Photocatalytic decomposition of methanol over La/TiO2 materials

被引:0
|
作者
Kamila Kočí
Ivana Troppová
Miroslava Edelmannová
Jakub Starostka
Lenka Matějová
Jaroslav Lang
Martin Reli
Helena Drobná
Anna Rokicińska
Piotr Kuśtrowski
Libor Čapek
机构
[1] VŠB-Technical University of Ostrava,Institute of Environmental Technology
[2] VŠB-Technical University of Ostrava,Faculty of Metallurgy and Material Engineering
[3] University of Pardubice,Faculty of Chemical Technology
[4] Jagiellonian University,Faculty of Chemistry
来源
Environmental Science and Pollution Research | 2018年 / 25卷
关键词
Methanol oxidation; Photocurrent response; Lattice O species; Surface O species; La/TiO;
D O I
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中图分类号
学科分类号
摘要
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.
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页码:34818 / 34825
页数:7
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