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Mechanism of formation, structural characteristics and photocatalytic activities of hierarchical-structured bismuth-tungstate particles

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Title: Mechanism of formation, structural characteristics and photocatalytic activities of hierarchical-structured bismuth-tungstate particles
Authors: Hori, H. Browse this author
Takase, M. Browse this author
Takashima, M. Browse this author
Amano, F. Browse this author
Shibayama, T. Browse this author
Ohtani, B. Browse this author →KAKEN DB
Keywords: Hierarchical flake-ball structure
Hollow particle
Bismuth oxyhydroxide
Core-shell-structured droplet
Reaction at the boundarya
Issue Date: 1-Feb-2018
Publisher: Elsevier
Journal Title: Catalysis today
Volume: 300
Start Page: 99
End Page: 111
Publisher DOI: 10.1016/j.cattod.2017.03.002
Abstract: The mechanism of the formation of flake ball-shaped (FB) bismuth-tungstate (BWO) particles was studied with samples prepared by hydrothermal reactions under standard conditions (tungsten/bismuth ratio of 0.55 in feed; 433 K; 20 h) and other modified conditions, and the structural characteristics of the samples were analyzed by powder X-ray diffraction (composition and crystal structure), field emission-type scanning electron microscopy (FE-SEM) (morphology), focused ion-beam etching followed by FE-SEM (inner void structure), ultrahigh-voltage transmission electron microscopy (inner void structure) and low-voltage scanning electron microscopy with energy-dispersive X-ray spectroscopic analysis (morphology and elemental distribution). Based on the results, a novel two-step mechanism of (1) formation of aqueous bismuth-oxyhydroxide droplets covered by tungstic acid (BOx@HWO) with fluidity and (2) reaction of inner bismuth and outer tungsten components at the BOx@HWO surface to yield BWO flakes is proposed as a one of the most plausible pathways that are consistent with the hollow structure of FB BWO and observations of the products prepared with shorter hydrothermal reaction. Photocatalytic activities of FB BWO samples in relation to their structure were studied.
Rights: © 2018. 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/2115/76672
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: 大谷 文章

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