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Photocatalytic decomposition of methanol over La/TiO2 materials
K. Kočí, I. Troppová, M. Edelmannová, J. Starostka, L. Matějová, J. Lang, M. Reli, H. Drobná, A. Rokicińska, P. Kuśtrowski, L. Čapek,
Jazyk angličtina Země Německo
Typ dokumentu časopisecké články
NLK
ProQuest Central
od 1997-03-01 do Před 1 rokem
Health & Medicine (ProQuest)
od 1997-03-01 do Před 1 rokem
Public Health Database (ProQuest)
od 1997-03-01 do Před 1 rokem
- MeSH
- chemické látky znečišťující vodu chemie MeSH
- difrakce rentgenového záření MeSH
- fotochemické procesy * MeSH
- fotoelektronová spektroskopie MeSH
- fotolýza MeSH
- katalýza MeSH
- lanthan chemie MeSH
- methanol chemie MeSH
- titan chemie MeSH
- vodík chemie MeSH
- Publikační typ
- časopisecké články MeSH
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 (N2 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.
Citace poskytuje Crossref.org
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