A highly sustainable prototype of a flow system based on gold nanoparticles (4.2 nm) supported on thiol‐functionalized halloysite nanotubes (HNTs) was developed for catalytic applications. The catalytic performances were evaluated using the reduction of 4‐nitrophenol to 4‐aminophenol as a model system. Under the best experimental conditions (0.0001 mol%, 1.97 × 10−8 mg of Au nanoparticles), an impressive apparent turnover frequency value up to 2 204 530 h−1 was achieved and the halloysite‐based catalyst showed full recyclability even after ten cycles. The high catalytic activity confirms the importance of the use of HNTs as support for Au nanoparticles that can exert a synergistic effect both as medium for transfer of electrons from borohydride ions to 4‐nitrophenol and by modulating interfacial electron transfer dynamics. With the application of flow technology, the obtained heterogeneous HNT@Au catalyst was fully recovered and reused for at least one month.

Marina Massaro, C.G.C. (2019). Gold nanoparticles stabilized by modified halloysite nanotubes for catalytic applications. APPLIED ORGANOMETALLIC CHEMISTRY, 33(3), 1-11 [10.1002/aoc.4665].

Gold nanoparticles stabilized by modified halloysite nanotubes for catalytic applications

Marina Massaro
;
Carmelo G. Colletti;Valeria La Parola;Giuseppe Lazzara;Serena Riela
2019-01-01

Abstract

A highly sustainable prototype of a flow system based on gold nanoparticles (4.2 nm) supported on thiol‐functionalized halloysite nanotubes (HNTs) was developed for catalytic applications. The catalytic performances were evaluated using the reduction of 4‐nitrophenol to 4‐aminophenol as a model system. Under the best experimental conditions (0.0001 mol%, 1.97 × 10−8 mg of Au nanoparticles), an impressive apparent turnover frequency value up to 2 204 530 h−1 was achieved and the halloysite‐based catalyst showed full recyclability even after ten cycles. The high catalytic activity confirms the importance of the use of HNTs as support for Au nanoparticles that can exert a synergistic effect both as medium for transfer of electrons from borohydride ions to 4‐nitrophenol and by modulating interfacial electron transfer dynamics. With the application of flow technology, the obtained heterogeneous HNT@Au catalyst was fully recovered and reused for at least one month.
Settore CHIM/06 - Chimica Organica
Settore CHIM/02 - Chimica Fisica
Marina Massaro, C.G.C. (2019). Gold nanoparticles stabilized by modified halloysite nanotubes for catalytic applications. APPLIED ORGANOMETALLIC CHEMISTRY, 33(3), 1-11 [10.1002/aoc.4665].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10447/346735
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