Nd/TiO2 Anatase-Brookite Photocatalysts for Photocatalytic Decomposition of Methanol
| Autor: | Piotr Kuśtrowski, Anna Rokicińska, Martin Reli, Kamila Kočí, Libor Čapek, Lenka Matějová, Miroslava Edelmannová, Ivana Troppová, Helena Drobná, Lada Dubnová |
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| Jazyk: | angličtina |
| Rok vydání: | 2018 |
| Předmět: |
Anatase
Materials science hydrogen production chemistry.chemical_element 02 engineering and technology 010402 general chemistry 01 natural sciences Neodymium law.invention lcsh:Chemistry chemistry.chemical_compound law Specific surface area Crystallization CH3OH photocatalytic decomposition Original Research Hydrogen production TiO2 anatase-brookite Brookite electron-hole separation General Chemistry 021001 nanoscience & nanotechnology 0104 chemical sciences Chemistry chemistry lcsh:QD1-999 visual_art Titanium dioxide Photocatalysis visual_art.visual_art_medium 0210 nano-technology photocatalysis neodymium Nuclear chemistry |
| Zdroj: | Frontiers in Chemistry, Vol 6 (2018) Frontiers in Chemistry |
| ISSN: | 2296-2646 |
| DOI: | 10.3389/fchem.2018.00044/full |
| Popis: | 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. Web of Science 6 art. no. 44 |
| Databáze: | OpenAIRE |
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