New insights into the photocatalytic activity of 3-D core–shell P25@silica nanocomposites : impact of mesoporous coating
In this report, a three-dimensional (3-D) network of core–shell TiO2 (P25)–mesoporous SiO2 (P25@mSiO2) nanocomposites was prepared via a controllable surfactant-assisted sol–gel method. The nanocomposites were investigated for photocatalytic reactions of organic dye degradation, water splitting, and...
| Main Authors: | , , , , , , |
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| Format: | Journal Article |
| Language: | English |
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2018
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| Online Access: | https://hdl.handle.net/10356/87673 http://hdl.handle.net/10220/47023 |
| _version_ | 1811694639631040512 |
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| author | Gong, Yichao Wang, Dan Ping Wu, Renbing Gazi, Sarifuddin Soo, Han Sen Sritharan, Thirumany Chen, Zhong |
| author2 | School of Materials Science & Engineering |
| author_facet | School of Materials Science & Engineering Gong, Yichao Wang, Dan Ping Wu, Renbing Gazi, Sarifuddin Soo, Han Sen Sritharan, Thirumany Chen, Zhong |
| author_sort | Gong, Yichao |
| collection | NTU |
| description | In this report, a three-dimensional (3-D) network of core–shell TiO2 (P25)–mesoporous SiO2 (P25@mSiO2) nanocomposites was prepared via a controllable surfactant-assisted sol–gel method. The nanocomposites were investigated for photocatalytic reactions of organic dye degradation, water splitting, and CO2 reduction to understand the roles of the mSiO2 shell in these photocatalytic reactions. It was found that the mSiO2 shell accelerates the photodegradation of the organic dye, but dramatically reduces the photocatalytic activity of P25 in water splitting and CO2 reduction. The roles played by the mSiO2 shell in the photocatalytic reactions are summarized as: (1) effective prevention of agglomeration of P25 nanoparticles, (2) facilitating the transfer of uncharged photo-generated •OH radicals via the abundant –OH groups on the mesoporous surface, (3) provision of increased reaction sites between •OH radicals and dye molecules by its mesoporous nanostructure and large surface area, and (4) prevention of diffusion of the photo-generated charge carriers (photoelectrons and photoholes) because of its insulating nature. |
| first_indexed | 2024-10-01T07:10:46Z |
| format | Journal Article |
| id | ntu-10356/87673 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T07:10:46Z |
| publishDate | 2018 |
| record_format | dspace |
| spelling | ntu-10356/876732023-02-28T19:34:45Z New insights into the photocatalytic activity of 3-D core–shell P25@silica nanocomposites : impact of mesoporous coating Gong, Yichao Wang, Dan Ping Wu, Renbing Gazi, Sarifuddin Soo, Han Sen Sritharan, Thirumany Chen, Zhong School of Materials Science & Engineering School of Physical and Mathematical Sciences Photocatalysis P25 TiO2 Core-shell Nanoparticles DRNTU::Science::Chemistry In this report, a three-dimensional (3-D) network of core–shell TiO2 (P25)–mesoporous SiO2 (P25@mSiO2) nanocomposites was prepared via a controllable surfactant-assisted sol–gel method. The nanocomposites were investigated for photocatalytic reactions of organic dye degradation, water splitting, and CO2 reduction to understand the roles of the mSiO2 shell in these photocatalytic reactions. It was found that the mSiO2 shell accelerates the photodegradation of the organic dye, but dramatically reduces the photocatalytic activity of P25 in water splitting and CO2 reduction. The roles played by the mSiO2 shell in the photocatalytic reactions are summarized as: (1) effective prevention of agglomeration of P25 nanoparticles, (2) facilitating the transfer of uncharged photo-generated •OH radicals via the abundant –OH groups on the mesoporous surface, (3) provision of increased reaction sites between •OH radicals and dye molecules by its mesoporous nanostructure and large surface area, and (4) prevention of diffusion of the photo-generated charge carriers (photoelectrons and photoholes) because of its insulating nature. NRF (Natl Research Foundation, S’pore) MOE (Min. of Education, S’pore) Accepted version 2018-12-17T09:12:57Z 2019-12-06T16:46:58Z 2018-12-17T09:12:57Z 2019-12-06T16:46:58Z 2017 Journal Article Gong, Y., Wang, D. P., Wu, R., Gazi, S., Soo, H. S., Sritharan, T., & Chen, Z. (2017). New insights into the photocatalytic activity of 3-D core–shell P25@silica nanocomposites : impact of mesoporous coating. Dalton Transactions, 46(15), 4994-5002. doi:10.1039/C7DT00797C 1477-9226 https://hdl.handle.net/10356/87673 http://hdl.handle.net/10220/47023 10.1039/C7DT00797C en Dalton Transactions © 2017 Royal Society of Chemistry. This is the author created version of a work that has been peer reviewed and accepted for publication by Dalton Transactions, Royal Society of Chemistry. It incorporates referee’s comments but changes resulting from the publishing process, such as copyediting, structural formatting, may not be reflected in this document. The published version is available at: [http://dx.doi.org/10.1039/C7DT00797C]. application/pdf |
| spellingShingle | Photocatalysis P25 TiO2 Core-shell Nanoparticles DRNTU::Science::Chemistry Gong, Yichao Wang, Dan Ping Wu, Renbing Gazi, Sarifuddin Soo, Han Sen Sritharan, Thirumany Chen, Zhong New insights into the photocatalytic activity of 3-D core–shell P25@silica nanocomposites : impact of mesoporous coating |
| title | New insights into the photocatalytic activity of 3-D core–shell P25@silica nanocomposites : impact of mesoporous coating |
| title_full | New insights into the photocatalytic activity of 3-D core–shell P25@silica nanocomposites : impact of mesoporous coating |
| title_fullStr | New insights into the photocatalytic activity of 3-D core–shell P25@silica nanocomposites : impact of mesoporous coating |
| title_full_unstemmed | New insights into the photocatalytic activity of 3-D core–shell P25@silica nanocomposites : impact of mesoporous coating |
| title_short | New insights into the photocatalytic activity of 3-D core–shell P25@silica nanocomposites : impact of mesoporous coating |
| title_sort | new insights into the photocatalytic activity of 3 d core shell p25 silica nanocomposites impact of mesoporous coating |
| topic | Photocatalysis P25 TiO2 Core-shell Nanoparticles DRNTU::Science::Chemistry |
| url | https://hdl.handle.net/10356/87673 http://hdl.handle.net/10220/47023 |
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