Facile fabrication of direct solid-state Z-scheme g-C3N4/Fe2O3 heterojunction: a cost-effective photocatalyst with high efficiency for the degradation of aqueous organic pollutants.
Dalton Trans
; 47(43): 15382-15390, 2018 Nov 21.
Article
em En
| MEDLINE
| ID: mdl-30303508
ABSTRACT
Graphitic carbon nitride (g-C3N4) is a low cost photocatalyst for the visible light-driven degradation of aqueous organic pollutants. Nevertheless, the fast recombination of electron-hole pairs significantly inhibits its photocatalytic activity. Consequently, we report a novel strategy in which the low cost α-Fe2O3 photocatalyst is in situ introduced to accelerate the photogenerated charge separation of g-C3N4 based on a Z-scheme mechanism. Under the irradiation of visible light, the photocatalytic activity significantly improved on coupling g-C3N4 and α-Fe2O3, and a peak Rhodamine B (RhB) degradation efficiency of over 99% were observed. This value is significantly higher than that over pure g-C3N4 (ca. 67%) and α-Fe2O3 (ca. 6%). Additionally, the as-prepared g-C3N4/Fe2O3 exhibits highly stable photocatalytic activity. The loading of α-Fe2O3 on the g-C3N4 surface results in the formation of a direct solid-state Z-scheme structure. The improved separation of electron-hole pairs and strong redox ability of the charge carriers are responsible for the improved photocatalytic activity of g-C3N4/Fe2O3. Finally, the h+ and ËO2- radicals are confirmed as the major oxidation species and a possible photocatalytic mechanism is proposed in the g-C3N4/Fe2O3 reaction system. This work is of significance to promote the large-scale application of g-C3N4-based photocatalysts in water purification.
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Temas:
ECOS
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Financiamentos_gastos
Bases de dados:
MEDLINE
Tipo de estudo:
Health_economic_evaluation
Idioma:
En
Revista:
Dalton Trans
Assunto da revista:
QUIMICA
Ano de publicação:
2018
Tipo de documento:
Article