Abstract
Bimetallic gold-silver nanoparticles as unique catalysts were prepared using seed colloidal techniques. The catalytic capabilities of the nanoparticles were ascertained in the reduction of 4-nitrophenol to 4-aminophenol in the presence of sodium borohydride. Our results clearly showed that the rate of 4-NP reduction to 4-AP increased with a corresponding decrease in the diameter of the bimetallic NPs. The Au-Ag nanoparticles prepared with 5.0 mL Au seed volume indicated higher reduction activity, which was approximately 1.2 times higher than that of 2.0 mL Au seed volume in the reductive conversion of 4-NP to 4-AP. However, the monometallic NPs showed relatively less catalytic activity in the reductive conversion of 4-NP to 4-AP compared to bimetallic Au-Ag nanoparticles. Our studies also reinforced the improved catalytic properties of the bimetallic Au-Ag nanoparticles structure with a direct impact of the size or diameter and relative composition of the bimetallic catalytic nanoparticles.
Highlights
In the recent years, bimetallic nanoparticles (NPs) have received the increased attention of the researchers due to their excellent optical, magnetic, electronic, and catalytic properties compared to their individual analogues [1]
The second reaction we studied here is the presence of NaBH4 and nanocatalysts
NPs influenced the catalytic properties of the Au-Ag NPs
Summary
Bimetallic nanoparticles (NPs) have received the increased attention of the researchers due to their excellent optical, magnetic, electronic, and catalytic properties compared to their individual analogues [1]. Colloidal synthesis is one of the most commonly used, because it offers a great variety of options for composition, size, crystal structure, shape, and surface chemistry control due to the flexibility in selecting the reaction system and synthesis condition [26,27]. This method takes advantage of surface catalysis [28]. This method does not require expensive equipment but can be used to produce nanoparticles in a liquid dispersion, which is the desirable form for many applications [26]
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