Abstract:There are few methods to obtain uniform and well dispersed cuprous oxide nanoparticles, which limits its application widely. In this research, an improved method to prepare nanoparticles was introduced. Cuprous oxides were prepared by the reduction of cupric nitrate, with hydrazine hydrate as a reductant in the presence of glucose. The nanoparticles formed have the characteristics of small particle size and uniform distribution. The crystalline structure and morphological characteristics were analyzed by XRD a… Show more
“…By using the Debye-Scherrer equation, the average crystalline size of CuO NPs is 22 nm. The findings were intimately associated with the results for nanoparticles of cuprous oxide (Shi et al, 2019).…”
Nitrite (NO2−) and nitrate (NO3−) are frequently used in cured meat products as preservatives, as they give a better taste and work well in color fixation. As a key possible carcinogen, excessive dietary consumption of NO2− in cured meat products would be bad for health. Herein, copper oxide nanoparticles (CuO NPs) were synthesized using the drug Augmentin as a reducing and capping agent. The desired synthesis of CuO NPs was confirmed by various characterization techniques, including UV–visible spectroscopy, Fourier transform infrared spectroscopy, energy-dispersive X-ray spectroscopy, thermal gravimetric analysis, X-ray diffraction, and scanning electron microscopy. The new approach of drug-mediated acetic acid-capped CuO NPs was developed for simple colorimetric detection of nitrite ions in a mimic solution of processed food. The color of the detection system changes from brown to yellow with the increase in the concentration of NO2− and has been observed with the naked eye. The selectivity of the NO2− detection system by the UV–visible spectrum and the naked eye is compared to other ions, such as Br−, I−, Cl−1, PO4−3, CO32−, and SO42−. The platform was successfully employed for the determination of nitrite in real samples. Moreover, this probe can be used for the sensitive detection of NO2− with a linear range of 1 × 10−8 to 2.40 × 10−6 M, a detection limit of 2.69 × 10−7 M, a limit of quantification 8.9 × 10−7 M, and a regression coefficient (R2) of 0.997. Our results suggest that this sensor can be used for on-site analysis and quantification as well as in the fields of disease diagnosis, environmental monitoring, and food safety.
“…By using the Debye-Scherrer equation, the average crystalline size of CuO NPs is 22 nm. The findings were intimately associated with the results for nanoparticles of cuprous oxide (Shi et al, 2019).…”
Nitrite (NO2−) and nitrate (NO3−) are frequently used in cured meat products as preservatives, as they give a better taste and work well in color fixation. As a key possible carcinogen, excessive dietary consumption of NO2− in cured meat products would be bad for health. Herein, copper oxide nanoparticles (CuO NPs) were synthesized using the drug Augmentin as a reducing and capping agent. The desired synthesis of CuO NPs was confirmed by various characterization techniques, including UV–visible spectroscopy, Fourier transform infrared spectroscopy, energy-dispersive X-ray spectroscopy, thermal gravimetric analysis, X-ray diffraction, and scanning electron microscopy. The new approach of drug-mediated acetic acid-capped CuO NPs was developed for simple colorimetric detection of nitrite ions in a mimic solution of processed food. The color of the detection system changes from brown to yellow with the increase in the concentration of NO2− and has been observed with the naked eye. The selectivity of the NO2− detection system by the UV–visible spectrum and the naked eye is compared to other ions, such as Br−, I−, Cl−1, PO4−3, CO32−, and SO42−. The platform was successfully employed for the determination of nitrite in real samples. Moreover, this probe can be used for the sensitive detection of NO2− with a linear range of 1 × 10−8 to 2.40 × 10−6 M, a detection limit of 2.69 × 10−7 M, a limit of quantification 8.9 × 10−7 M, and a regression coefficient (R2) of 0.997. Our results suggest that this sensor can be used for on-site analysis and quantification as well as in the fields of disease diagnosis, environmental monitoring, and food safety.
