Abstract
Redox reactions are of great importance in environmental catalysis. Gold nanoparticles (Au-NPs) have attracted much attention because of their catalytic activity and their localized surface plasmon resonance (LSPR). In the present study, we investigated, in detail, the reduction of ferricyanide (III) ion into a ferrocyanide (II) ion catalyzed by spherical gold nanoparticles of two different sizes, 15 nm and 30 nm, and excited at their LSPR band. Experiments were conducted in the presence (or absence) of sodium thiosulfate. This catalysis is enhanced in the presence of Au- NPs under visible light excitation. This reduction also takes place even without sodium thiosulfate. Our results demonstrate the implication of hot electrons in this reduction.
Highlights
Redox reactions are of great importance in environmental catalysis, such as, for example, the reduction of nitrogen oxides, CO2, or heavy metals, and the generation of hydrogen from water or oxidation of CO or organic pollutants [1]
We investigated in details the reduction of ferricyanide (III) ion into ferrocyanide (II) ion catalyzed by spherical Au-NPs and excited at their localized surface plasmon resonance (LSPR) band
We have investigated the catalytic properties of Au-NPs under plasmon excitation on the reduction of HC-FeIII in the presence or in the absence of the reducing sodium thiosulfate (ST)
Summary
Redox reactions are of great importance in environmental catalysis, such as, for example, the reduction of nitrogen oxides (deNOx), CO2 , or heavy metals, and the generation of hydrogen from water or oxidation of CO or organic pollutants [1]. Catalysis by gold has been a domain of increased interest since the discovery by Haruta [3] that small gold nanoparticles (Au-NPs) can catalyze CO reduction at room temperature [4,5,6,7,8,9]. There are many applications utilizing the SPR of gold nanoparticles, including subwavelength electromagnetic energy transport, chemical and biological sensors [1,6,10], surface enhanced Raman scattering (SERS) [11,12], plasmonic photocatalysis [13,14,15], and photothermal cancer therapy [16,17,18], where the plasmonic energy is converted locally into heat that raises the surrounding medium temperature, leading to the killing of cancer cells.
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