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Fabrication of graphene nanoplatelets/MgAl-layered double hydroxide nanocomposites as efficient support for gold nanoparticles and their catalytic performance in 4-nitrophenol reduction
Process Safety and Environmental Protection, Volume: 174
Swansea University Authors:
Tom Dunlop , Edward Palmer, Chedly Tizaoui
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PDF | Version of Record
2023 The Author(s). Published by Elsevier Ltd on behalf of Institution of Chemical Engineers. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).
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DOI (Published version): 10.1016/j.psep.2023.04.051
Abstract
The catalytic reduction of 4-nitrophenol is of considerable importance to a multitude of applications and industries. The present work introduces a new catalyst (AuNP/GNP/MgAl-LDH) containing gold nanoparticles (AuNP) supported on graphene nanoplatelets (GNP) intercalated in Mg Al layered double hyd...
Published in: | Process Safety and Environmental Protection |
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ISSN: | 0957-5820 |
Published: |
Elsevier BV
2023
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Online Access: |
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URI: | https://cronfa.swan.ac.uk/Record/cronfa63347 |
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Abstract: |
The catalytic reduction of 4-nitrophenol is of considerable importance to a multitude of applications and industries. The present work introduces a new catalyst (AuNP/GNP/MgAl-LDH) containing gold nanoparticles (AuNP) supported on graphene nanoplatelets (GNP) intercalated in Mg Al layered double hydroxides (MgAl-LDH) for the reduction of 4-nitrophenol to 4-aminophenol using NaBH4 as a reducing agent. The catalyst was characterized by FTIR, XRD, STEM, TEM, and BET specific surface area. The XRD analysis showed the presence of crystalline phases of gold on the supports, while TEM demonstrated that MgAl-LDH provided uniform binding sites for AuNPs and prevented agglomeration. Similar reaction rate constant was determined for the disappearance of 4-nitrophenol and for the appearance of 4-aminophenol. The reaction rate constant was the highest for AuNP/GNP/MgAl-LDH, followed by AuNP/MgAl-LDH and AuNP/GNP. AuNP/GNP/MgAl-LDH was found stable after five repeated cycles. |
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Keywords: |
hydrotalcite, gold nanoparticles, graphene, nitrophenol, reduction |
College: |
Faculty of Science and Engineering |
Funders: |
Meriem Banou acknowledges the financial support from the Ministry of Higher Education of Algeria under the National Exceptional Program Grant (PNE). The authors acknowledge access to the Swansea University Advanced Imaging of Materials (AIM) Facility for catalyst characterisation. AIM is funded in part by the EPSRC (EP/M028267/1), the European Regional Development Fund through the Welsh Government (80708) and the Welsh Government's Ser Cymru program. |