Bhaduri, KushanavaDas, Bidya DharKumar, RaweshMondal, SujanChatterjee, SauvikShah, SnehaBravo-Suárez, Juan J.Chowdhury, Biswajit2020-12-212020-12-212019-02-22Kushanava 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.8b03655https://hdl.handle.net/1808/30984Highly 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).Copyright © 2019 American Chemical SocietyTransfer reactionsMetal nanoparticlesGoldCatalystsCatalytic reactionsRecyclable Au/SiO2-Shell/Fe3O4-Core Catalyst for the Reduction of Nitro Aromatic Compounds in Aqueous SolutionArticle10.1021/acsomega.8b03655https://orcid.org/0000-0002-6484-374Xhttps://orcid.org/0000-0003-3257-2065openAccess