| Title: |
Templated synthesis of multi-hierarchical layered double hydroxide microspheres † |
| Authors: |
Kondratowicz, T; Besnard, C; Turner, Z; Tan, J; Chen, C; Turnell-Ritson, R; O'Hare, D |
| Publisher Information: |
Royal Society of Chemistry |
| Publication Year: |
2025 |
| Collection: |
Oxford University Research Archive (ORA) |
| Description: |
Herein, we report a green, scalable and cost-effective synthesis of microspherical Mg/Al–CO3 LDHs with an average particle size and size distribution of 34 ± 6 μm with a multi-hierarchical morphology. The microspheres are composed of crystalline 300 nm thick Mg2.25±0.025Al–CO3 LDH platelets that are radially oriented into a hierarchical spherical motif. The LDH microspheres were synthesised via a hydrothermal reaction of NaAlO2 with flower-like MgO microspheres which serve as both a structural template and a magnesium source. Our optimised synthesis conditions allow a uniformly dispersed phase pure LDH formation within 2 h at 80 °C. Comprehensive characterisation, including XRD, FT-IR, TGA, FIB-SEM, N2 adsorption–desorption measurement, and CO2-TPD, revealed that the obtained LDH microspheres exhibit a high specific surface area, total pore volume and basicity number. Our time-resolved studies provided further insights into the kinetics, structure evolution and crystallinity changes during the transformation process. These multi-hierarchical LDH microspheres can be calcined to produce multi-hierarchical layered double oxide (LDO) microspheres that demonstrate an exceptional CO2 capture performance of 0.95 mmol g−1 (1 atm, 40 °C) and an adsorption capacity 2.8 times higher than that of flower-like MgO and 32 times higher than that of commercial MgO. This study highlights the potential for an atom-efficient templated synthesis of multi-hierarchical, porous LDH microspheres and their application in catalysis and sorption. |
| Document Type: |
article in journal/newspaper |
| Language: |
English |
| Relation: |
https://doi.org/10.1039/d5ta01511a |
| DOI: |
10.1039/d5ta01511a |
| Availability: |
https://doi.org/10.1039/d5ta01511a; https://ora.ox.ac.uk/objects/uuid:5200a665-2339-4848-b0bb-b3d26192e807 |
| Rights: |
info:eu-repo/semantics/openAccess ; CC Attribution (CC BY) 3.0 |
| Accession Number: |
edsbas.64E4F9FD |
| Database: |
BASE |