In the present paper, a novel composite Graphene–Gold (Gr–Au)/TiO2–SiO2 photocatalyst was synthesized and tested for the removal of methylene blue and rhodamine B in water solutions. First, Gr–Au nanoparticle composite was synthesized by simultaneous reduction and deposition of Au nanoparticles on Gr surface. The photodegradation of methylene blue and rhodamine B in aqueous solutions was studied using various photocatalysts, including neat TiO2–SiO2, Gr/TiO2–SiO2 and Gr–Au/TiO2–SiO2 composites. The Gr weight ratio in this research is 2% in the Gr/TiO2–SiO2 composites. Detailed characterization (field emission scanning electron microscope, Raman, Fourier transform infrared spectra and UV–vis absorbance spectroscopy) of such material was conducted. As a result, the uniform deposition of nanometer-sized Au NPs on the graphene sheets was observed. The Gr–Au/TiO2–SiO2 exhibited excellent photocatalytic efficiency because of the reduction of electron–hole recombination. The Gr2%–Au0.1%/TiO2–SiO2 composite had the highest photoactivity.

Enhancing the photocatalytic activity of TiO2 and TiO2–SiO2 by coupling with graphene–gold nanocomposites / Chinh, V. D.; Bavasso, I.; Di Palma, L.; Felici, A. C.; Scarsella, M.; Vilardi, G.; Bracciale, M. P.; Van, N. T.. - In: JOURNAL OF MATERIALS SCIENCE. MATERIALS IN ELECTRONICS. - ISSN 0957-4522. - 32:4(2021), pp. 5082-5093. [10.1007/s10854-021-05242-9]

Enhancing the photocatalytic activity of TiO2 and TiO2–SiO2 by coupling with graphene–gold nanocomposites

Bavasso I.;Di Palma L.;Felici A. C.;Scarsella M.;Vilardi G.;Bracciale M. P.;
2021

Abstract

In the present paper, a novel composite Graphene–Gold (Gr–Au)/TiO2–SiO2 photocatalyst was synthesized and tested for the removal of methylene blue and rhodamine B in water solutions. First, Gr–Au nanoparticle composite was synthesized by simultaneous reduction and deposition of Au nanoparticles on Gr surface. The photodegradation of methylene blue and rhodamine B in aqueous solutions was studied using various photocatalysts, including neat TiO2–SiO2, Gr/TiO2–SiO2 and Gr–Au/TiO2–SiO2 composites. The Gr weight ratio in this research is 2% in the Gr/TiO2–SiO2 composites. Detailed characterization (field emission scanning electron microscope, Raman, Fourier transform infrared spectra and UV–vis absorbance spectroscopy) of such material was conducted. As a result, the uniform deposition of nanometer-sized Au NPs on the graphene sheets was observed. The Gr–Au/TiO2–SiO2 exhibited excellent photocatalytic efficiency because of the reduction of electron–hole recombination. The Gr2%–Au0.1%/TiO2–SiO2 composite had the highest photoactivity.
2021
nanoparticles; photocatalysis; TiO2; sustainable-process
01 Pubblicazione su rivista::01a Articolo in rivista
Enhancing the photocatalytic activity of TiO2 and TiO2–SiO2 by coupling with graphene–gold nanocomposites / Chinh, V. D.; Bavasso, I.; Di Palma, L.; Felici, A. C.; Scarsella, M.; Vilardi, G.; Bracciale, M. P.; Van, N. T.. - In: JOURNAL OF MATERIALS SCIENCE. MATERIALS IN ELECTRONICS. - ISSN 0957-4522. - 32:4(2021), pp. 5082-5093. [10.1007/s10854-021-05242-9]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/1541555
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