In situ assembly of CQDs/Bi2WO6 for highly efficient photocatalytic degradation of VOCs under visible light

A series of carbon quantum dot (CQD)/Bi2WO6 hybrid materials were synthesized via a facile in situ hydrothermal method, where the CQDs were prepared using different carbon sources. As demonstrated by multiple techniques, including XRD, SEM, TEM, XPS, BET, UV-vis, FT-IR, PL and TPR, the visible light...

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Bibliographic Details
Published inNew journal of chemistry Vol. 44; no. 8; pp. 3455 - 3462
Main Authors Liu, Yangqing, Zhu, Changjun, Sun, Jingwen, Ge, Yan, Song, Fujiao, Xu, Qi
Format Journal Article
LanguageEnglish
Published Cambridge Royal Society of Chemistry 28.02.2020
Subjects
Bismuth compounds
Carbon
Chitosan
Electromagnetic absorption
Light irradiation
Optical properties
Oxidation
Photocatalysis
Photodegradation
Quantum dots
Toluene
Tungstates
X ray photoelectron spectroscopy
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Summary:A series of carbon quantum dot (CQD)/Bi2WO6 hybrid materials were synthesized via a facile in situ hydrothermal method, where the CQDs were prepared using different carbon sources. As demonstrated by multiple techniques, including XRD, SEM, TEM, XPS, BET, UV-vis, FT-IR, PL and TPR, the visible light absorption wavelength red-shifted, the oxidation ability was enhanced, and the recombination probability of electron–hole pairs was inhibited by incorporating the CQDs in Bi2WO6. Moreover, different carbon source-derived CQD/Bi2WO6 materials exhibited different optical and electronic properties. The CQD/Bi2WO6 materials exhibited excellent activity in the photocatalytic degradation of VOCs under visible light irradiation, among which the CQDs/Bi2WO6 derived from chitosan demonstrated the best activity with 96.9% degradation for gaseous toluene and 97.1% for gaseous formaldehyde within only 120 min. Furthermore, the CQDs/Bi2WO6 showed high stability and reusability.
ISSN:1144-0546
1369-9261
DOI:10.1039/c9nj04957f