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Acta Physico-Chimica Sinca  2016, Vol. 32 Issue (8): 2069-2076    DOI: 10.3866/PKU.WHXB201604224
ARTICLE     
Photogenerated Charge-Transfer Properties of Au-Loaded ZnO Hollow Sphere Composite Materials with Enhanced Photocatalytic Activity
Fei ZHAO,Lin-Qi SHI,Jia-Bao CUI,Yan-Hong LIN*()
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Abstract  

Au/ZnO hollow spheres with different mass ratios were synthesized by a simple two-step method. Scanning electron microscopy (SEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and ultraviolet-visible diffuse reflectance spectroscopy (UV-Vis DRS) were used to characterize the as-prepared Au/ZnO hollow spheres. The photocatalytic activity of the Au/ZnO composites was evaluated by the degradation of rhodamine B (RhB) dye under white light. Compared with pure ZnO hollow spheres, the degradation rate of RhB was enhanced by 73%with the appropriate amount of Au in the modified ZnO photocatalysts. The influence of Au decoration on the surface photo-induced charge-transfer behaviour of ZnO was investigated by surface photovoltage spectroscopy (SPS) and transient photovoltage (TPV). The results showed that the improved photodegradation by Au/ZnO hollow spheres was mostly caused by the strong electronic interactions between ZnO and the Au nanoparticles. The appropriate load of Au nanoparticles in ZnO promoted the separation of photogenerated charges, thus extending the transmission time of the charge carrier and increasing the lifetime of the photogenerated charges, resulting in highly efficient photocatalysis.



Key wordsZnO hollow sphere      Noble metal load      Photogenerated charge behavior      Photocatalysis     
Received: 20 January 2016      Published: 22 April 2016
MSC2000:  O643  
Fund:  the National Natural Science Foundation of China(51572106);the National Natural Science Foundation of China(21173103);the National Natural Science Foundation of China(51172090)
Corresponding Authors: Yan-Hong LIN     E-mail: linyh@jlu.edu.cn
Cite this article:

Fei ZHAO,Lin-Qi SHI,Jia-Bao CUI,Yan-Hong LIN. Photogenerated Charge-Transfer Properties of Au-Loaded ZnO Hollow Sphere Composite Materials with Enhanced Photocatalytic Activity. Acta Physico-Chimica Sinca, 2016, 32(8): 2069-2076.

URL:

http://www.whxb.pku.edu.cn/10.3866/PKU.WHXB201604224     OR     http://www.whxb.pku.edu.cn/Y2016/V32/I8/2069

Fig 1 Power XRD patterns of the as-prepared pure ZnO and Au/ZnO samples Peaks marked by (*) are indexed to the fcc Au.
Fig 2 SEM images of pure ZnO hollow spheres (a, b, c) and 0.5% (w) (d), 1.5% (e), 2.5% (f) Au/ZnO samples
Fig 3  TEM image of 1.5% (w) Au/ZnO sample Inset is the HRTEM image of the selected area.
Fig 4 Typical nitrogen adsorption-desorption isotherm curves of ZnO hollow spheres
Fig 5 XPS spectra of 1.5% (w) Au/ZnO
Fig 6 UV-Vis DRS spectra of the as-prepared ZnO and Au/ZnO hollow sphere photocatalysts
Fig 7 SPS of the as-prepared ZnO and Au/ZnO hollow sphere photocatalysts
Fig 8 TPV spectra of the as-prepared ZnO and Au/ZnO hollow sphere photocatalysts under ultraviolet light The samples excited with a laser radiation pulse with a power of 50μJ, wavelength of 355 nm and pulse width of 5 ns.
Fig 9 Kinetics curves of photodegradation of RhB using the as-prepared ZnO and Au/ZnO hollow spheres under white light (UV + visible light)
Fig 10 Kinetics curves of photodegradation of RhB using 1.5% (w) Au/ZnO hollow spheres under white light and visible light (λ > 420 nm)
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