Semiconductor nanocrystal based visible light photocatalyst for organic dye degradation

Environmental pollution caused by organic pollutants presents a severe ecological problem regarding the difficulty of degradation. Application of photocatalysis appears to be the most appealing and promising method for decomposition of toxic organic compounds. Titanium (TiO2) is the most widely expl...

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Main Author: You, Xuangang
Other Authors: School of Chemical and Biomedical Engineering
Format: Final Year Project
Language:English
Published: 2014
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Online Access:http://hdl.handle.net/10356/61641
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Institution: Nanyang Technological University
Language: English
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spelling sg-ntu-dr.10356-616412023-03-03T15:32:27Z Semiconductor nanocrystal based visible light photocatalyst for organic dye degradation You, Xuangang School of Chemical and Biomedical Engineering Duan Hongwei DRNTU::Engineering Environmental pollution caused by organic pollutants presents a severe ecological problem regarding the difficulty of degradation. Application of photocatalysis appears to be the most appealing and promising method for decomposition of toxic organic compounds. Titanium (TiO2) is the most widely explored photocatalytic material largely due to its low cost, high chemical stability and relatively high catalytic efficiency. However, TiO2 cannot be used for effective solar energy harvesting and conversions due to its large bandgap. Significant challenges remain in developing a visible light driven photocatalyst. In this project, semiconductor nanocrystals CdS, CdSe, and CdSeS synthesized by hotinjection method were studied due to their tunable bandgap, and the absorption in the visible light range. CdS nanocrystal with bandgap of 2.68eV, absorption wavelength of 463nm was proved to be the most efficient photocatalyst among CdS, CdSeS, and CdSe for organic dye degradation. With the presence of Lactic Acid, CdS could successfully degraded 92% of Rhodamine B in 10 minutes which was significantly higher than the degradation rate of 30% with P25 TiO2 under the same condition. Bachelor of Engineering (Chemical and Biomolecular Engineering) 2014-07-01T06:47:59Z 2014-07-01T06:47:59Z 2014 2014 Final Year Project (FYP) http://hdl.handle.net/10356/61641 en Nanyang Technological University 67 p. application/pdf
institution Nanyang Technological University
building NTU Library
continent Asia
country Singapore
Singapore
content_provider NTU Library
collection DR-NTU
language English
topic DRNTU::Engineering
spellingShingle DRNTU::Engineering
You, Xuangang
Semiconductor nanocrystal based visible light photocatalyst for organic dye degradation
description Environmental pollution caused by organic pollutants presents a severe ecological problem regarding the difficulty of degradation. Application of photocatalysis appears to be the most appealing and promising method for decomposition of toxic organic compounds. Titanium (TiO2) is the most widely explored photocatalytic material largely due to its low cost, high chemical stability and relatively high catalytic efficiency. However, TiO2 cannot be used for effective solar energy harvesting and conversions due to its large bandgap. Significant challenges remain in developing a visible light driven photocatalyst. In this project, semiconductor nanocrystals CdS, CdSe, and CdSeS synthesized by hotinjection method were studied due to their tunable bandgap, and the absorption in the visible light range. CdS nanocrystal with bandgap of 2.68eV, absorption wavelength of 463nm was proved to be the most efficient photocatalyst among CdS, CdSeS, and CdSe for organic dye degradation. With the presence of Lactic Acid, CdS could successfully degraded 92% of Rhodamine B in 10 minutes which was significantly higher than the degradation rate of 30% with P25 TiO2 under the same condition.
author2 School of Chemical and Biomedical Engineering
author_facet School of Chemical and Biomedical Engineering
You, Xuangang
format Final Year Project
author You, Xuangang
author_sort You, Xuangang
title Semiconductor nanocrystal based visible light photocatalyst for organic dye degradation
title_short Semiconductor nanocrystal based visible light photocatalyst for organic dye degradation
title_full Semiconductor nanocrystal based visible light photocatalyst for organic dye degradation
title_fullStr Semiconductor nanocrystal based visible light photocatalyst for organic dye degradation
title_full_unstemmed Semiconductor nanocrystal based visible light photocatalyst for organic dye degradation
title_sort semiconductor nanocrystal based visible light photocatalyst for organic dye degradation
publishDate 2014
url http://hdl.handle.net/10356/61641
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