期刊
APPLIED ORGANOMETALLIC CHEMISTRY
卷 33, 期 3, 页码 -出版社
WILEY
DOI: 10.1002/aoc.4665
关键词
flow technology; gold nanoparticles; halloysite nanotubes; reduction reactions
资金
- University of Palermo
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 x 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.
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