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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| Format: | Final Year Project (FYP) |
| Language: | English |
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2009
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| Online Access: | http://hdl.handle.net/10356/17127 |
| _version_ | 1811688753368924160 |
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| author | Yeow, Ronie Wai Leong. |
| author2 | Tan Thatt Yang Timothy |
| author_facet | Tan Thatt Yang Timothy Yeow, Ronie Wai Leong. |
| author_sort | Yeow, Ronie Wai Leong. |
| collection | NTU |
| description | 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. |
| first_indexed | 2024-10-01T05:37:13Z |
| format | Final Year Project (FYP) |
| id | ntu-10356/17127 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T05:37:13Z |
| publishDate | 2009 |
| record_format | dspace |
| spelling | ntu-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 |
| spellingShingle | DRNTU::Engineering::Chemical engineering::Biotechnological production Yeow, Ronie Wai Leong. Green building technology : development of visible light harvesting self-cleaning surface |
| title | 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_short | Green building technology : development of visible light harvesting self-cleaning surface |
| title_sort | green building technology development of visible light harvesting self cleaning surface |
| topic | DRNTU::Engineering::Chemical engineering::Biotechnological production |
| url | http://hdl.handle.net/10356/17127 |
| work_keys_str_mv | AT yeowroniewaileong greenbuildingtechnologydevelopmentofvisiblelightharvestingselfcleaningsurface |