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Catalysts 2016, 6(12), 215; doi:10.3390/catal6120215

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

Grupo 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, Brazil
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Authors to whom correspondence should be addressed.
Academic Editors: Alain Roucoux, Audrey Denicourt and Keith Hohn
Received: 3 November 2016 / Revised: 30 November 2016 / Accepted: 14 December 2016 / Published: 21 December 2016
(This article belongs to the Special Issue Soluble Nanoparticles in Catalytic Applications)
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Abstract

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). View Full-Text
Keywords: soluble gold nanoparticles; catalytic chemical reduction; anisotropic nanoparticles; reduction of nitro compounds soluble gold nanoparticles; catalytic chemical reduction; anisotropic nanoparticles; reduction of nitro compounds
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

de Oliveira, F.M.; Nascimento, L.R.B.A.; Calado, C.M.S.; Meneghetti, M.R.; da Silva, M.G.A. Aqueous-Phase Catalytic Chemical Reduction of p-Nitrophenol Employing Soluble Gold Nanoparticles with Different Shapes. Catalysts 2016, 6, 215.

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