Gold Nanorods Capped with Different Ammonium Bromide Salts on the Catalytic Chemical Reduction of p-Nitrophenol
- 1 January 2021
- journal article
- research article
- Published by Sociedade Brasileira de Quimica (SBQ) in Journal of the Brazilian Chemical Society
- Vol. 32 (6), 1186-1192
- https://doi.org/10.21577/0103-5053.20210019
Abstract
It is known that the reactivity of the nanocatalytic systems is related to the particle size and shape and also to the features of the capping agents on the nanostructures. In this study, gold nanorods (AuNRs) were synthesized by the seed-mediated method using different tetraalkylammonium bromide salts as capping agents, that are, cetyltrimethylammonium (CTABr), N,N-dimethyl-N‑cetyl-N-(2-hydroxyethyl)ammonium (HEA16Br), and N,N-dimethyl-N-cetyl- N-(2-hydroxypropyl)ammonium (HPA16Br), and used as catalyst for the chemical reduction of p-nitrophenol (PNP) in the presence of NaBH4. The catalytic systems were characterized by ultraviolet-visible (UV-Vis) absorption spectroscopy and transmission electron microscopy (TEM). The effect of the ammonium bromide-based capping agent on the catalytic activity of AuNRs was evaluated by performing the chemical reduction of p-nitrophenol in the presence of excess NaBH4 in aqueous medium. Under the reaction conditions employed, the catalytic systems displayed detectable subtle differences in terms of induction times and apparent activation energy (Ea) values. These results show that slight changes carried out in the chemical structure of the capping agent are able to imprint even slightly modification of the kinetic parameter of the catalytic reaction.Keywords
This publication has 57 references indexed in Scilit:
- An exceptionally active and selective Pt–Au/TiO2catalyst for hydrogenation of the nitro group in chloronitrobenzeneGreen Chemistry, 2012
- Kinetic Analysis of Catalytic Reduction of 4-Nitrophenol by Metallic Nanoparticles Immobilized in Spherical Polyelectrolyte BrushesThe Journal of Physical Chemistry C, 2010
- Size-Dependent Catalytic Activity and Dynamics of Gold Nanoparticles at the Single-Molecule LevelJournal of the American Chemical Society, 2009
- A Comparison Study of the Catalytic Properties of Au-Based Nanocages, Nanoboxes, and NanoparticlesNano Letters, 2009
- Shape-Controlled Catalysis by Cetyltrimethylammonium Bromide Terminated Gold Nanospheres, Nanorods, and NanoprismsThe Journal of Physical Chemistry C, 2009
- Catalytic Activity of Palladium Nanoparticles Encapsulated in Spherical Polyelectrolyte Brushes and Core−Shell MicrogelsChemistry of Materials, 2007
- Quantitation of Metal Content in the Silver-Assisted Growth of Gold NanorodsThe Journal of Physical Chemistry B, 2006
- Anisotropic Metal Nanoparticles: Synthesis, Assembly, and Optical ApplicationsThe Journal of Physical Chemistry B, 2005
- Chemistry and Properties of Nanocrystals of Different ShapesChemical Reviews, 2005
- Preparation and Growth Mechanism of Gold Nanorods (NRs) Using Seed-Mediated Growth MethodChemistry of Materials, 2003