Significantly Enhanced Aqueous Cr(VI) Removal Performance of Bi/ZnO Nanocomposites via Synergistic Effect of Adsorption and SPR-Promoted Visible Light Photoreduction

Bismuth nanoparticles (BiNPs) and Zinc Oxide photocatalysts (BiNPs/ZnO) with different Bi loadings were successfully prepared via a facile chemical method. Their morphology and structure were thoroughly characterized by powder X-ray diffraction (XRD), scanning electron microscopy (SEM), high-resolut...

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Bibliographic Details
Published in:Catalysts 2018-10, Vol.8 (10), p.426
Main Authors: Yuan, Xiaoya, Feng, Zijuan, Zhao, Jianjun, Niu, Jiawei, Liu, Jiasen, Peng, Dong, Cheng, Xin
Format: Article
Language:English
Subjects:
Adsorption
BiNPs/ZnO composite
Bismuth
Catalysts
Chemical reactions
Current carriers
Diffuse reflectance spectroscopy
Electrochemical impedance spectroscopy
Electron microscopy
hexavalent chromium
Light
Light irradiation
Luminous intensity
Morphology
Nanocomposites
Nanoparticles
Organic chemistry
Oxidation
Photocatalysis
Photocatalysts
Photochemistry
Photoelectrons
Photoluminescence
photoreduction
Pollutants
surface plasmonic resonance
Synergistic effect
Ultraviolet reflection
visible light
Wurtzite
X ray photoelectron spectroscopy
X ray powder diffraction
Zinc oxide
Zinc oxides
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Summary:Bismuth nanoparticles (BiNPs) and Zinc Oxide photocatalysts (BiNPs/ZnO) with different Bi loadings were successfully prepared via a facile chemical method. Their morphology and structure were thoroughly characterized by powder X-ray diffraction (XRD), scanning electron microscopy (SEM), high-resolution transmission electron microscopy (HRTEM), X-ray photoelectron spectroscopy (XPS), UV-Vis (Ultraviolet-Visible) diffuse reflectance spectroscopy (DRS), photoluminescence spectra (PL), and electrochemical impedance spectroscopy (EIS). The results showed that a modification of hexagonal wurtzite-phase ZnO nanoparticles with Bi is achievable with an intimate interfacial interaction within its composites. The performance of the photocatalytic Cr(VI) removal under visible light irradiation indicated that BiNPs/ZnO exhibited a superior removal performance to bare ZnO, Bi, and the counterpart sample prepared using a physical mixing method. The excellent performance of the BiNPs/ZnO photocatalysts could be ascribed to the synergistic effect between the considerable physical Cr (VI) adsorption and enhanced absorption intensity in the visible light region, due to the surface plasmon resonance (SPR) as well as the effective transfer and separation of the photogenerated charge carriers at the interface.
ISSN:2073-4344
2073-4344
DOI:10.3390/catal8100426