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Recyclable Au/SiO2-Shell/Fe3O4-Core Catalyst for the Reduction of Nitro Aromatic Compounds in Aqueous Solution
Bhaduri, Kushanava Das, Bidya Dhar Kumar, Rawesh Mondal, Sujan Chatterjee, Sauvik Shah, Sneha Bravo-Suárez, Juan J. Chowdhury, Biswajit
Bhaduri, Kushanava
Das, Bidya Dhar
Kumar, Rawesh
Mondal, Sujan
Chatterjee, Sauvik
Shah, Sneha
Bravo-Suárez, Juan J.
Chowdhury, Biswajit
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Abstract
Highly stable gold nanoparticles immobilized on the surface of amine-functionalized nanocomposite microspheres possessing a magnetite (Fe3O4) nanoparticle core and a silica (SiO2) shell (Au/SiO2-shell/Fe3O4-core) were prepared. These gold nanocomposite catalysts were tested for 4-nitrophenol (4-NP) and 2-nitroaniline (2-NA) reduction in aqueous solution in the temperature range 293–323 K and in the presence of aqueous NaBH4 reducing agent. The magnetically recyclable gold catalyst showed high stability (∼3 months), efficient recyclability (up to 10 cycles), and high activity (∼100% conversion within 225 s, ∼700 ppm 4-NP or 2-NA). The pseudo-first-order apparent reaction rate constants (k) of 4-NP and 2-NA reduction were 7.5 × 10–3 and 4.1 × 10–3 s–1, respectively, and with an apparent catalytic activity of 4.48 × 10–8 kmol/(m3 s).
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Date
2019-02-22
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Publisher
American Chemical Society
Research Projects
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Keywords
Transfer reactions, Metal nanoparticles, Gold, Catalysts, Catalytic reactions
Citation
Kushanava Bhaduri, Bidya Dhar Das, Rawesh Kumar, Sujan Mondal, Sauvik Chatterjee, Sneha Shah, Juan J. Bravo-Suárez, and Biswajit Chowdhury
ACS Omega 2019 4 (2), 4071-4081
DOI: 10.1021/acsomega.8b03655