Nanomaterial-based catalytic conversion of hazardous organic pollutants into benign substances is one of the green methods employed for wastewater treatment. This study demonstrates the fabrication of (rGO-ZnO)/CuO nanocomposites (NCs) via a microwave (MW)-assisted method for (photo)catalytic application. The crystal structure, …
The preparation of the CuO/ZnO heterojunction was schematic illustrated as shown in Fig. 1. A simple chemical solution strategy was then used to form Cu (OH) 2 /ZnO according to Eq. (1). (1) ZnO + CuCl 2 + H 2 O → ZnCl 2 + Cu OH 2 ↓. Download : Download high-res image (166KB) Download : Download full-size image.
Chemicals. Polylactic acid granules with 99% purity were prepared from the Khatam Polymer Company (Iran, Tehran). Copper oxide nanoparticles (with 99% purity, and particle size of 30–60 nm) and zinc oxide (with 99% purity, and particle size of 30–70 nm) were purchased from the Nanogiluzac Company (Iran, Tehran). 2, 2-Diphenyl-1 …
Fig. 1 shows the morphology images of pure ZnO and CuO/ZnO composites. It can be clearly seen from Fig. 1 (a) that the ZnO particles grown by thermal evaporation exhibit a tetrapod-shaped whisker morphology. After CuO and ZnO with different ratios are mixed together and ground, the tetrapod-shaped whiskers no longer exist; instead, …
This study investigated the removal of Cd2+, Cu2+, Ni2+, and Pb2+ from aqueous solutions with novel nanoparticle sorbents (Fe3O4, ZnO, and CuO) using a range of experimental approaches, including, pH, competing ions, sorbent masses, contact time, scanning electron microscopy, transmission electron microscopy, and X-ray diffraction. …
2.2 Synthesis of ZnO/CuO Nanocomposites The ZnO/CuO (in the ration of 1:1, 1:2, and 2:1) nano-composites were synthesized by CPT method using Cu(NO 3) 2⋅3H 2 O and Zn(NO 3) 2⋅6H 2 O precursors. These pre - cursors were dissolved in 100 mL deionized water to form a solution of 0.2 M concentration. Then, 0.2 M NaOH solu -
The electrons movement of ZnO/CuO NCs/GCE working electrode was estimated applying cyclic voltammetric (CV) analysis of 0.1 mM solution of Fe(CN) 6 3−/4-in 7.0 pH of phosphate buffer presenting in Fig. 4 (a). The oxidation and reduction peaks of modified GCE perceived at Fig. 4 (a) have seemed at +0.38 V and +0.10 V individually ...
Nanocomposites of CuO/ZnO nanotubes can be attained by dipping ZnO nanotubes into the solution. Glucose working electrode with nanostructures has higher surface-to-volume ratio and raises its sensitivity to the target substance. The CuO/ZnO nanotubes electrode has promoted its sensitivity to glucose up to 3.2 mAmM −1 cm −2. …
The synthesized (ZnO, CuO, and CuO/ZnO) nanomaterials were evaluated for photocatalytic activity using methylene blue () dye. Among all three photocatalysts, the composite showed maximum photodegradation compared to the other two materials.
A wireless carbon dioxide sensor was fabricated using ZnO/CuO and different ratios of ZnO/CuO/RGO (ZnO:CuO = 1:1 and ZnO:CuO = 2:1). It can be seen from Fig. 8 (b) that the carbon dioxide amplitude of the ZnO/CuO/RGO nanocomposite coating with the ratio of ZnO:CuO = 1:1 changes the most, which is 10.3 dB, while the …
ZnO–CuO nanocomposite exhibits significant photodegradation for methylene blue dye with 97.93% degradation efficiency. The obtained results confirm that ZnO–CuO nanocomposite shows effective antibacterial activity against human pathogens. In summary green synthesised ZnO–CuO nanocomposite can possibly be used in waste …
Fusarium species are considered one of the most destructing plant pathogens. In the current study, bimetallic zinc oxide-copper oxide nanoparticles (ZnO-CuO NPs) were myco-synthesized using Aspergillus fumigatus for controlling Fusarium oxysporum growth. Aspergillus fumigatus was isolated from soil and identified …
SEM pattern of ZnO, CuO/ZnO(1:2), CuO/ZnO(1:1) and CuO/ZnO(2:1). Besides, the element distribution on the surface of the catalyst was verified by energy dispersive X-ray spectroscopy (EDS). The element composition of CuO/ZnO(1:2) nano photocatalyst is shown in Fig. 3 (e-g), which confirms the existence of O, Zn, and Cu …
We can clearly see that the Nanord-like ZnO is evenly distributed on Nickel . Fig. 1b shows the image of ZnO/CuO with bilayer structure at a magnification of 2 μm, and we can see that ZnO Nanorods are wrapped by thin-film sheets of CuO.Fig. 1c and d shows the SEM images of ZnO/CuO/Au electrodes at different magnifications (5 nm …
The H δ+ and H δ -ions required for the catalytic process are provided by the homogeneous splitting of hydrogen at the promoter, usually zinc oxide (ZnO) [ 6 ]. Some research …
