Utilize este identificador para referenciar este registo: http://hdl.handle.net/10400.21/8687
Título: Effect of phenolic compounds on the synthesis of gold nanoparticles and its catalytic activity in the reduction of nitro compounds
Autor: Alegria, Elisabete C. B. A.
Ribeiro, Ana P. C.
Mendes, Marta
Ferraria, Ana M.
Rego, Ana M. Botelho do
Pombeiro, Armando J. L.
Palavras-chave: Gold nanoparticles
Phytochemicals
Catalysis
Reduction
Nitro compounds
Data: Mai-2018
Editora: MDPI
Citação: ALEGRIA, Elisabete C. B. A.; [et al] – Effect of phenolic compounds on the synthesis of gold nanoparticles and its catalytic activity in the reduction of nitro compounds. Nanomaterials. ISSN 2079-4991. Vol. 8, N.º 5 (2018), pp. 1-18
Resumo: Gold nanoparticles (AuNPs) were prepared using an eco-friendly approach in a single step by reduction of HAuCl4 with polyphenols from tea extracts, which act as both reducing and capping agents. The obtained AuNPs were characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), ultraviolet–visible spectroscopy (UV–vis), and X-ray photoelectron spectroscopy (XPS). They act as highly efficient catalysts in the reduction of various aromatic nitro compounds in aqueous solution. The effects of a variety of factors (e.g., reaction time, type and amount of reducing agent, shape, size, or amount of AuNPs) were studied towards the optimization of the processes. The total polyphenol content (TPC) was determined before and after the catalytic reaction and the results are discussed in terms of the tea extract percentage, the size of the AuNPs, and their catalytic activity. The reusability of the AuNP catalyst in the reduction of 4-nitrophenol was also tested. The reactions follow pseudo first-order kinetics.
Descrição: Este trabalho foi financiado pelo Concurso Anual para Projetos de Investigação, Desenvolvimento, Inovação e Criação Artística (IDI&CA) 2016 do Instituto Politécnico de Lisboa. Código de referência IPL/2016/MechSynCat/ISEL
Peer review: yes
URI: http://hdl.handle.net/10400.21/8687
DOI: https://doi:10.3390/nano8050320
ISSN: 2079-4991
Aparece nas colecções:ISEL - Eng. Quim. Biol. - Artigos

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