Aqueous-Phase Catalytic Chemical Reduction of p-Nitrophenol Employing Soluble Gold Nanoparticles with Different Shapes

Gold nanoparticles with different shapes were prepared and used as catalysts in the reduction of p-nitrophenol (PNP) in the aqueous phase and in the presence of sodium borohydride (NaBH4). Parameters such as the reaction temperature, substrate/NaBH4 molar ratio, and substrate/gold molar ratio were t...

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Main Authors:	Francyelle Moura de Oliveira, Lucas Rafael Bezerra de Araújo Nascimento, Claudia Manuela Santos Calado, Mario Roberto Meneghetti, Monique Gabriella Angelo da Silva
Format:	Article
Language:	English
Published:	MDPI AG 2016-12-01
Series:	Catalysts
Subjects:	soluble gold nanoparticles catalytic chemical reduction anisotropic nanoparticles reduction of nitro compounds
Online Access:	http://www.mdpi.com/2073-4344/6/12/215

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spelling	doaj-a8eebd6f574a49b7b9de4d5e7333c4a62020-11-24T22:29:40ZengMDPI AGCatalysts2073-43442016-12-0161221510.3390/catal6120215catal6120215Aqueous-Phase Catalytic Chemical Reduction of p-Nitrophenol Employing Soluble Gold Nanoparticles with Different ShapesFrancyelle Moura de Oliveira0Lucas Rafael Bezerra de Araújo Nascimento1Claudia Manuela Santos Calado2Mario Roberto Meneghetti3Monique Gabriella Angelo da Silva4Grupo de Catálise e Reatividade Química, Instituto de Química e Biotecnologia, Universidade Federal de Alagoas, Av. Lourival de Melo Mota s/n, Cidade Universitária, 57072-900 Maceió-AL, BrazilGrupo de Catálise e Reatividade Química, Instituto de Química e Biotecnologia, Universidade Federal de Alagoas, Av. Lourival de Melo Mota s/n, Cidade Universitária, 57072-900 Maceió-AL, BrazilGrupo de Catálise e Reatividade Química, Instituto de Química e Biotecnologia, Universidade Federal de Alagoas, Av. Lourival de Melo Mota s/n, Cidade Universitária, 57072-900 Maceió-AL, BrazilGrupo de Catálise e Reatividade Química, Instituto de Química e Biotecnologia, Universidade Federal de Alagoas, Av. Lourival de Melo Mota s/n, Cidade Universitária, 57072-900 Maceió-AL, BrazilGrupo de Catálise e Reatividade Química, Instituto de Química e Biotecnologia, Universidade Federal de Alagoas, Av. Lourival de Melo Mota s/n, Cidade Universitária, 57072-900 Maceió-AL, BrazilGold nanoparticles with different shapes were prepared and used as catalysts in the reduction of p-nitrophenol (PNP) in the aqueous phase and in the presence of sodium borohydride (NaBH4). Parameters such as the reaction temperature, substrate/NaBH4 molar ratio, and substrate/gold molar ratio were tested and evaluated. In this paper, we compare the catalytic reactivities of gold nanorods (AuNRs) and gold nanospheres (AuNSs), both synthesized by the seed-mediated method in the presence of cetyltrimethyl ammonium bromide (CTAB). Physical-chemical parameters such as the apparent rate constant (kapp) and activation energy (Ea) of the reactions were obtained for both systems. We observed that the catalytic system based on AuNRs is the most active. These colloidal dispersions were investigated and fully characterized by ultraviolet-visible absorption spectroscopy (UV–Vis) and transmission electron microscopy (TEM).http://www.mdpi.com/2073-4344/6/12/215soluble gold nanoparticlescatalytic chemical reductionanisotropic nanoparticlesreduction of nitro compounds
collection	DOAJ
language	English
format	Article
sources	DOAJ
author	Francyelle Moura de Oliveira Lucas Rafael Bezerra de Araújo Nascimento Claudia Manuela Santos Calado Mario Roberto Meneghetti Monique Gabriella Angelo da Silva
spellingShingle	Francyelle Moura de Oliveira Lucas Rafael Bezerra de Araújo Nascimento Claudia Manuela Santos Calado Mario Roberto Meneghetti Monique Gabriella Angelo da Silva Aqueous-Phase Catalytic Chemical Reduction of p-Nitrophenol Employing Soluble Gold Nanoparticles with Different Shapes Catalysts soluble gold nanoparticles catalytic chemical reduction anisotropic nanoparticles reduction of nitro compounds
author_facet	Francyelle Moura de Oliveira Lucas Rafael Bezerra de Araújo Nascimento Claudia Manuela Santos Calado Mario Roberto Meneghetti Monique Gabriella Angelo da Silva
author_sort	Francyelle Moura de Oliveira
title	Aqueous-Phase Catalytic Chemical Reduction of p-Nitrophenol Employing Soluble Gold Nanoparticles with Different Shapes
title_short	Aqueous-Phase Catalytic Chemical Reduction of p-Nitrophenol Employing Soluble Gold Nanoparticles with Different Shapes
title_full	Aqueous-Phase Catalytic Chemical Reduction of p-Nitrophenol Employing Soluble Gold Nanoparticles with Different Shapes
title_fullStr	Aqueous-Phase Catalytic Chemical Reduction of p-Nitrophenol Employing Soluble Gold Nanoparticles with Different Shapes
title_full_unstemmed	Aqueous-Phase Catalytic Chemical Reduction of p-Nitrophenol Employing Soluble Gold Nanoparticles with Different Shapes
title_sort	aqueous-phase catalytic chemical reduction of p-nitrophenol employing soluble gold nanoparticles with different shapes
publisher	MDPI AG
series	Catalysts
issn	2073-4344
publishDate	2016-12-01
description	Gold nanoparticles with different shapes were prepared and used as catalysts in the reduction of p-nitrophenol (PNP) in the aqueous phase and in the presence of sodium borohydride (NaBH4). Parameters such as the reaction temperature, substrate/NaBH4 molar ratio, and substrate/gold molar ratio were tested and evaluated. In this paper, we compare the catalytic reactivities of gold nanorods (AuNRs) and gold nanospheres (AuNSs), both synthesized by the seed-mediated method in the presence of cetyltrimethyl ammonium bromide (CTAB). Physical-chemical parameters such as the apparent rate constant (kapp) and activation energy (Ea) of the reactions were obtained for both systems. We observed that the catalytic system based on AuNRs is the most active. These colloidal dispersions were investigated and fully characterized by ultraviolet-visible absorption spectroscopy (UV–Vis) and transmission electron microscopy (TEM).
topic	soluble gold nanoparticles catalytic chemical reduction anisotropic nanoparticles reduction of nitro compounds
url	http://www.mdpi.com/2073-4344/6/12/215
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Aqueous-Phase Catalytic Chemical Reduction of p-Nitrophenol Employing Soluble Gold Nanoparticles with Different Shapes

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