“…However, to this end, only few precious metals such as silver and gold are recovered from the PCBs, whereas most of the base metals being of lesser economical values are left as such which eventually ends up in landfills. ,− One such metal is Cu, which also happens to be in major proportion as compared to other metals in PCBs. − Recently, a lot of efforts have been advocated to trap this metal and put back in recycling loop, and therefore many laboratories have reported processes related to its recovery. − Cu, apart from having applications in the electronic industry as a conductive metal, have recently shown huge potential in various futuristic technologies if produced in the form of nanoparticles (NPs) . Copper oxide nanoparticles, commonly referred to as CuO NPs, have shown quite unique physicochemical properties, e.g., electron correlation effects and spin dynamics, narrow band gaps, extremely high surface areas, and unusual crystal morphologies, and therefore have found immense application in various advance fields, like catalysts in rocket propellants, antifouling material in ship hulls and submarines, semiconductive materials in the electronic industry, electrode materials for batteries, catalysis, sensors, antiviral and antibacterial materials for public safety, especially during pandemics, etc. Therefore, there exists huge potential in selectively recovering Cu from e-waste and its transformation to CuO NPs for high-end applications.…”
Section: Introductionmentioning
confidence: 99%
“…11−15 Cu, apart from having applications in the electronic industry as a conductive metal, have recently shown huge potential in various futuristic technologies if produced in the form of nanoparticles (NPs). 16 Copper oxide nanoparticles, commonly referred to as CuO NPs, have shown quite unique physicochemical properties, e.g., electron correlation effects and spin dynamics, narrow band gaps, extremely high surface areas, and unusual crystal morphologies, and therefore have found immense application in various advance fields, like catalysts in rocket propellants, 17 antifouling material in ship hulls and submarines, 18 semiconductive materials in the electronic industry, 19 electrode materials for batteries, 20 catalysis, 21 sensors, 22 antiviral and antibacterial materials 23 for public safety, especially during pandemics, etc. Therefore, there exists huge potential in selectively recovering Cu from e-waste and its transformation to CuO NPs for highend applications.…”
Recycling of metals from end-of-life products (urban mining) has been one of the major targets of long-term environment management, which becomes impressively rewarding if it culminates in the production of technologically significant materials. To this end, a process has been developed for selective separation and recovery of copper (Cu) from printed circuit boards (PCBs) with a novel iminodiacetamide (IDA) resin and its direct upcycling to copper oxide nanoparticles (CuO NPs), which has found immense applications in various futuristic fields such as rocket propellants, semiconductors, battery electrode materials, antifouling agents in ships, antiviral/antibacterial materials, etc. Briefly, depopulated PCBs were first treated chemically for maximum leaching of Cu in aqueous medium (leach liquor). IDA resin was then used for selective separation and recovery of Cu from the acidic leach liquor, with very high loading capacity ∼ 70 mg/g of Cu. Finally, the quantitative recovery of Cu from the stripping solution of IDA resin and direct conversion to CuO NPs (purity >99.5%) were achieved, confirmed through SEM−EDX and XRD techniques. This work thus reports the first full transformation of copper from electronic scraps to high-value material CuO NPs.
“…Many types of nanoparticles and their derivatives, including metal and metal oxide nanoparticles such as silver (Ag), silver oxide (Ag 2 O), titanium dioxide (TiO 2 ), silicon (Si), copper oxide (CuO), zinc oxide (ZnO), gold (Au), calcium oxide (CaO), and magnesium oxide (MgO), illustrate the important role for antimicrobial activity . Among several metal and metal oxide nanoparticles, copper-based nanoparticles have been receiving particular attention to employ as antimicrobial materials (registered at the U.S. Environmental Protection Agency (EPA) in 2008) due to low costs of the material source and a wide spectrum of antimicrobial activity against different species of microbes. − Noticeably, copper(I) oxide or cuprous oxide (Cu 2 O) as one of copper oxide forms has attracted considerable interest due to its outstanding properties such as its low energy band gap (2.18 eV), photocatalytic and catalytic power, and broad spectrum of antibacterial activity. − Several previous works reported that Cu 2 O compounds provided better antiviral efficacy over cupric oxide (CuO). They have been demonstrated to effectively inhibit influenza, hepatitis C virus (HCV), herpes simplex virus (HSV), feline calicivirus (FCV), and bacteriophages on solid-state surfaces and in solution. − Recently, Cu 2 O has attracted much attention from many scientists because it can be employed in smart antiviral materials against severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2).…”
The high antibacterial and antiviral performance of synthesized copper(I) oxide (Cu 2 O) incorporated in zeolite nanoparticles (Cu-Z) was determined. Various Cu contents (1−9 wt %) in solutions were loaded in the zeolite matrix under neutral conditions at room temperature. All synthesized Cu-Z nanoparticles showed high selectivity of the cuprous oxide, as confirmed by X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS) analysis. An advantage of the prepared Cu-Z over the pristine Cu 2 O nanoparticles was its high thermal stability. The 7 and 9 wt % Cu contents (07Cu-Z and 09Cu-Z) exhibited the best activities to deactivate Gram-negative Escherichia coli and Grampositive Staphylococcus aureus bacteria. The film coated with 07Cu-Z nanoparticles also had high antiviral activities against porcine coronavirus (porcine epidemic diarrhea virus, PEDV) and severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2). Specifically, the 07Cu-Z-coated film could reduce 99.93% of PEDV and 99.94% of SARS-CoV-2 viruses in 5 min of contact time, which were higher efficacies and faster than those of any previously reported works. The anti-SARS-CoV-2 virus film was coated on a low-cost PET or PVC film. A very small amount of cuprous oxide in zeolite was used to fabricate the antivirus film; therefore, the film was more transparent (79.4% transparency) than the cuprous oxide film or other commercial products. The toxicity of 07Cu-Z nanoparticles was determined by a toxicity test on zebrafish embryo and a skin irritation test to reconstruct a human epidermis (RhE) model. It was found that the impact on the aquatic environment and human skin was lower than that of the pristine Cu 2 O.
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