Hierarchical TiO2 nanoflakes and nanoparticles hybrid structure for improved photocatalytic activity

Three-dimensional TiO2 microspheres with different hierarchical nanostructures were synthesized by the synergistic strategies of ultrafast electrochemical spark discharge spallation process followed by thermal treatment. The morphology, crystal structure, surface area, and photocatalytic activity of...

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Main Authors: Tang, Yuxin, Wee, Peixin, Lai, Yuekun, Wang, Xiaoping, Gong, Dangguo, Kanhere, Pushkar D., Lim, Teik-Thye, Dong, Zhili, Chen, Zhong
Other Authors: School of Civil and Environmental Engineering
Format: Article
Language:English
Published: 2013
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Online Access:https://hdl.handle.net/10356/99185
http://hdl.handle.net/10220/17176
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Institution: Nanyang Technological University
Language: English
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spelling sg-ntu-dr.10356-991852020-06-01T10:13:40Z Hierarchical TiO2 nanoflakes and nanoparticles hybrid structure for improved photocatalytic activity Tang, Yuxin Wee, Peixin Lai, Yuekun Wang, Xiaoping Gong, Dangguo Kanhere, Pushkar D. Lim, Teik-Thye Dong, Zhili Chen, Zhong School of Civil and Environmental Engineering School of Materials Science & Engineering DRNTU::Engineering::Materials::Nanostructured materials Three-dimensional TiO2 microspheres with different hierarchical nanostructures were synthesized by the synergistic strategies of ultrafast electrochemical spark discharge spallation process followed by thermal treatment. The morphology, crystal structure, surface area, and photocatalytic activity of the hierarchical nanostructures were characterized by scanning electron microscopy, transmission electron microscopy, X-ray diffraction, surface area analysis, and UV–vis spectroscopy respectively. The nanostructure of hierarchical microspheres undergoes three evolution steps, which includes the change from nanosheets into hybrid nanoflakes/nanoparticles and finally to nanoparticles as calcination temperature increases, in line with the predicable trend of increase in crystallinity and decrease in specific surface area. Compared to other forms of calcined TiO2 samples (nanosheets and nanoparticles), the hybrid TiO2 nanoflake/nanoparticle hierarchical porous structure exhibits a higher photocatalytic activity for the degradation of organic compounds (methyl orange and bisphenol A). This is attributed to their larger specific surface area (116 m2/g), more abundant porosity, and good crystallinity. On the basis of this hybrid structure, a visible light sensitive Ag/TiO2 microsphere photocatalyst is designed which shows faster degradation rate under the visible light illumination (>420 nm). The porous microspheric photocatalyst does not lose its activities after recycled use, showing great potential for practical application in environmental cleanup. 2013-10-31T08:46:04Z 2019-12-06T20:04:13Z 2013-10-31T08:46:04Z 2019-12-06T20:04:13Z 2012 2012 Journal Article Tang, Y., Wee, P., Lai, Y., Wang, X., Gong, D., Kandere, P. D., et al. (2012). Hierarchical TiO2 nanoflakes and nanoparticles hybrid structure for improved photocatalytic activity. The Journal of Physical Chemistry C, 116(4), 2772-2780. https://hdl.handle.net/10356/99185 http://hdl.handle.net/10220/17176 10.1021/jp210479a en The journal of physical chemistry C
institution Nanyang Technological University
building NTU Library
country Singapore
collection DR-NTU
language English
topic DRNTU::Engineering::Materials::Nanostructured materials
spellingShingle DRNTU::Engineering::Materials::Nanostructured materials
Tang, Yuxin
Wee, Peixin
Lai, Yuekun
Wang, Xiaoping
Gong, Dangguo
Kanhere, Pushkar D.
Lim, Teik-Thye
Dong, Zhili
Chen, Zhong
Hierarchical TiO2 nanoflakes and nanoparticles hybrid structure for improved photocatalytic activity
description Three-dimensional TiO2 microspheres with different hierarchical nanostructures were synthesized by the synergistic strategies of ultrafast electrochemical spark discharge spallation process followed by thermal treatment. The morphology, crystal structure, surface area, and photocatalytic activity of the hierarchical nanostructures were characterized by scanning electron microscopy, transmission electron microscopy, X-ray diffraction, surface area analysis, and UV–vis spectroscopy respectively. The nanostructure of hierarchical microspheres undergoes three evolution steps, which includes the change from nanosheets into hybrid nanoflakes/nanoparticles and finally to nanoparticles as calcination temperature increases, in line with the predicable trend of increase in crystallinity and decrease in specific surface area. Compared to other forms of calcined TiO2 samples (nanosheets and nanoparticles), the hybrid TiO2 nanoflake/nanoparticle hierarchical porous structure exhibits a higher photocatalytic activity for the degradation of organic compounds (methyl orange and bisphenol A). This is attributed to their larger specific surface area (116 m2/g), more abundant porosity, and good crystallinity. On the basis of this hybrid structure, a visible light sensitive Ag/TiO2 microsphere photocatalyst is designed which shows faster degradation rate under the visible light illumination (>420 nm). The porous microspheric photocatalyst does not lose its activities after recycled use, showing great potential for practical application in environmental cleanup.
author2 School of Civil and Environmental Engineering
author_facet School of Civil and Environmental Engineering
Tang, Yuxin
Wee, Peixin
Lai, Yuekun
Wang, Xiaoping
Gong, Dangguo
Kanhere, Pushkar D.
Lim, Teik-Thye
Dong, Zhili
Chen, Zhong
format Article
author Tang, Yuxin
Wee, Peixin
Lai, Yuekun
Wang, Xiaoping
Gong, Dangguo
Kanhere, Pushkar D.
Lim, Teik-Thye
Dong, Zhili
Chen, Zhong
author_sort Tang, Yuxin
title Hierarchical TiO2 nanoflakes and nanoparticles hybrid structure for improved photocatalytic activity
title_short Hierarchical TiO2 nanoflakes and nanoparticles hybrid structure for improved photocatalytic activity
title_full Hierarchical TiO2 nanoflakes and nanoparticles hybrid structure for improved photocatalytic activity
title_fullStr Hierarchical TiO2 nanoflakes and nanoparticles hybrid structure for improved photocatalytic activity
title_full_unstemmed Hierarchical TiO2 nanoflakes and nanoparticles hybrid structure for improved photocatalytic activity
title_sort hierarchical tio2 nanoflakes and nanoparticles hybrid structure for improved photocatalytic activity
publishDate 2013
url https://hdl.handle.net/10356/99185
http://hdl.handle.net/10220/17176
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