Abstract
In this study, reduced graphene oxide (rGO)-supported noble metal (gold, silver, and platinum) nanoparticle catalysts were prepared via the one-pot facile co-reduction technique. Various measurement techniques were used to investigate the structures and properties of the catalysts. The relative intensity ratios of ID/IG in rGO/Au, rGO/Ag, rGO/Pt, and GO were 1.106, 1.078, 1.047, and 0.863, respectively. The results showed the formation of rGO and that noble metal nanoparticles were decorated on rGO. Furthermore, the catalytic activities of the designed nanocomposites were investigated via 4-nitrophenol. The catalysts were used in 4-nitrophenol reduction. The catalytic performance of the catalysts was evaluated using the apparent rate constant k values. The k value of rGO/Au was 0.618 min−1, which was higher than those of rGO/Ag (0.55 min−1) and rGO/Pt (0.038 min−1). The result proved that the rGO/Au catalyst exhibited a higher catalytic performance than the rGO/Ag catalyst and the rGO/Pt catalyst. The results provide a facile method for the synthesis of rGO-supported nanomaterials in catalysis.
Highlights
Noble metal NPs have been widely used in many applications, such as catalysis, optical, magnetic, biomedical, Raman, and other fields [4,5,6]
The small size of gold NPs on the reduced graphene oxide (rGO) surface may have contributed to the enhancement of the catalytic performance in the catalytic reduction reaction
According to the HRTEM results (Figure 1), the lattice spacings of the noble metal NPs are 0.234, 0.235, and 0.225 nm, which are related to the lattice plane (111) of gold [33], silver [34], and platinum, respectively [35]
Summary
Publisher’s Note: MDPI stays neutral with regard to jurisdictional claims in published maps and institutional affiliations. Nanoparticles (NPs) of noble metals (gold, silver, and platinum) have attracted greater interest from researchers than bulk metals because of their unique properties, such as electronic, optical, magnetic, and catalytic properties [1,2,3]. Noble metal NPs have been widely used in many applications, such as catalysis, optical, magnetic, biomedical, Raman, and other fields [4,5,6]. Organic pollutants from industrial waste have seriously affected the environment and human health; the removal of industrial waste has received great attention [7,8].
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