A facile synthesis of Cu–CuO–Ag nanocomposite and their hydrogenation reduction of p-nitrophenol

Abstract

In this study, a nanocatalyst of Cu-CuO-Ag was synthesized by a facile chemical reduction method. By varying the amount of metallic precursor, different compositions of the Cu-CuO-Ag nanocomposite were synthesized, and their structural and morphological characterizations were carried out. The nanocomposites were used for the hydrogenation reduction of p-nitrophenol to p-aminophenol using sodium borohydride as the reducing agent. The catalytic activity of Cu-CuO-Ag nanocomposite had a catalytic activity that was 4.5 fold higher than that of Cu-CuO nanocomposite. The kinetic studies revealed pseudo-first order kinetics and the reduction reaction completed within four minutes. The maximum rate constant value of 0.565 min −1 was obtained for the composite prepared with a copper precursor to silver precursor ratio of 16:1. The developed Cu-CuO-Ag nanocomposite also showed excellent catalytic stability. There was no noticeable decrease in catalytic activity even after four cycles. Furthermore, we optimized the catalyst amount required for the reduction reaction.

Gamma radiation-induced synthesis of novel PVA/Ag/CaTiO3 nanocomposite film for flexible optoelectronics

“…The diffraction pattern of Ag/CaTiO 3 shows the characteristic diffraction peaks of Ag nanoparticles NPs, which correspond to (111), (200), (220), (311), (222) planes of the cubic structure of Ag [ICDD file: 01-071-4612], indicating that the Ag NPs were successfully loaded on the surface of CaTiO 3 38 . The highly intense peaks of Ag NPs are due to the high amount of free silver in the composite 39 . A slight shift in the diffraction peaks of CaTiO 3 toward lower angles was observed; this could be attributed to the internal stress arising from the loading of Ag NPs to the lattice 40 .…”

Furo, Pyrano, and Pyrido[2,3‐d]Pyrimidines: A Comprehensive Review of Synthesis and Medicinal Applications

“… Efficiency : Nano CuO−Ag has been found to be an efficient catalyst for various reactions. The nanoparticles possess a high surface‐to‐volume ratio, which improves their activity and selectivity [63] Reusability : Nano CuO−Ag can be reused multiple times without significant loss of activity, making it a cost‐effective choice for catalysis [64] …”

“…Versatility : Nano CuO−Ag has been used effectively in various applications, including the degradation of pollutants, the reduction of nitrophenols, and the synthesis of flavanones [63] …”

“…It offers a sustainable and inexpensive alternative to conventional catalysis [65] Versatility : Nano CuO−Ag has been used effectively in various applications, including the degradation of pollutants, the reduction of nitrophenols, and the synthesis of flavanones [63] Speed : Reactions catalyzed by nano CuO−Ag have been found to complete within a short time, indicating the high efficiency of this catalyst [66] …”

“…Efficiency : Nano CuO−Ag has been found to be an efficient catalyst for various reactions. The nanoparticles possess a high surface‐to‐volume ratio, which improves their activity and selectivity [63] …”