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- Title
Enhancing the photocatalytic activity of TiO2 and TiO2–SiO2 by coupling with graphene–gold nanocomposites.
- Authors
Chinh, Vu Duc; Bavasso, Irene; Di Palma, Luca; Felici, Anna Candida; Scarsella, Marco; Vilardi, Giorgio; Bracciale, Maria Paola; Van, Nguyen Thuy
- 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.
- Subjects
FIELD emission electron microscopes; NANOCOMPOSITE materials; ELECTRON-hole recombination; GOLD nanoparticles; METHYLENE blue; RHODAMINE B; TITANIUM dioxide; PHOTOCATALYSTS
- Publication
Journal of Materials Science: Materials in Electronics, 2021, Vol 32, Issue 4, p5082
- ISSN
0957-4522
- Publication type
Article
- DOI
10.1007/s10854-021-05242-9