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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

Meriem Banou, Yubiao Niu, Fatima Ammari, Tom Dunlop Orcid Logo, Edward Palmer, Chedly Tizaoui Orcid Logo

Process Safety and Environmental Protection, Volume: 174

Swansea University Authors: Tom Dunlop Orcid Logo, Edward Palmer, Chedly Tizaoui Orcid Logo

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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...

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Published in: Process Safety and Environmental Protection
ISSN: 0957-5820
Published: Elsevier BV 2023
Online Access: Check full text

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.
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.

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