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Nd/TiO2 Anatase-Brookite Photocatalysts for Photocatalytic Decomposition of Methanol
Authors: Koci Kamila | Troppova Ivana | Reli Martin | Matejova Lenka | Edelmannova Miroslava | Drobná Helena | Dubnová Lada | Rokicinska Anna | Kustrowski Piotr | Čapek Libor
Year: 2018
Type of publication: článek v odborném periodiku
Name of source: Frontiers in chemistry
Publisher name: FRONTIERS MEDIA SA
Place: Lausanne
Page from-to: "44-1"-"44-11"
Titles:
Language Name Abstract Keywords
cze Nd/TiO2 anatas-brookit fotokatalyzátory pro fotokatalytický rozklad metanolu Prášky na bázi anatasu a brookitu opbohacené o neodym byly připraveny nekonvenční metodou pomocí stlačené horké tekutiny, zakrystalizovány a vyčištěny. Připravené fotokatalyzátory byly testovány pro fotokatalytický rozklad metanolu a charakterizovány z hlediska textury, struktury, optických, chemických a fotoelektrochemických vlastností. Nd; TiO2; anatas; brookit; fotokatalytický rozklad; metanol
eng Nd/TiO2 Anatase-Brookite Photocatalysts for Photocatalytic Decomposition of Methanol Neodymium enriched TiO2 anatase-brookite powders were prepared by unconventional method via using pressurized hot fluids for TiO2 crystallization and purification. The photocatalysts were tested in the CH3OH photocatalytic decomposition and they were characterized with respect to the textural (nitrogen adsorption), structural (XRD, XPS, and Raman spectroscopies), chemical (XRF), and optical (DR UV-Vis spectroscopy) and photoelectrochemical measurement. All prepared materials were nanocrystalline, had biphasic (anatase-brookite) structure and relatively large specific surface area (125 m(2). g(-1)). The research work indicates that the doping of neodymium on TiO2 photocatalysts significantly enhances the efficiency of photocatalytic reaction. The photocatalytic activity increased with increasing portion of hydroxyl oxygen to the total amount of oxygen species. It was ascertained that the optimal amount of 1 wt% Nd in TiO2 accomplished the increasing of hydrogen production by 70% in comparison with pure TiO2. The neodymium doped on the titanium dioxide act as sites with accumulation of electrons. The higher efficiency of photocatalytic process was achieved due to improved electron-hole separation on the modified TiO2 photocatalysts. This result was confirmed by electrochemical measurements, the most active photocatalysts proved the highest photocurrent responses. neodymium; TiO2 anatase-brookite; CH3OH photocatalytic decomposition; hydrogen production; photocatalysis; electron-hole separation

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