduction of carbon dioxide and photocatalytic decomposition of methanol. In total, ten sets of photocatalysts were examined, six in photocatalytic reduction of carbon dioxide and four in photocatalytic decomposition of methanol.Photocatalytic reduction of CO2 was carried out in three geometrically different batch reactors using UVC radiation. For this reaction, titanium dioxide was prepared by various methods and was modified with zirconium, nitrogen, copper (Cu or CuO), platinum and platinum with carbon simultaneously. Photocatalytic decomposition of methanol was carried out in a batch reactor using UVA radiation and under the same reaction conditions. For this reaction, titanium dioxide was prepared by various methods, which was modified with lanthanum, neodymium and lanthanum and fluorine simultaneously. The main factors influencing hydrogen production from photocatalytic decomposition of methanol were oxygen vacancies and surface oxygen in photocatalysts. With increasing oxygen vacancies and decreasing surface oxygen (lattice oxygen and hydroxyl), hydrogen yields increased.