Surface oxygen vacancy induced solar light activity enhancement of a CdWO 4 /Bi 2 O 2 CO 3 core-shell heterostructure photocatalyst
A CdWO /Bi O CO core-shell heterostructure photocatalyst was fabricated via a facile two-step hydrothermal process. Flower-like Bi O CO was synthesized and functioned as the cores on which CdWO nanorods were coated as the shells. Photoluminescence (PL) spectra and electron paramagnetic resonance (EP...
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Published in | Physical chemistry chemical physics : PCCP Vol. 19; no. 22; pp. 14431 - 14441 |
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Main Authors | , , , , , , , |
Format | Journal Article |
Language | English |
Published |
England
07.06.2017
|
Online Access | Get full text |
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Summary: | A CdWO
/Bi
O
CO
core-shell heterostructure photocatalyst was fabricated via a facile two-step hydrothermal process. Flower-like Bi
O
CO
was synthesized and functioned as the cores on which CdWO
nanorods were coated as the shells. Photoluminescence (PL) spectra and electron paramagnetic resonance (EPR) demonstrate that the CdWO
/Bi
O
CO
core-shell heterostructure photocatalyst possesses a large amount of oxygen vacancies, which induce defect levels in the band gap and help to broaden light absorption. The photocatalyst exhibits enhanced photocatalytic activity for Rhodamine B (RhB), methylene blue (MB), methyl orange (MO), and colorless contaminant phenol degradation under solar light irradiation. The heterostructured CdWO
/Bi
O
CO
core-shell photocatalyst shows drastically enhanced photocatalytic properties compared to the pure CdWO
and Bi
O
CO
. This remarkable enhancement is attributed to the following three factors: (1) the presence of oxygen vacancies induces defect levels in the band gap and increases the visible light absorption; (2) intimate interfacial interactions derived from the core-shell heterostructure; and (3) the formation of the n-n junction between the CdWO
and Bi
O
CO
. The mechanism is further explored by analyzing its heterostructure and determining the role of active radicals. The construction of high-performance photocatalysts with oxygen vacancies and core-shell heterostructures has great potential for degradation of refractory contaminants in water with solar light irradiation. |
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ISSN: | 1463-9076 1463-9084 |
DOI: | 10.1039/C7CP02136D |