Optimal synthesis of a direct Z-scheme photocatalyst with ultrathin W18O49 nanowires on g-C3N4 nanosheets for solar-driven oxidation reactions.
J Colloid Interface Sci
; 550: 99-109, 2019 Aug 15.
Article
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| MEDLINE
| ID: mdl-31055142
ABSTRACT
Constructing Z-scheme photocatalysts is an effective approach to enhance the conversion efficiency of solar to chemical energy. Herein, W18O49/g-C3N4 heterostructures have been synthesized by growing W18O49 ultrathin nanowires on g-C3N4 nanosheets via a convenient solvothermal process. Various characterizations were performed on the materials to understand the structure-performance relationship. The photocatalytic properties of the W18O49/g-C3N4 heterostructures were evaluated by the two oxidation reactions, phenol degradation and oxidative NC coupling of benzylamines, under a simulated sunlight (360â¯≤â¯â¯λâ¯â¯≤â¯780â¯nm). With tuning the W18O49/g-C3N4 mass ratio, the optimal photocatalyst of W18O49(30)/g-C3N4 containing 30â¯wt% W18O49 nanowires exhibited the highest activity in both the photocatalytic reactions. The generations and contributions of the active species in the photocatalytic reactions were identified by electron spin resonance (ESR) spectra and active-species-eliminating experiments. Accordingly, the photocatalytic mechanism of W18O49/g-C3N4 heterostructures has been expounded based on the direct Z-scheme electron transfer between the two semiconductors as well as the synergistic actions of active sites on W18O49 nanowires and g-C3N4 nanosheets. This work demonstrates a rational paradigm to construct 1D/2D semiconductor heterostructures and provides further insights into Z-scheme photocatalytic mechanism for boosting solar-driven pollutant degradation and organic transformation.
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Colección:
01-internacional
Base de datos:
MEDLINE
Idioma:
En
Revista:
J Colloid Interface Sci
Año:
2019
Tipo del documento:
Article
País de afiliación:
China