Synergistic effects of morphology control and calcination on the activity of flower-like Bi2WO6-Bi2O3 photocatalysts prepared by an ionic liquid-assisted solvothermal method

•Flower-like Bi2O3/Bi2WO6 was prepared by ionic liquid-solvothermal method and calcination.•Effects of ionic liquids and calcination on morphology and activity of photocatalysts were studied.•Incorporating ionic liquid leads to larger microflowers with more petal sheets.•The H2 production activity o...

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Bibliographic Details
Published in:Journal of alloys and compounds 2021-11, Vol.883, p.160920, Article 160920
Main Authors: Chao, Pei-Yao, Chang, Chi-Jung, Lin, Kuen-Song, Wang, Chih‑Feng
Format: Article
Language:English
Subjects:
Bi2O3
Bi2WO6
Bismuth compounds
Bismuth oxides
Bismuth trioxide
Calcination
Current carriers
Electromagnetic absorption
H2 production
Hydrogen production
Ionic liquid
Ionic liquids
Ions
Microspheres
Morphology
Photocatalysis
Photocatalyst
Photocatalysts
Roasting
Surface matching
Synergistic effect
Tungstates
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Summary:•Flower-like Bi2O3/Bi2WO6 was prepared by ionic liquid-solvothermal method and calcination.•Effects of ionic liquids and calcination on morphology and activity of photocatalysts were studied.•Incorporating ionic liquid leads to larger microflowers with more petal sheets.•The H2 production activity of Bi2O3/Bi2WO6 photocatalyst was studied for the first time.•The improved activity was due to p-n junction, increased surface area, and light absorption. [Display omitted] A flower-like Bi2WO6-Bi2O3 photocatalyst was prepared by a two-step process, including an ionic liquid-assisted solvothermal step and calcination. The effects of the ionic liquids and calcination on the morphology, property, and photocatalytic performance of Bi2WO6-based photocatalysts were studied. The addition of ionic liquids during the preparation of Bi2WO6 based-materials lead to increased sizes of photocatalysts and the formation of more petal sheets in the flower-like microspheres. The results of XRD, XPS, and TEM confirm that Bi2WO6-Bi2O3 photocatalysts formed after the calcination treatment of Bi2WO6 photocatalyst in an air atmosphere. The Bi2WO6-Bi2O3 flower-like photocatalyst exhibits better photocatalytic H2 production activity than the Bi2WO6 photocatalyst. The improved activity of the Bi2WO6-Bi2O3 photocatalysts was attributed to their enhanced light absorption, increased surface area, matched band structure, and the inhibited recombination of the photogenerated charge carriers.
ISSN:0925-8388
1873-4669
DOI:10.1016/j.jallcom.2021.160920