Photocatalytic Properties of Tin Dioxide Doped with Chromium(III), Silver and Zinc Compounds in the Oxidation of Organic Substrates by the Action of Visible Light

Structure and Photocatalytic Properties of SnO2 Doped with Titanium

“…Initial precipitated sample has composition closed to oxy-hydroxide SnO(OH) 2 that is confirmed by DTA-TG data [12,15]. According to the results of XRD analysis, it has a low crystalline structure, but the doped and calcined samples have a more perfect crystal structure.…”

“…Thus, the band gap E g are 3.2 and 3.3 eV for undoped SnO 2 calcined at 300C and 550C, respectively. This is associated with transformation of tin oxy-hydroxide to tin dioxide [12,18]. At the same time, E g are 2.8, 2.9 and 2.7 eV for SnO 2 samples doped with Ti 4+ and calcined at 300 and 550C, respectively.…”

“…2 and 3). Photocatalytic properties of semiconductors depend on their electronic characteristics, crystal and porous structure, specific surface area and degree of surface hydroxylation, and, therefore, adsorption capacity towards the substrate as well as impurities and structure defects presence [1, [10][11][12]. However, these factors may affect in different directions.…”

“…Coprecipitation, sol-gel methods are most often used for preparation of such compositions. At the same time, ultrasound (UST) based on solid dispersion processes is the effective but little explored technique for doping the oxides [12].…”

Cation-containing active carbons as photocatalysts for dyes degradation

“…The activity of AC Ox-Cu and AC Ox-Co catalysts under visible illumination can be associated with formation of additional levels in band gap of carbon as it occurs due to the doping of oxides with metals [35,41] or narrowing of band gap. The latter was observed by authors of work [19,21] as a result of introduction of heteroatoms and defects into carbon structure.…”