Gold nanoparticles stabilized by modified halloysite nanotubes for catalytic applications. (27th December 2018)

• Record Type: Journal Article
• Authors: Massaro, Marina; Colletti, Carmelo G.; Fiore, Bruno; La Parola, Valeria; Lazzara, Giuseppe; Guernelli, Susanna; Zaccheroni, Nelsi; Riela, Serena
• Is Part Of: Applied organometallic chemistry. Volume 33:Number 3(2019)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2018-12-27
• Subjects: flow technology -- gold nanoparticles -- halloysite nanotubes -- reduction reactions; Organometallic chemistry -- Periodicals; Organometallic compounds -- Periodicals; 547.05
• DOI: 10.1002/aoc.4665
• Languages: English
• ISSNs: 0268-2605

Abstract

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. Abstract : A highly sustainable prototype of a flow system based on gold nanoparticles supported on thiol functionalized halloysite was developed for catalytic applications. In the best experimental conditions impressive apparent turn over frequency value up to 2, 204, 530 h‐1 has been achieved and the halloysite based catalyst showed full recyclability even after ten cycles. With the application of flow technology, the obtained heterogeneous HNT@Au catalyst has been fully recovered and reused for at least one month.