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Enhanced photocatalytic activity of octahedral anatase particles prepared by hydrothermal reaction

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Title: Enhanced photocatalytic activity of octahedral anatase particles prepared by hydrothermal reaction
Authors: Wei, Z. Browse this author
Kowalska, E. Browse this author →ORCID
Wang, K. Browse this author
Colbeau-Justin, C. Browse this author
Ohtani, Bunsho Browse this author →KAKEN DB
Keywords: Anatase
Morphology
OAPs
Octahedral particles
Photocatalytic activity
Platinum nanoparticles
Issue Date: 1-Feb-2017
Publisher: Elsevier
Journal Title: Catalysis today
Volume: 280
Start Page: 29
End Page: 36
Publisher DOI: 10.1016/j.cattod.2016.04.028
Abstract: Octahedral anatase particles (OAPs) were prepared by hydrothermal reaction (HT) with various experimental conditions, including different amounts of titanate nanowires (TNWs), different water volumes and different pH values, to obtain products with high contents of OAPs. The properties of photocatalysts were investigated by XRD, SEM, TEM, XPS and time-resolved microwave conductivity (TRMC). Photocatalytic activities for oxidative decomposition of acetic acid (CO2 system) and anaerobic dehydrogenation of methanol (H-2 system) were tested. It was found that a larger amount and concentration of TNWs, as well as higher pressure during HT, resulted in the formation of smaller crystallites with higher density of mobile electrons. Enhanced photocatalytic activity, achieved for samples with the best morphology (higher content of OAPs), correlated with slower TRMC signal decay, i.e., slower recombination of charge carriers (e(-)/h(+)) probably due to lower content of deep electron traps. It was found that properties of platinum nanoparticles, deposited in-situ in the H-2 system in the absence or presence of pre-sparged oxygen, and their connection with OAPs were decisive factors for photocatalytic activity.
Rights: © 2016. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/
http://creativecommons.org/licenses/by-nc-nd/4.0/
Type: article (author version)
URI: http://hdl.handle.net/2115/72447
Appears in Collections:触媒科学研究所 (Institute for Catalysis) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: Ewa Kowalska

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