Synthesis Of Air Stable Copper Nanoparticles And Their Use In Catalysis

Abstract

The undertaken study describes synthesis of air resistant copper nanoparticles (Cu NPs) in an aqueous phase using sodium borohydride as a reducing agent via chemical reduction method. The hydrosol has resistant to oxidation by atmospheric oxygen for several days. The air stability was induced by capping Cu NPs with anionic surfactant "sodium dodecyl sulfate (SDS)". Ascorbic acid was used as an antioxidant. These Cu NPs were characterized by ultraviolet-visible (UV-VIS) spectroscopy, which contributed towards the understanding of surface plasmon resonance (SPR) generation and optical behavior of Cu NPs. It was used as an optical tracer for size control and confirmation of Cu NPs and was found to be affected by various parameters like reaction time, pH, concentration of copper sulfate and the surfactant SDS. SPR peaks were found to shift from 597 to 569 nm, while apparent color changes from yellow to brick red. Further characterization studies were carried out by using fourier transform infrared (FT-IR) spectroscopy to investigate the co-ordination between Cu NPs and SDS. X-ray diffraction (XRD) was used for phase purity of Cu NPs. Transmission electron microscopy (TEM) and atomic force microscopy (AFM) were used the size and morphological characterization. The average size of the Cu NPs was found to be 15 nm in diameter with an average height of 14 nm. The Cu NPs showed excellent catalytic activity in the reductive degradation of Eosin B (EB) dye in just 16 sec of reaction time and maintained their catalytic activity when reused multiple times. The degradation rate was found to follow first order reaction kinetics with the EB degradation. The Cu NPs enhanced the rate of EB degradation 30 times more than the control test. Copper was found an attractive catalyst in the nanosize regimes. The Cu NPs are more economical as compared to noble metals. The Cu NPs are expected to be suitable alternative and play an imperative role in the fields of catalysis and environmental remediation.

Optimization Properties and Characterization of Green Synthesis of Copper Oxide Nanoparticles Using Aqueous Extract of Cordia myxa L. Leaves

“…Variations in pH were highly affected the SPR of CuONPs. Moreover, the influence of pH on the proceed of reduction reaction has also been reported by many literatures [26,27]. As shown in Fig.…”

Antibacterial Behavior of Laser-Ablated Copper Nanoparticles

“…2. Figure 2 shows the absorption peak at 591 and 589 nm for 1000 and 1500 shots, respectively, which proves the formation of the Cu NPs in the solution [12,25].…”

“…On the other hand, one diffraction peak was indexed to cuprous oxide (Cu 2 O) having a corresponding peak (220) at 2h value of 60.5°. The presence of Cu 2 O indicates the partial oxidation of Cu NPs with dissolved oxygen in the solution [25,26]. These oxides, which are members of copper compounds family, also attribute to antibacterial mechanism and potential advantage in dental industry.…”

“…The toxicity of Cu NPs depends on several factors, such as concentration of nanoparticles, size of particle and concentration of bacteria [21,25]. The experimental conditions selected were those that yielded best dose-response curve.…”

Yeast-derived biosynthesis of silver/silver chloride nanoparticles and their antiproliferative activity against bacteria

“…3 NPs have a large surface area to volume ratio, which makes them particularly useful for catalytic and microbicide purposes, in industrial settings. [4][5][6][7] Currently, metallic NPs are produced by reducing noble metals such as silver, 1 gold, 8 copper, 9 zinc 10 and titanium, 11 among others.…”