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      Gold Nanorods Capped with Different Ammonium Bromide Salts on the Catalytic Chemical Reduction of p-Nitrophenol

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          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 tetra-alkylammonium 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.

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          Most cited references61

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          J. Braz. Chem. Soc

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            Angew. Chem., Int. Ed.

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              Physical Chemistry

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                Author and article information

                Journal
                jbchs
                Journal of the Brazilian Chemical Society
                J. Braz. Chem. Soc.
                Sociedade Brasileira de Química (São Paulo, SP, Brazil )
                0103-5053
                1678-4790
                June 2021
                : 32
                : 6
                : 1186-1192
                Affiliations
                [1] Maceió orgnameUniversidade Federal de Alagoas orgdiv1Instituto de Química e Biotecnologia orgdiv2Grupo de Catálise e Reatividade Química Brazil
                Article
                S0103-50532021000601186 S0103-5053(21)03200601186
                10.21577/0103-5053.20210019
                91c39700-1e5b-46f5-92e2-ed181b7a7d82

                This work is licensed under a Creative Commons Attribution 4.0 International License.

                History
                : 11 November 2020
                : 09 February 2021
                Page count
                Figures: 0, Tables: 0, Equations: 0, References: 62, Pages: 7
                Product

                SciELO Brazil

                Categories
                Article

                capping agents,ammonium salts,catalytic chemical reduction,p-nitrophenol,gold nanorods

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