Details

Autor(en) / Beteiligte

• Atout, Hicham
• Bouguettoucha, Abdellah
• Chebli, Derradji
• Crespo, Julián
• Dupin, Jean-Charles
• López-de-Luzuriaga, José M
• Martínez, Hervé
• Monge, Miguel
• Olmos, M. Elena
• Rodríguez-Castillo, María

Titel

An improved plasmonic Au-Ag/TiO/rGO photocatalyst through entire visible range absorption, charge separation and high adsorption ability

Ist Teil von

• New journal of chemistry, 2021-07, Vol.45 (26), p.11727-11736

Erscheinungsjahr

2021

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• Small size AuAg colloidal nanoparticles (AuAg NPs) are prepared through the mild decomposition of the organometallic precursor [Au 2 Ag 2 (C 6 F 5 ) 4 (OEt 2 ) 2 ] n in THF, using polyvinylpyrrolidone (PVP) as the stabilizing polymer. These nanoparticles are directly deposited on the surface of TiO 2 NPs through impregnation in solution at RT or under hydrothermal conditions. AuAg-TiO 2 -rGO (rGO = reduced graphene oxide) hybrid nanostructures are also prepared under hydrothermal reduction of graphene oxide. The obtained nanomaterials have been characterized through XRD, TEM, HRTEM, solid state UV/vis, Raman and XPS. The use of the nanomaterials as plasmonic photocatalysts under visible white LED light and sunlight is studied and the possible mechanisms of the catalytic degradation of methylene blue (MB) are proposed. The localized surface plasmon resonance (LSPR) displayed by the spherical AuAg nanoparticles enhances their ability of visible light absorption, whereas graphene nanosheets provide a very efficient charge carrier separation, allowing a good performance of the photocatalysts under low-power white LED sources or sunlight. Plasmonic nanohybrids for visible light absorption: the combination of small alloyed AuAg NPs, TiO 2 NPs and rGO nanosheets provides wide visible light absorption improving the photocatalytic efficiency towards water pollutant remediation.