Silver-loaded ZnO/ZnFe2O4 mesoporous hollow spheres with enhanced photocatalytic activity for 2,4-dichlorophenol degradation under visible light irradiation

Schematic diagram of charge carrier separation in the photo-exited ZnO/ZnFe2O4/Ag ternary composites. [Display omitted] •Visible-light-driven ZnO/ZnFe2O4/Ag spheres were successfully synthesized.•ZnO/ZnFe2O4/Ag spheres have unique mesoporous hollow structures.•ZnO/ZnFe2O4/Ag spheres exhibit excellen...

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Bibliographic Details
Published in:Materials research bulletin 2018-11, Vol.107, p.339-346
Main Authors: Dai, Peng, Wu, Mingzai, Jiang, Tongtong, Hu, Haibo, Yu, Xinxin, Bai, Zhiman
Format: Article
Language:English
Subjects:
2,4-dichlorophenol
ADSORPTION
DESORPTION
FERRITES
Hollow spheres
IRRADIATION
MAGNETS
MATERIALS SCIENCE
Mesoporous
MORPHOLOGY
NANOSTRUCTURES
PHENOLS
PHOTOCATALYSIS
SCANNING ELECTRON MICROSCOPY
SILVER
SPHERES
TRANSMISSION ELECTRON MICROSCOPY
VISIBLE RADIATION
Visible-light-driven photocatalysis
X-RAY DIFFRACTION
ZINC OXIDES
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Summary:Schematic diagram of charge carrier separation in the photo-exited ZnO/ZnFe2O4/Ag ternary composites. [Display omitted] •Visible-light-driven ZnO/ZnFe2O4/Ag spheres were successfully synthesized.•ZnO/ZnFe2O4/Ag spheres have unique mesoporous hollow structures.•ZnO/ZnFe2O4/Ag spheres exhibit excellent photodegradation of 2,4-dichlorophenol.•ZnO/ZnFe2O4/Ag spheres are reusable with the aid of a magnet. Silver-loaded ZnO/ZnFe2O4 (ZnO/ZnFe2O4/Ag) mesoporous hollow spheres were synthesized via a layer-by-layer technique followed chemical reduction method. The structures and morphologies of the as-prepared catalysts were characterized by X-ray diffraction, scanning electron microscope, transmission electron microscope and N2 adsorption/desorption porosimetry. The photodegradation activities of ZnO/ZnFe2O4/Ag mesoporous hollow spheres toward 2,4-dichlorophenol were investigated under UV and visible light irradiation. The experimental results indicated that our mesoporous hollow spheres exhibited much higher photodegradation activities than P25 for the loading of silver particles, the bands matching and the unique structures. There exists an optimal loading dosage of silver particles. Too high or too low loading will reduce the photodegradation activities of ZnO/ZnFe2O4/Ag mesoporous hollow spheres. The possible mechanism behind was proposed. Noteworthily, the ZnO/ZnFe2O4/Ag mesoporous hollow spheres are reusable with the aid of a magnet, which is cost effective.
ISSN:0025-5408
1873-4227
DOI:10.1016/j.materresbull.2018.07.014