An ion exchange approach assembled multi-dimensional hierarchical Fe – TiO2 composite micro-/nano multi-shell hollow spheres for bacteria lysis through utilizing visible light
The ion exchange approach demonstrates the fabrication of the hierarchical, multi-shell, micro-/nano, Fe–TiO2 composite hollow spheres (HMS). The synthesis mechanism elucidates a novel technique to achieve a Fe–TiO2 composite multi-shell structure by first allowing Fe ions to penetrate the pores of...
| Main Authors: | , , , , , |
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| Other Authors: | |
| Format: | Journal Article |
| Language: | English |
| Published: |
2020
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| Online Access: | https://hdl.handle.net/10356/140924 |
| _version_ | 1826110204644687872 |
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| author | Ang, Jeremy Koon Keong Chua, Jestoni Song Mi Chang, Zhong Jie Li, Zhengtao Bai, Hongwei Sun, Darren Delai |
| author2 | School of Civil and Environmental Engineering |
| author_facet | School of Civil and Environmental Engineering Ang, Jeremy Koon Keong Chua, Jestoni Song Mi Chang, Zhong Jie Li, Zhengtao Bai, Hongwei Sun, Darren Delai |
| author_sort | Ang, Jeremy Koon Keong |
| collection | NTU |
| description | The ion exchange approach demonstrates the fabrication of the hierarchical, multi-shell, micro-/nano, Fe–TiO2 composite hollow spheres (HMS). The synthesis mechanism elucidates a novel technique to achieve a Fe–TiO2 composite multi-shell structure by first allowing Fe ions to penetrate the pores of carbonaceous spheres at room temperature. This is followed by ion exchange in a solvothermal treatment. Lastly, the outward diffusion of the Fe ions allows the inward diffusion of Ti ions to fill the voids created within the pores of the carbonaceous spheres and simultaneously form hierarchical thorns. The ion exchange enabled a deeper penetration of Ti ions into the pores of the carbonaceous spheres. The oxidization of the carbonaceous spheres leads to the convergence of deeply penetrated Ti–Fe ions which crystallize to form Fe–TiO2 composite multi-shell spheres. The HMS spheres revealed an agglomeration of 20 nm nanoparticulates and a uniform dispersion of Fe–TiO2 composite. Increasing the Fe ion penetration duration from 6 h up to 48 h was found to gradually reduce the band gap from 3.1 eV to approximately 2.7 eV. The synthesis mechanism elucidates the compaction of metal ions within the pores of the carbonaceous spheres which leads to a smoother inner sphere morphology and, consequently, the reduction in the mesopores diameter from 15 nm to 4 nm. The HMS demonstrate an enhanced physical lysis of 40% bacteria under dark conditions owing to the hierarchical thorn-like structure and an enhanced bactericidal capability to 70% under the irradiation of visible light over a period of 1 h. The initial physical lysis by the hierarchical thorn surface to the cell and the subsequent release of reactive oxygen species to degrade the ruptured bacteria wall or access the RNA/DNA led to further cell death. |
| first_indexed | 2024-10-01T02:30:35Z |
| format | Journal Article |
| id | ntu-10356/140924 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T02:30:35Z |
| publishDate | 2020 |
| record_format | dspace |
| spelling | ntu-10356/1409242020-06-03T02:21:19Z An ion exchange approach assembled multi-dimensional hierarchical Fe – TiO2 composite micro-/nano multi-shell hollow spheres for bacteria lysis through utilizing visible light Ang, Jeremy Koon Keong Chua, Jestoni Song Mi Chang, Zhong Jie Li, Zhengtao Bai, Hongwei Sun, Darren Delai School of Civil and Environmental Engineering Nano Sun Pte Ltd NTU Innovation Centre Engineering::Civil engineering Fe–TiO2 Composite Bacteria Lysis The ion exchange approach demonstrates the fabrication of the hierarchical, multi-shell, micro-/nano, Fe–TiO2 composite hollow spheres (HMS). The synthesis