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Photocatalytic decomposition of methanol over La/TiO2 materials
Authors: Koci Kamila | Troppova Ivana | Edelmannova Miroslava | Starostka Jakub | Matejova Lenka | Lang Jaroslav | Reli Martin | Drobná Helena | Rokicinska Anna | Kustrowski Piotr | Čapek Libor
Year: 2018
Type of publication: článek v odborném periodiku
Name of source: Environmental Science and Pollution Research
Publisher name: Springer
Place: Heidelberg
Page from-to: 34818-34825
Titles:
Language Name Abstract Keywords
cze Fotokatalytický rozklad metanolu na La/TiO2 materiálech Lantanem modifikované TiO2 fotokatalyzátory byly zkoumány v rozkladu metanolu ve vodných roztocích. Fotokatalyzátory byly připraveny sol-gel metodou a následně kalcinovány. Struktura, textura a optické vlastnosti připravených materiálů byly korelovány s jejich fotokatalytickou aktivitou. oxidace metanolu; fotokatalýza; struktura; La/TiO2
eng Photocatalytic decomposition of methanol over La/TiO2 materials Lanthanum-modified TiO2 photocatalysts (0.2-1.5 wt% La) were investigated in the methanol decomposition in an aqueous solution. The photocatalysts were prepared by the common sol-gel method followed by calcination. The structural (X-ray diffraction, Raman, X-ray photoelectron spectroscopy), textural (N-2 physisorption), and optical properties (diffuse reflectance spectroscopy, photoelectrochemical measurements) of all synthetized nanomaterials were correlated with photocatalytic activity. Both pure TiO2 and La-doped TiO2 photocatalysts proved higher yields of hydrogen in comparison to photolysis. The photocatalyst with optimal amount of lanthanum (0.2 wt% La) showed almost two times higher amount of hydrogen produced at the same time as in the presence of pure TiO2. The photocatalytic activity increased with both increasing photocurrent response and decreasing amount of lattice and surface O species. It has been shown that both direct and indirect mechanisms of methanol photocatalytic oxidation participate in the production of hydrogen. Both direct and indirect mechanisms take part in the formation of hydrogen. Methanol oxidation; Photocurrent response; Lattice O species; Surface O species; La/TiO2

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