Au and AuCu Nanoparticles Supported on SBA-15 Ordered Mesoporous Titania-Silica as Catalysts for Methylene Blue Photodegradation.
Isabel Barroso-MartínElisa MorettiAldo TalonLoretta StoraroEnrique Rodríguez CastellónAntonia Infantes-MolinaPublished in: Materials (Basel, Switzerland) (2018)
The photocatalytic degradation of methylene blue (MB) dye has been performed under UV irradiation in aqueous suspension, employing photocatalysts based on Au (1.5 wt %) and AuCu (Au/Cu = 1, 2.0 wt %), and supported on SBA-15-ordered mesoporous silica, with and without titania (Si/Ti = 3), in order to evaluate the versatility of this mesoporous support in this type of reaction of great impact from the environmental point of view. Samples were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), N₂ adsorption-desorption at -196 °C, and X-ray photoelectron spectroscopy (XPS), so as to study their structural, optical, and chemical properties. All the prepared catalysts were found to be active in the test reaction. The bimetallic AuCu-based catalysts attained very high MB degradation values, in particular AuCu/SBA-15 titania-silica sample reached 100% of dye oxidation after the monitored reaction period (120 min).
Keyphrases
- electron microscopy
- visible light
- highly efficient
- metal organic framework
- high resolution
- aqueous solution
- sensitive detection
- reduced graphene oxide
- electron transfer
- transition metal
- single molecule
- magnetic resonance imaging
- computed tomography
- risk assessment
- room temperature
- human health
- radiation therapy
- nitric oxide
- magnetic resonance
- gold nanoparticles
- quantum dots
- hydrogen peroxide
- solid state