This work proposes a preparation route to heterogeneous catalysts based on gold nanoparticles (AuNPs) supported on chemically modified silica. More specifically, the latter is functionalized with amino-sulfide branches (Au-SiO2@AeThio) through a thiol-yne radical coupling performed between cysteamine hydrochloride and an alkynyl-substituted triethoxysilane, followed by co-condensation with tetraethoxysilane (TEOS). The target procedure, involving only a gold precursor without any need of additional reducing and/or stabilizing agents, is straightforward, controllable, reproducible, and particularly appealing from a “green” point of view. The supported AuNPs, with an average diameter of 10 nm, possess a remarkable catalytic activity (specific rate constants of the order of 102 s1 mgcat 1) in the reduction of 4-nitrophenol (4-NP) to 4-aminophenol (4-AP) by sodium borohydride (NaBH4) in aqueous media. The higher performances with respect to previous literature work, along with the possibility of successfully recycling the catalyst, shows the developed materials as attractive functional platforms.

Functionalizaton of Silica through Thiol-Yne Radical Chemistry: a Catalytic System based on Gold Nanoparticles Supported on Amino-Sulfide-Branched Silica / Barbara Ballarin, Davide Barreca, Elisa Boanini, Elisa Bonansegna, Maria Cristina Cassani, Giorgio Carraro, Silvia Fazzini, Adriana Mignani, Daniele Nanni, Davide Pinelli. - In: RSC ADVANCES. - ISSN 2046-2069. - STAMPA. - 6:(2016), pp. 25780-25788. [10.1039/c6ra02479c]

Functionalizaton of Silica through Thiol-Yne Radical Chemistry: a Catalytic System based on Gold Nanoparticles Supported on Amino-Sulfide-Branched Silica

BALLARIN, BARBARA;BOANINI, ELISA;CASSANI, MARIA CRISTINA;FAZZINI, SILVIA;MIGNANI, ADRIANA;NANNI, DANIELE;PINELLI, DAVIDE
2016

Abstract

This work proposes a preparation route to heterogeneous catalysts based on gold nanoparticles (AuNPs) supported on chemically modified silica. More specifically, the latter is functionalized with amino-sulfide branches (Au-SiO2@AeThio) through a thiol-yne radical coupling performed between cysteamine hydrochloride and an alkynyl-substituted triethoxysilane, followed by co-condensation with tetraethoxysilane (TEOS). The target procedure, involving only a gold precursor without any need of additional reducing and/or stabilizing agents, is straightforward, controllable, reproducible, and particularly appealing from a “green” point of view. The supported AuNPs, with an average diameter of 10 nm, possess a remarkable catalytic activity (specific rate constants of the order of 102 s1 mgcat 1) in the reduction of 4-nitrophenol (4-NP) to 4-aminophenol (4-AP) by sodium borohydride (NaBH4) in aqueous media. The higher performances with respect to previous literature work, along with the possibility of successfully recycling the catalyst, shows the developed materials as attractive functional platforms.
2016
Functionalizaton of Silica through Thiol-Yne Radical Chemistry: a Catalytic System based on Gold Nanoparticles Supported on Amino-Sulfide-Branched Silica / Barbara Ballarin, Davide Barreca, Elisa Boanini, Elisa Bonansegna, Maria Cristina Cassani, Giorgio Carraro, Silvia Fazzini, Adriana Mignani, Daniele Nanni, Davide Pinelli. - In: RSC ADVANCES. - ISSN 2046-2069. - STAMPA. - 6:(2016), pp. 25780-25788. [10.1039/c6ra02479c]
Barbara Ballarin, Davide Barreca, Elisa Boanini, Elisa Bonansegna, Maria Cristina Cassani, Giorgio Carraro, Silvia Fazzini, Adriana Mignani, Daniele...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/535920
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