The synthesis of ZnO/CuO films on ITO substrate was realized in two steps, first ZnO was deposited electrochemically and then CuO nanoparticles were precipitated with help of …
ZnO@CuO Nanocomposites (NCPs) were synthesized using Achyranthes aspera plant's leaves extract with varying weight percents of 25, 50 and 75 of ZnO. The leaves extract was prepared using laboratory distilled water with the help of magnetic stirrer at a temperature of 60ᵒC. An appropriate amount of zinc nitrate and copper nitrate were …
In this work we have demonstrated a facile formation of CuO nanostructures on copper substrates by the oxidation of copper foil in ethylene glycol (EG) at 80 °C. On immersing a prepared CuO film into a solution containing 0.1 g Zn(acac)2 in 20 mL EG for 8 h, ZnO flower-like microstructures composed of hierarchical three-dimensional (3D) …
Besides that, the ZnO/CuO composite coatings (ZC) that ZnO as the bottom and the CuO/ZnO (CZ) that CuO as the bottom were also prepared following the same parameters as preparing the mono-coating of ZnO or CuO. The bigger changes were given to the co-sputtered ZnO&CuO (Z&C) coating. Since the Zn and Cu targets were …
Regarding the formation of the 3D flower-like ZnO–CuO nanocomposite, the schematic illustration of the formation mechanism is presented in Fig. 4, and the further discussion is proposed as follows.It is well known that shape control of the nanocrystals can be achieved by manipulating the growth kinetics [25], [26], [27].In the present case, the …
This article reviews the synthesis techniques of the CuO-ZnO nanocomposite and its morphology. Various practical applications of the CuO-ZnO nanocomposites have also …
CuONPs was produced as follows. Firstly, 2.5 g of Cu(CH 3 COO) 2 ·H 2 O were added in 10 mL of H 2 O with stirring at 80 °C. The AG leaf extract solution was kept at pH 7 using an alkaline solution. Then, 30 mL of AG solution was gradually dropwised into the Cu 2+ solution under continuously stirring at 80 °C. This process was prolonged …
Nanocomposites of CuO/ZnO nanotubes can be attained by dipping ZnO nanotubes into the solution. Glucose working electrode with nanostructures has higher surface-to …
2.2 Characterization of the CuO/ZnO nanocomposite films. The structural characterization of the obtained CuO/ZnO nanocomposite thin films was carried out by X-ray diffraction (Bruker D8 Advance Serie II, diffractometer using Cu-Kα radiation (λ = 1.540056 A°)).The samples were scanned in reflection mode in the range 25–80° in 2θ …
We propose the synthesis of β-triketonate complexes of Zn(II) and Cu(II) as precursors in the photo-deposition of ZnO films loaded with CuO, which are subsequently calcined at …
X-ray powder diffractometry (XRD), infrared spectroscopy (FTIR), and scanning electron microscopy (SEM) were used to characterize the structural and the chemical features of the nanoparticles. An average nanocrystallite size of 25–30 nm was obtained for ZnO and Cu0.05Zn0.95O and of 40 nm for CuO, as estimated by the …
There is a minor change in the XRD pattern of ZnO at low concentrations of CuO in C-1 (10% CuO). The peak of CuO in the XRD pattern of 10% CuO nanocomposites exists with very small intensity. When the concentration of CuO increased from 30% to 50%, the CuO peaks are visible at 2θ ≈ 29.35°, 38.75° and 48.55°.
A hybrid multi-shelled nanoparticles (a m-ZnO@CuO@Au NPs), based on copper-aided oxidative degradation of an amorphous zeolitic imidazolate frameworks (a m-ZIFs), is illustrated in Fig. S1.Firstly, a m-ZIFs in rhombic dodecahedral form was synthesized by directly mixing zinc nitrate aqueous solution with ICA methanolic solution …
ZnO-CuO/rGO nanocomposite, ZnO, and CuO nanoparticles had Rct values of 5.8, 7.9, 12, Ω and Rs values of 27.8, 65, and 53.3 Ω, respectively. The composite electrode materials have low Rs (27.8) and Rct (5.8) values, indicating that the ZnO.CuO nanoparticles are in close contact with the highly conductive rGO. The slope of the …
The chemical states of the compositional elements in CuO/ZnO nanocomposites were characterized by XPS as shown in Fig. 4.The survey XPS spectrum in the Fig. 4 (a) shows Zn, Cu, C, and O peaks which confirm that Cu, Zn, and O appeared at the surface of CuO/ZnO nanocomposites. For C1s neutral carbon peak at a binding …
2.2. In-situ growth of ZnO/CuO nanostructure on the graphene substrate. To grow the hierarchical ZnO/CuO@G nanostructure, the freshly prepared Zinc seed graphene substrate (S-ZnO@G) has been immersed in the freshly prepared copper contain solution (0.005 M in 85 mL of DDH 2 O) at room temperature for 1 h. The Zinc and copper seed …
