Naslov
Magnetic δ-FeOOH/Au nanostructures synthesized using γ-irradiation method and their catalytic activity for the reduction of 4-nitrophenol

Autori
Marić, Ivan ; Gotić, Marijan ; Pustak, Anđela ; Dražić, Goran ; Greneche, Jean-Marc ; Jurkin, Tanja

Izvornik
Applied surface science (0169-4332) 611 (2023); 155653, 18

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
Feroxyhyte/Au nanostructures ; Superparamagnetic nanoparticles ; Iron oxides ; Gamma-irradiation ; Catalytic activity ; 4-nitrophenol

Sažetak
γ-irradiation was used as an effective and environmentally friendly technique for the synthesis of magnetic iron oxide/Au nanostructures. Firstly, alkaline iron(III) precursor solutions, in the presence of 2-propanol and DEAE-dextran, were purged with nitrogen and γ- irradiated to doses of 14 and 75 kGy, which resulted in the reduction of Fe3+ to Fe2+ ions and formation of Fe(II)/Fe(III) or Fe(II) iron (hydr)oxide phases. After irradiation, gold nanoparticles (AuNPs) were attached to the surface of the magnetic nanostructures by in situ reduction of Au3+ with radiolytically formed Fe2+. At 75 kGy, simultaneous oxidation of Fe(OH)2 formed on irradiation and reduction of Au3+ led to the formation of superparamagnetic feroxyhyte (δ- FeOOH) nanodiscs decorated with well distributed, 11–24 nm AuNPs. The experiments performed with and without Fe(III) precursor and 2-propanol or tert- butanol as scavenger and in different atmospheres (N2, N2O) confirmed the main role of Fe2+ in Au3+ reduction. The catalytic activity of the δ- FeOOH/Au nanostructures was tested for the reduction of 4-nitrophenol to 4-aminophenol. Increasing the amount of added Au3+ enhanced the catalytic activity of the samples, but up to a certain amount depending on the size of formed AuNPs.

Izvorni jezik
Engleski

Znanstvena područja
Kemija

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