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Recyclable Au/SiO2-Shell/Fe3O4-Core Catalyst for the Reduction of Nitro Aromatic Compounds in Aqueous Solution.

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).

SUBMITTER: Bhaduri K 

PROVIDER: S-EPMC6649094 | biostudies-literature | 2019 Feb

REPOSITORIES: biostudies-literature

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Recyclable Au/SiO<sub>2</sub>-Shell/Fe<sub>3</sub>O<sub>4</sub>-Core Catalyst for the Reduction of Nitro Aromatic Compounds in Aqueous Solution.

Bhaduri Kushanava K   Das Bidya Dhar BD   Kumar Rawesh R   Mondal Sujan S   Chatterjee Sauvik S   Shah Sneha S   Bravo-Suárez Juan J JJ   Chowdhury Biswajit B  

ACS omega 20190222 2

Highly stable gold nanoparticles immobilized on the surface of amine-functionalized nanocomposite microspheres possessing a magnetite (Fe<sub>3</sub>O<sub>4</sub>) nanoparticle core and a silica (SiO<sub>2</sub>) shell (Au/SiO<sub>2</sub>-shell/Fe<sub>3</sub>O<sub>4</sub>-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 NaBH<sub>4</  ...[more]

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