1. Functionalizaton of silica through thiol-yne radical chemistry: a catalytic system based on gold nanoparticles supported on amino-sulfide-branched silica
- Author
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Barbara Ballarin, Maria Cristina Cassani, Adriana Mignani, Davide Pinelli, Silvia Fazzini, Elisa Boanini, Elisa Bonansegna, Daniele Nanni, Giorgio Carraro, Davide Barreca, ARAG - AREA FINANZA E PARTECIPATE, DIPARTIMENTO DI CHIMICA 'GIACOMO CIAMICIAN', DIPARTIMENTO DI CHIMICA INDUSTRIALE 'TOSO MONTANARI', DIPARTIMENTO DI INGEGNERIA CIVILE, CHIMICA, AMBIENTALE E DEI MATERIALI, and Facolta' di CHIMICA INDUSTRIALE
- Subjects
Sulfide ,General Chemical Engineering ,Radical ,02 engineering and technology ,010402 general chemistry ,Heterogeneous catalysis ,01 natural sciences ,Catalysis ,Sodium borohydride ,chemistry.chemical_compound ,gold nanoparticles, heterogeneous catalysis, functionalized silica, thiol–yne radical coupling ,Organic chemistry ,Chemical Engineering (all) ,chemistry.chemical_classification ,Chemistry ,Chemistry (all) ,General Chemistry ,021001 nanoscience & nanotechnology ,Combinatorial chemistry ,0104 chemical sciences ,functionalized silica ,heterogeneous catalysis ,Colloidal gold ,silica ,gold nanoparticles ,Triethoxysilane ,Surface modification ,functionalization ,thiol–yne radical coupling ,0210 nano-technology - Abstract
none 10 no 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. mixed Barbara Ballarin; Davide Barreca; Elisa Boanini; Elisa Bonansegna; Maria Cristina Cassani; Giorgio Carraro; Silvia Fazzini; Adriana Mignani; Daniele Nanni; Davide Pinelli Barbara Ballarin; Davide Barreca; Elisa Boanini; Elisa Bonansegna; Maria Cristina Cassani; Giorgio Carraro; Silvia Fazzini; Adriana Mignani; Daniele Nanni; Davide Pinelli
- Published
- 2016
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