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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)
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Submitter: 大谷 文章
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