CuAg and AuAg bimetallic nanoparticles for catalytic and heat transfer applications

Abstract

Bimetallic nanoparticles (BNPs) have drawn significant attention due to their numerous applications. They demonstrate enhanced optical, electrical, thermal, and catalytic properties due to the synergistic effects of monometals present in them. In this work, CuAg and AuAg BNPs have been synthesized using a facile and economical chemical reduction method. Optical characterization was carried out using UV–visible spectroscopy, and effect of pH on optical absorbance was studied. For CuAg and AuAg BNPs, optimum pH was observed to be at 9.4 and 6.39, respectively. Morphological investigation confirms the average diameters of CuAg and AuAg BNPs were to be 65 nm and 30 nm, respectively. Photocatalytic property illustrates the reduction of 4-nitrophenol to 4-aminophenol with a 92% conversion percentage in the presence of CuAg BNPs in 4 min, and rate constant for the reaction was measured to be 8.98 × 10–3 s−1. But for the AuAg BNPs, the conversion percentage was 97% in 8 min and rate constant was found to be 7.95 × 10–3 s−1. Thermal conductivity and viscosity measurements of the nanofluids obtained with CuAg and AuAg BNPs have ascertained them to be efficient candidates for the heat transfer and catalytic applications. Graphic abstract

State of the Art on Green Route Synthesis of Gold/Silver Bimetallic Nanoparticles

“…Moreover, an increase of the surface area with small sizes also improved their catalytic performance. Comparable results were reported by Dsouza and co-workers which described a 97% conversion of nitro to amino aromatic compound in 8 min by using Au/Ag BMNPs [ 48 ]. Ag@Au BMNPs prepared by a green procedure employing a polysaccharide extracted by mushroom Ramarai botrytis were also shown to possess high catalytic ability and to achieve a complete reduction of 4-NP to 4-aminophenol [ 49 ].…”

Ag–Cu Embedded SDS Nanoparticles for Efficient Removal of Toxic Organic Dyes from Water Medium

“…The removal potential of Ag–Cu nanoparticles was significantly higher up to 96.65% removal. This shows the efficacy of Ag–Cu BNPs as catalyst in the presence of NaBH 4 with this higher percentage to degrade the EY dye …”

“…This shows the efficacy of Ag−Cu BNPs as catalyst in the presence of NaBH 4 with this higher percentage to degrade the EY dye. 61 MB is a cationic thiazine (heterocyclic aromatic) dye having a wide range of applications in many industries and its massive amount is used in the textile industry. 62 The oxidized form of MB has a deep blue aqueous solution, while the reduced form (leuco form) has a colorless solution.…”

Microwave Synthesis of Trimesic acid capped silver nanofluids: Characterization and Catalytic Applications

“…Nano uids supported on Al 2 O 3 have been used as catalysts for the removal of 4 nitrophenol [6]. Cu -Ag and Au-Ag based bimetallic nanoparticle nano uids have been used for heat transfer and catalytic reduction of 4 nitrophenol [7].…”