Defect-rich ZnO nanosheets of high surface area as an efficient visible-light photocatalyst
Defect-rich, high-surface-area ZnO nanosheets coupled with Ag3PO4 nanoparticles for efficient visible-light photocatalysis. [Display omitted] •Ultra-rapid solution synthesis of defect-rich ZnO nanosheets.•Nanosheets with high surface area are rich in surface oxygen-vacancies.•Rich surface oxygen-vac...
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Veröffentlicht in: | Applied catalysis. B, Environmental Environmental, 2016-09, Vol.192, p.8-16 |
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Zusammenfassung: | Defect-rich, high-surface-area ZnO nanosheets coupled with Ag3PO4 nanoparticles for efficient visible-light photocatalysis.
[Display omitted]
•Ultra-rapid solution synthesis of defect-rich ZnO nanosheets.•Nanosheets with high surface area are rich in surface oxygen-vacancies.•Rich surface oxygen-vacancies promote the visible-light photocatalytic activities.•Synergistic effect of defects and Ag3PO4 coupling lead to higher activities.
A facile ultra-rapid solution method was developed to fabricate ZnO nanosheets with tunable BET surface area and rich oxygen-vacancy defects. The addition of 1molL−1 Na2SO4 led to an increase of BET surface area of ZnO nanosheets from 6.7 to 34.5m2/g, through an electrostatic-controlled growth and self-assembly mechanism. Detailed analysis based on Raman scattering, room-temperature photoluminescence, X-ray photoelectron spectroscopy and electron spin resonance revealed that the as-prepared ZnO nanosheets were rich in oxygen-vacancies. Increased BET surface area led to a further increase of surface oxygen-vacancy concentration. The rich oxygen-vacancies promoted the visible-light absorption of the ZnO nanosheets, leading to high photocurrent responses and photocatalytic activities towards the degradation of rhodamine B (apparent rate constants, k=0.0179min−1) under visible-light illumination (λ>420nm), about 13 and 11 times higher, respectively than that of ZnO nanoparticles with few oxygen defects. In addition, the high-surface-area ZnO nanosheets could be effectively hybridized with Ag3PO4 nanoparticles, resulting in a further enhancement of the visible-light photocatalytic performance (k=0.0421min−1). This increase in performance was attributed to the increased visible-light absorption as well as the energy level matching, the latter leading to efficient charge transfer between oxygen-vacancy-rich ZnO nanosheet and Ag3PO4, suggesting a synergistic effect of surface oxygen vacancies and Ag3PO4 coupling. |
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ISSN: | 0926-3373 1873-3883 |
DOI: | 10.1016/j.apcatb.2016.03.040 |