mechanism elucidates a novel technique to achieve a Fe–TiO2 composite multi-shell structure by first allowing Fe ions to penetrate the pores of carbonaceous spheres at room temperature. This is followed by ion exchange in a solvothermal treatment. Lastly, the outward diffusion of the Fe ions allows the inward diffusion of Ti ions to fill the voids created within the pores of the carbonaceous spheres and simultaneously form hierarchical thorns. The ion exchange enabled a deeper penetration of Ti ions into the pores of the carbonaceous spheres. The oxidization of the carbonaceous spheres leads to the convergence of deeply penetrated Ti–Fe ions which crystallize to form Fe–TiO2 composite multi-shell spheres. The HMS spheres revealed an agglomeration of 20 nm nanoparticulates and a uniform dispersion of Fe–TiO2 composite. Increasing the Fe ion penetration duration from 6 h up to 48 h was found to gradually reduce the band gap from 3.1 eV to approximately 2.7 eV. The synthesis mechanism elucidates the compaction of metal ions within the pores of the carbonaceous spheres which leads to a smoother inner sphere morphology and, consequently, the reduction in the mesopores diameter from 15 nm to 4 nm. The HMS demonstrate an enhanced physical lysis of 40% bacteria under dark conditions owing to the hierarchical thorn-like structure and an enhanced bactericidal capability to 70% under the irradiation of visible light over a period of 1 h. The initial physical lysis by the hierarchical thorn surface to the cell and the subsequent release of reactive oxygen species to degrade the ruptured bacteria wall or access the RNA/DNA led to further cell death. 2020-06-03T02:21:19Z 2020-06-03T02:21:19Z 2018 Journal Article Ang, J. K. K., Chua, J. S. M., Chang, Z. J., Li, Z., Bai, H., & Sun, D. D. (2018). An ion exchange approach assembled multi-dimensional hierarchical Fe – TiO2 composite micro-/nano multi-shell hollow spheres for bacteria lysis through utilizing visible light. Catalysis Science & Technnology, 8(8), 2077-2086. doi:10.1039/c8cy00078f 2044-4753 https://hdl.handle.net/10356/140924 10.1039/c8cy00078f 2-s2.0-85046011232 8 8 2077 2086 en Catalysis Science & Technology © 2018 The Royal Society of Chemistry. All rights reserved. |
| spellingShingle | Engineering::Civil engineering Fe–TiO2 Composite Bacteria Lysis Ang, Jeremy Koon Keong Chua, Jestoni Song Mi Chang, Zhong Jie Li, Zhengtao Bai, Hongwei Sun, Darren Delai An ion exchange approach assembled multi-dimensional hierarchical Fe – TiO2 composite micro-/nano multi-shell hollow spheres for bacteria lysis through utilizing visible light |
| title | An ion exchange approach assembled multi-dimensional hierarchical Fe – TiO2 composite micro-/nano multi-shell hollow spheres for bacteria lysis through utilizing visible light |
| title_full | An ion exchange approach assembled multi-dimensional hierarchical Fe – TiO2 composite micro-/nano multi-shell hollow spheres for bacteria lysis through utilizing visible light |
| title_fullStr | An ion exchange approach assembled multi-dimensional hierarchical Fe – TiO2 composite micro-/nano multi-shell hollow spheres for bacteria lysis through utilizing visible light |
| title_full_unstemmed | An ion exchange approach assembled multi-dimensional hierarchical Fe – TiO2 composite micro-/nano multi-shell hollow spheres for bacteria lysis through utilizing visible light |
| title_short | An ion exchange approach assembled multi-dimensional hierarchical Fe – TiO2 composite micro-/nano multi-shell hollow spheres for bacteria lysis through utilizing visible light |
| title_sort | ion exchange approach assembled multi dimensional hierarchical fe tio2 composite micro nano multi shell hollow spheres for bacteria lysis through utilizing visible light |
| topic | Engineering::Civil engineering Fe–TiO2 Composite Bacteria Lysis |
| url | https://hdl.handle.net/10356/140924 |
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