Abstract
Exploring solar-excited heterogeneous photocatalysts by taking advantage of surface plasmon resonance (SPR) has drawn growing research attention. As it could help to pave the way for global sustainable development. The decoration of TiO2 particles with noble metals possessing SPR effects is regarded as one of the most effective solutions. The perfect match of the SPR absorption band with the spectrum of incident light is an essential factor for plasmonic enhancement. However, modifying with sole noble metal is often limited as it tunes wavelength of only several nanometers. To overcome this drawback, an alternative approach can be offered by decoration with more than one noble metal. For instance, Au-Ag co-decoration displays greatly adjustable, composition-dependent SPR agent over a broad range of the visible light spectrum (ca. from 415 to 525 nm). Hence Au-Ag complex is a remarkable candidate for tuning the photo adsorption of TiO2 from UV to visible light. This study presents a novel and tailored method for the fabrication of Au-Ag co-modified TiO2 particles, and how Au-Ag dependent SPR was applied as the visible light-responsive TiO2 based photocatalysts in a simple but reliable way. The fabricated Au-Ag co-decorated TiO2 (AuxAg(1−x)/TiO2) was characterized and proved to own excellent stability and large specific surface area. The optimization of these particles against the wavelength of maximal solar light intensity was confirmed by photo degradation of methylene blue under visible light radiation. This work may provide further insight into the design of TiO2-based composites with improved photocatalytic properties for environmental remediation and renewable energy utilization.
Highlights
As the first reported photocatalyst, TiO2 has received extensive attention owing to its strong photo oxidization capacity and excellent long-term stability [1]
This study reports a tailored synthetic method to prepare Au-Ag binary nanoparticles and their resulting surface plasmon resonance (SPR) properties can be applied to produceTiO2 -based photocatalysts with SPR at specific, desired visible light wavelengths in a straightforward way
TiO2 was fixed to an optimized value (2.25 wt%), which was determined in our preliminary study
Summary
As the first reported photocatalyst, TiO2 has received extensive attention owing to its strong photo oxidization capacity and excellent long-term stability [1]. A number of strategies have been reported to extend its adsorption range into the visible light spectrum by changing the bandgap of semiconductors, including replacing O atom in TiO2 with C or N [7,8], doping with metal element, such as Sb and V [9,10], decorating with other metal oxides [11,12], or preparing hydrogenated black-TiOx structures [13]. The resulting particles were highly monodispersed and had a particle size from 6 to 13 nm [33] They adjusted the size as well as the SPR frequency by changing the ratios of the metals added and by changing the surfactants used. This study reports a tailored synthetic method to prepare Au-Ag binary nanoparticles and their resulting SPR properties can be applied to produceTiO2 -based photocatalysts with SPR at specific, desired visible light wavelengths in a straightforward way.
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