Green building technology : development of visible light harvesting self-cleaning surface
TiO2 had been studied extensively in the development of self-cleaning glasses. However, due to its large band gap energy (Eg = 3.2 eV), pure TiO2 exhibits photocatalytic activity only under UV irradiation. In the current work, the incorporation of InVO4, which is a novel narrow band gap semiconducto...
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sg-ntu-dr.10356-171272023-03-03T15:36:40Z Green building technology : development of visible light harvesting self-cleaning surface Yeow, Ronie Wai Leong. Tan Thatt Yang Timothy School of Chemical and Biomedical Engineering DRNTU::Engineering::Chemical engineering::Biotechnological production TiO2 had been studied extensively in the development of self-cleaning glasses. However, due to its large band gap energy (Eg = 3.2 eV), pure TiO2 exhibits photocatalytic activity only under UV irradiation. In the current work, the incorporation of InVO4, which is a novel narrow band gap semiconductor (Eg = 2.0 eV), into TiO2 is anticipated to improve the photocatalytic activity of TiO2-InVO4 thin films under visible light. In our experiment, transparent TiO2-InVO4¬-coated glass substrates were synthesized using simple sol-gel method. XRD spectra showed that the TiO2-InVO4 samples are highly dispersed and consist of uniform anatase TiO2 nanocrystals. TiO2-InVO4 nanocomposites exhibited extended light absorbance in the visible light regime with a significant red shift in light absorption from 400 nm, which corresponds to pure anatase TiO2 thin films, to 565 nm corresponding to TiO2-InVO4 composite with 3.0 wt% InVO4 (10.0 mol% PEI). Besides that, TiO2-InVO4-coated glass substrates remained hydrophilic even after 30 days of storage in the dark. The TiO2-InVO4 thin films also exhibited high photocatalytic activity under visible light irradiation. Photo-induced decomposition of stearic acid for TiO2-InVO4 3.0 wt% InVO4 (10.0 mol% PEI) reached an average rate of 2.5 nm/h compared to those of TiO2, which is only 0.8 nm/h. Bachelor of Engineering (Chemical and Biomolecular Engineering) 2009-06-01T01:22:09Z 2009-06-01T01:22:09Z 2009 2009 Final Year Project (FYP) http://hdl.handle.net/10356/17127 en Nanyang Technological University 65 p. application/pdf |
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DRNTU::Engineering::Chemical engineering::Biotechnological production Yeow, Ronie Wai Leong. Green building technology : development of visible light harvesting self-cleaning surface |
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TiO2 had been studied extensively in the development of self-cleaning glasses. However, due to its large band gap energy (Eg = 3.2 eV), pure TiO2 exhibits photocatalytic activity only under UV irradiation. In the current work, the incorporation of InVO4, which is a novel narrow band gap semiconductor (Eg = 2.0 eV), into TiO2 is anticipated to improve the photocatalytic activity of TiO2-InVO4 thin films under visible light. In our experiment, transparent TiO2-InVO4¬-coated glass substrates were synthesized using simple sol-gel method. XRD spectra showed that the TiO2-InVO4 samples are highly dispersed and consist of uniform anatase TiO2 nanocrystals. TiO2-InVO4 nanocomposites exhibited extended light absorbance in the visible light regime with a significant red shift in light absorption from 400 nm, which corresponds to pure anatase TiO2 thin films, to 565 nm corresponding to TiO2-InVO4 composite with 3.0 wt% InVO4 (10.0 mol% PEI). Besides that, TiO2-InVO4-coated glass substrates remained hydrophilic even after 30 days of storage in the dark. The TiO2-InVO4 thin films also exhibited high photocatalytic activity under visible light irradiation. Photo-induced decomposition of stearic acid for TiO2-InVO4 3.0 wt% InVO4 (10.0 mol% PEI) reached an average rate of 2.5 nm/h compared to those of TiO2, which is only 0.8 nm/h. |
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Tan Thatt Yang Timothy |
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Tan Thatt Yang Timothy Yeow, Ronie Wai Leong. |
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Final Year Project |
author |
Yeow, Ronie Wai Leong. |
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Yeow, Ronie Wai Leong. |
title |
Green building technology : development of visible light harvesting self-cleaning surface |
title_short |
Green building technology : development of visible light harvesting self-cleaning surface |
title_full |
Green building technology : development of visible light harvesting self-cleaning surface |
title_fullStr |
Green building technology : development of visible light harvesting self-cleaning surface |
title_full_unstemmed |
Green building technology : development of visible light harvesting self-cleaning surface |
title_sort |
green building technology : development of visible light harvesting self-cleaning surface |
publishDate |
2009 |
url |
http://hdl.handle.net/10356/17127 |
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1759855717055987712 |