Photocatalytic and Adsorption Performances of Faceted Cuprous Oxide (Cu2O) Particles for the Removal of Methyl Orange (MO) from Aqueous Media

Particles of sub-micron size possess significant capacity to adsorb organic molecules from aqueous media. Semiconductor photocatalysts in particle form could potentially be utilized for dye removal through either physical adsorption or photo-induced chemical process. The photocatalytic and adsorptio...

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Main Authors: Ho, Jeffrey Weng Chye, Tay, Qiuling, Qi, Huan, Huang, Zhaohong, Li, Jiao, Chen, Zhong
Other Authors: School of Materials Science & Engineering
Format: Article
Language:English
Published: 2018
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Online Access:https://hdl.handle.net/10356/86842
http://hdl.handle.net/10220/44264
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Institution: Nanyang Technological University
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spelling sg-ntu-dr.10356-868422020-09-26T22:10:17Z Photocatalytic and Adsorption Performances of Faceted Cuprous Oxide (Cu2O) Particles for the Removal of Methyl Orange (MO) from Aqueous Media Ho, Jeffrey Weng Chye Tay, Qiuling Qi, Huan Huang, Zhaohong Li, Jiao Chen, Zhong School of Materials Science & Engineering A*STAR SIMTech Cuprous Oxide (Cu2O) Adsorption Particles of sub-micron size possess significant capacity to adsorb organic molecules from aqueous media. Semiconductor photocatalysts in particle form could potentially be utilized for dye removal through either physical adsorption or photo-induced chemical process. The photocatalytic and adsorption capabilities of Cu2O particles with various exposed crystal facets have been studied through separate adsorption capacity test and photocatalytic degradation test. These crystals display unique cubic, octahedral, rhombic dodecahedral, and truncated polyhedral shapes due to specifically exposed crystal facet(s). For comparison, Cu2O particles with no clear exposed facets were also prepared. The current work confirms that the surface charge critically affects the adsorption performance of the synthesized Cu2O particles. The octahedral shaped Cu2O particles, with exposed {111} facets, possess the best adsorption capability of methyl orange (MO) dye due to the strongest positive surface charge among the different types of particles. In addition, we also found that the adsorption of MO follows the Langmuir monolayer mechanism. The octahedral particles also performed the best in photocatalytic dye degradation of MO under visible light irradiation because of the assistance from dye absorption. On top of the photocatalytic study, the stability of these Cu2O particles during the photocatalytic processes was also investigated. Cu(OH)2 and CuO are the likely corrosion products found on the particle surface after the photocorrosion in MO solution. By adding hole scavengers in the solution, the photocorrosion of Cu2O was greatly reduced. This observation confirms that the photocatalytically generated holes were responsible for the photocorrosion of Cu2O. NRF (Natl Research Foundation, S’pore) MOE (Min. of Education, S’pore) Published version 2018-01-08T07:11:19Z 2019-12-06T16:30:02Z 2018-01-08T07:11:19Z 2019-12-06T16:30:02Z 2017 Journal Article Ho, J. W. C., Tay, Q., Qi, H., Huang, Z., Li, J., & Chen, Z. (2017). Photocatalytic and Adsorption Performances of Faceted Cuprous Oxide (Cu2O) Particles for the Removal of Methyl Orange (MO) from Aqueous Media. Molecules, 22(4), 677-. 1420-3049 https://hdl.handle.net/10356/86842 http://hdl.handle.net/10220/44264 10.3390/molecules22040677 en Molecules © 2017 by The Author(s). Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/). 19 p. application/pdf
institution Nanyang Technological University
building NTU Library
country Singapore
collection DR-NTU
language English
topic Cuprous Oxide (Cu2O)
Adsorption
spellingShingle Cuprous Oxide (Cu2O)
Adsorption
Ho, Jeffrey Weng Chye
Tay, Qiuling
Qi, Huan
Huang, Zhaohong
Li, Jiao
Chen, Zhong
Photocatalytic and Adsorption Performances of Faceted Cuprous Oxide (Cu2O) Particles for the Removal of Methyl Orange (MO) from Aqueous Media
description Particles of sub-micron size possess significant capacity to adsorb organic molecules from aqueous media. Semiconductor photocatalysts in particle form could potentially be utilized for dye removal through either physical adsorption or photo-induced chemical process. The photocatalytic and adsorption capabilities of Cu2O particles with various exposed crystal facets have been studied through separate adsorption capacity test and photocatalytic degradation test. These crystals display unique cubic, octahedral, rhombic dodecahedral, and truncated polyhedral shapes due to specifically exposed crystal facet(s). For comparison, Cu2O particles with no clear exposed facets were also prepared. The current work confirms that the surface charge critically affects the adsorption performance of the synthesized Cu2O particles. The octahedral shaped Cu2O particles, with exposed {111} facets, possess the best adsorption capability of methyl orange (MO) dye due to the strongest positive surface charge among the different types of particles. In addition, we also found that the adsorption of MO follows the Langmuir monolayer mechanism. The octahedral particles also performed the best in photocatalytic dye degradation of MO under visible light irradiation because of the assistance from dye absorption. On top of the photocatalytic study, the stability of these Cu2O particles during the photocatalytic processes was also investigated. Cu(OH)2 and CuO are the likely corrosion products found on the particle surface after the photocorrosion in MO solution. By adding hole scavengers in the solution, the photocorrosion of Cu2O was greatly reduced. This observation confirms that the photocatalytically generated holes were responsible for the photocorrosion of Cu2O.
author2 School of Materials Science & Engineering
author_facet School of Materials Science & Engineering
Ho, Jeffrey Weng Chye
Tay, Qiuling
Qi, Huan
Huang, Zhaohong
Li, Jiao
Chen, Zhong
format Article
author Ho, Jeffrey Weng Chye
Tay, Qiuling
Qi, Huan
Huang, Zhaohong
Li, Jiao
Chen, Zhong
author_sort Ho, Jeffrey Weng Chye
title Photocatalytic and Adsorption Performances of Faceted Cuprous Oxide (Cu2O) Particles for the Removal of Methyl Orange (MO) from Aqueous Media
title_short Photocatalytic and Adsorption Performances of Faceted Cuprous Oxide (Cu2O) Particles for the Removal of Methyl Orange (MO) from Aqueous Media
title_full Photocatalytic and Adsorption Performances of Faceted Cuprous Oxide (Cu2O) Particles for the Removal of Methyl Orange (MO) from Aqueous Media
title_fullStr Photocatalytic and Adsorption Performances of Faceted Cuprous Oxide (Cu2O) Particles for the Removal of Methyl Orange (MO) from Aqueous Media
title_full_unstemmed Photocatalytic and Adsorption Performances of Faceted Cuprous Oxide (Cu2O) Particles for the Removal of Methyl Orange (MO) from Aqueous Media
title_sort photocatalytic and adsorption performances of faceted cuprous oxide (cu2o) particles for the removal of methyl orange (mo) from aqueous media
publishDate 2018
url https://hdl.handle.net/10356/86842
http://hdl.handle.net/10220/44264
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