Ordered mesoporous alumina with tunable morphologies and pore sizes for CO₂ capture and dye separation
We describe a versatile and scalable strategy toward long-range and periodically ordered mesoporous alumina (Al2O3) structures by evaporation-induced self-assembly of a structure-directing ABA triblock copolymer (F127) mixed with aluminum tri-sec-butoxide-derived sol additive. We found that the sepa...
| Main Authors: | , , , , , , , |
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| Format: | Journal Article |
| Language: | English |
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2021
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| Online Access: | https://hdl.handle.net/10356/152348 |
| _version_ | 1826120573359489024 |
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| author | Seah, Geok Leng Wang, Leyan Tan, Li Fang Tipjanrawee, Chanikarn Sasangka, Wardhana A. Usadi, Adam K. McConnachie, Jonathan M. Tan, Kwan Wee |
| author2 | School of Materials Science and Engineering |
| author_facet | School of Materials Science and Engineering Seah, Geok Leng Wang, Leyan Tan, Li Fang Tipjanrawee, Chanikarn Sasangka, Wardhana A. Usadi, Adam K. McConnachie, Jonathan M. Tan, Kwan Wee |
| author_sort | Seah, Geok Leng |
| collection | NTU |
| description | We describe a versatile and scalable strategy toward long-range and periodically ordered mesoporous alumina (Al2O3) structures by evaporation-induced self-assembly of a structure-directing ABA triblock copolymer (F127) mixed with aluminum tri-sec-butoxide-derived sol additive. We found that the separate preparation of the alkoxide sol-gel reaction before mixing with the block copolymer enabled access to a relatively unexplored parameter space of copolymer-to-additive composition, acid-to-metal molar ratio, and solvent, yielding ordered mesophases of two-dimensional (2D) lamellar, hexagonal cylinder, and 3D cage-like cubic lattices, as well as multiscale hierarchical ordered structures from spinodal decomposition-induced macro- and mesophase separation. Thermal annealing in air at 900 °C yielded well-ordered mesoporous crystalline γ-Al2O3 structures and hierarchically porous γ-Al2O3 with 3D interconnected macroscale and ordered mesoscale pore networks. The ordered Al2O3 structures exhibited tunable pore sizes in three different length scales, <2 nm (micropore), 2-11 nm (mesopore), and 1-5 μm (macropore), as well as high surface areas and pore volumes of up to 305 m2/g and 0.33 cm3/g, respectively. Moreover, the resultant mesoporous Al2O3 demonstrated enhanced adsorption capacities of carbon dioxide and Congo red dye. Such hierarchically ordered mesoporous Al2O3 are well-suited for green environmental solutions and urban sustainability applications, for example, high-temperature solid adsorbents and catalyst supports for carbon dioxide sequestration, fuel cells, and wastewater separation treatments. |
| first_indexed | 2024-10-01T05:18:41Z |
| format | Journal Article |
| id | ntu-10356/152348 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T05:18:41Z |
| publishDate | 2021 |
| record_format | dspace |
| spelling | ntu-10356/1523482023-08-04T02:18:04Z Ordered mesoporous alumina with tunable morphologies and pore sizes for CO₂ capture and dye separation Seah, Geok Leng Wang, Leyan Tan, Li Fang Tipjanrawee, Chanikarn Sasangka, Wardhana A. Usadi, Adam K. McConnachie, Jonathan M. Tan, Kwan Wee School of Materials Science and Engineering Engineering::Materials::Nanostructured materials Engineering::Nanotechnology Engineering::Materials::Functional materials CO₂ Capture Self-assembly We describe a versatile and scalable strategy toward long-range and periodically ordered mesoporous alumina (Al2O3) structures by evaporation-induced self-assembly of a structure-directing ABA triblock copolymer (F127) mixed with aluminum tri-sec-butoxide-derived sol additive. We found that the separate preparation of the alkoxide sol-gel reaction before mixing with the