Bi2WO6/UiO-NH2-66 heterojunction photocatalysts with enhanced visible light organic pollutants removal

In this work, the flower-like hierarchical Bi 2 WO 6 decorated with nano UiO-NH 2 -66 was fabricated by a two-step solvothermal method. The structure, composition, and morphology of the composites were characterized by XRD, FTIR, XPS, BET, and SEM. The photoelectrochemical properties of the composit...

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Bibliographic Details
Published inJournal of materials research Vol. 37; no. 21; pp. 3761 - 3772
Main Authors Chen, Junnan, Lin, Wensong, Mai, Xin, Yang, Qian
Format Journal Article
LanguageEnglish
Published Cham Springer International Publishing 14.11.2022
Springer Nature B.V
Subjects
Applied and Technical Physics
Biomaterials
Bismuth compounds
Chemistry and Materials Science
Composite materials
Electron paramagnetic resonance
Electron spin
Free radicals
Heterojunctions
Hydroxyl radicals
Inorganic Chemistry
Materials Engineering
Materials research
Materials Science
Nanotechnology
Organic matter
Photocatalysts
Photoelectric effect
Pollutants
Rhodamine
Spin resonance
Trapping
Tungstates
X ray photoelectron spectroscopy
66
Bismuth tungstate
UiO-NH
Photocatalytic performance
Heterojunction
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Summary:In this work, the flower-like hierarchical Bi 2 WO 6 decorated with nano UiO-NH 2 -66 was fabricated by a two-step solvothermal method. The structure, composition, and morphology of the composites were characterized by XRD, FTIR, XPS, BET, and SEM. The photoelectrochemical properties of the composites were analyzed by transient photocurrent response, DRS, and PL spectra. It is found that hole (·h + ) plays a dominant role, and the hydroxyl radical (·OH) and superoxide radical (·O 2 − ) play a secondary role in the catalytic system after free radical trapping experiments. The results of electron spin resonance spin-trapping tests also confirm the mechanism. Compared with pure Bi 2 WO 6 or pure UiO-NH 2 -66, Bi 2 WO 6 /UiO-NH 2 -66 composites have much higher decomposition effectiveness of Rhodamine B under the same conditions. Furthermore, Bi 2 WO 6 /UiO-NH 2 -66 photocatalyst with 7 wt% of UiO-NH 2 -66 (denoted as BWO/UNH-7) kept the stable catalytic performance after five recycles, which may be used as a good photocatalyst for degrading organic matter in sewage. Graphical abstract
ISSN:0884-2914
2044-5326
DOI:10.1557/s43578-022-00749-1