Synergistic effect of Fe2O3 and CeO2 co-modified titanate nanosheet heterojunction on enhanced photocatalytic degradation

CeO 2 and Fe 2 O 3 co-modified titanate nanosheet (Fe 2 O 3 /CeO 2 @TNS) was prepared by one-pot hydrothermal method; the photocatalyst exhibited large surface area with CeO 2 and Fe 2 O 3 particles well dispersed on the surface. The results of XRD, BET, and Raman proved that the CeO 2 and Fe 2 O 3...

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Published in:Journal of nanoparticle research : an interdisciplinary forum for nanoscale science and technology 2017-09, Vol.19 (9), p.1, Article 325
Main Authors: Zhao, Xiaona, Wu, Pei, Lu, Dingze, Fang, Pengfei, Liu, Min, Qian, Zhouhai
Format: Article
Language:English
Subjects:
Catalytic activity
Cerium oxides
Characterization and Evaluation of Materials
Chemistry and Materials Science
Degradation
Energy conversion
Environmental cleanup
Hematite
Inorganic Chemistry
Iron oxides
Lasers
Materials Science
Nanoparticles
Nanosheets
Nanotechnology
Optical Devices
Optics
Phenols
Photocatalysis
Photodegradation
Photonics
Physical Chemistry
Research Paper
Synergistic effect
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Summary:CeO 2 and Fe 2 O 3 co-modified titanate nanosheet (Fe 2 O 3 /CeO 2 @TNS) was prepared by one-pot hydrothermal method; the photocatalyst exhibited large surface area with CeO 2 and Fe 2 O 3 particles well dispersed on the surface. The results of XRD, BET, and Raman proved that the CeO 2 and Fe 2 O 3 introduced in the TNS influenced its structure evolution from 3D to 2D. The modification resulted in a shift of the absorption edge toward a longer wavelength and the band gap reduced to 2.87 eV. The three-component systems performed excellent photocatalytic activity and cycle stability on phenol and methyl blue (MB) solution under sunlight; nearly total phenol and MB were degraded in dozens of minutes. And the reaction rate constant ( K ) of Fe 2 O 3 /CeO 2 @TNS on phenol degradation was 1.77, 3.25, 4.88, and 13-fold of Fe 2 O 3 @TNS, CeO 2 @TNS, bare TNS, and P25, respectively. The enhanced photocatalytic activity could be ascribed to the efficient separation of photogenerated pairs through the formation of tandem n-n-n heterojunction among the three-component systems. This work will be useful for the design of other tandem n-n-n heterojunction photocatalytic systems for application in energy conversion and environmental remediation. Graphical abstract ᅟ
ISSN:1388-0764
1572-896X
DOI:10.1007/s11051-017-4013-5