block copolymer enabled access to a relatively unexplored parameter space of copolymer-to-additive composition, acid-to-metal molar ratio, and solvent, yielding ordered mesophases of two-dimensional (2D) lamellar, hexagonal cylinder, and 3D cage-like cubic lattices, as well as multiscale hierarchical ordered structures from spinodal decomposition-induced macro- and mesophase separation. Thermal annealing in air at 900 °C yielded well-ordered mesoporous crystalline γ-Al2O3 structures and hierarchically porous γ-Al2O3 with 3D interconnected macroscale and ordered mesoscale pore networks. The ordered Al2O3 structures exhibited tunable pore sizes in three different length scales, <2 nm (micropore), 2-11 nm (mesopore), and 1-5 μm (macropore), as well as high surface areas and pore volumes of up to 305 m2/g and 0.33 cm3/g, respectively. Moreover, the resultant mesoporous Al2O3 demonstrated enhanced adsorption capacities of carbon dioxide and Congo red dye. Such hierarchically ordered mesoporous Al2O3 are well-suited for green environmental solutions and urban sustainability applications, for example, high-temperature solid adsorbents and catalyst supports for carbon dioxide sequestration, fuel cells, and wastewater separation treatments. Nanyang Technological University This work was supported by a member-directed research grant from ExxonMobil through the Singapore Energy Center (EM11161.TO6) and a startup grant from Nanyang Technological University, Singapore. This work made use of research facilities at the Facility for Analysis, Characterization, Testing and Simulation (FACTS), Nanyang Technological University, Singapore. C.T. gratefully acknowledges an overseas training program grant from King Mongkut’s Institute of Technology Ladkrabang. 2021-09-07T04:38:43Z 2021-09-07T04:38:43Z 2021 Journal Article Seah, G. L., Wang, L., Tan, L. F., Tipjanrawee, C., Sasangka, W. A., Usadi, A. K., McConnachie, J. M. & Tan, K. W. (2021). Ordered mesoporous alumina with tunable morphologies and pore sizes for CO₂ capture and dye separation. ACS Applied Materials and Interfaces, 13(30), 36117-36129. https://dx.doi.org/10.1021/acsami.1c06151 1944-8244 https://hdl.handle.net/10356/152348 10.1021/acsami.1c06151 34288649 30 13 36117 36129 en EM11161.TO6 ACS Applied Materials and Interfaces 10.21979/N9/OLXPBS This document is the Accepted Manuscript version of a Published Work that appeared in final form in ACS Applied Materials and Interfaces, copyright © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see https://doi.org/10.1021/acsami.1c06151 application/pdf |
| spellingShingle | Engineering::Materials::Nanostructured materials Engineering::Nanotechnology Engineering::Materials::Functional materials CO₂ Capture Self-assembly Seah, Geok Leng Wang, Leyan Tan, Li Fang Tipjanrawee, Chanikarn Sasangka, Wardhana A. Usadi, Adam K. McConnachie, Jonathan M. Tan, Kwan Wee Ordered mesoporous alumina with tunable morphologies and pore sizes for CO₂ capture and dye separation |
| title | Ordered mesoporous alumina with tunable morphologies and pore sizes for CO₂ capture and dye separation |
| title_full | Ordered mesoporous alumina with tunable morphologies and pore sizes for CO₂ capture and dye separation |
| title_fullStr | Ordered mesoporous alumina with tunable morphologies and pore sizes for CO₂ capture and dye separation |
| title_full_unstemmed | Ordered mesoporous alumina with tunable morphologies and pore sizes for CO₂ capture and dye separation |
| title_short | Ordered mesoporous alumina with tunable morphologies and pore sizes for CO₂ capture and dye separation |
| title_sort | ordered mesoporous alumina with tunable morphologies and pore sizes for co₂ capture and dye separation |
| topic | Engineering::Materials::Nanostructured materials Engineering::Nanotechnology Engineering::Materials::Functional materials CO₂ Capture Self-assembly |
| url | https://hdl.handle.net/10356/152348 |
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