RSC Adv
Catalysis and Surface Chemistry Lab, Chemistry Department, Faculty of Science, Assiut University Assiut 71516 Egypt
Published: June 2022
In this work, Cu NPs were loaded at a fixed percentage (5 wt%) on 1D, (1D + 0D) and 0D ZnO nanostructures to investigate the effect of the support morphology on the reduction of organic pollutants in water. The synthesized materials were characterized by high-resolution transmission electron microscopy (HR-TEM), ultraviolet-visible spectroscopy (UV-Vis), Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), N adsorption-desorption and X-ray photoelectron spectroscopy (XPS). The results reveal that the loading of Cu NPs decreases the optical band gap, and a slight change in the crystallite sizes increases the specific surface area value of the nanocomposites. The TEM images reveal that 1D ZnO has an average width of 44.7 nm and an average length of 211 nm, while 0D ZnO has an average diameter of 54.5 nm. The HR-TEM and XPS data confirm the loading of metallic Cu NPs on the surface of the ZnO nanostructures. The pure ZnO and nanocomposites were tested for 4-nitrophenol (4-NP) reduction in the presence of NaBH at room temperature. The obtained results show that pure ZnO nanostructures have no catalytic performance, while the nanocomposites showed good catalytic activities. The catalytic reduction efficiency of 4-NP was found to follow the order of Cu/0DZnO > Cu/(1D + 0D)ZnO > Cu/1DZnO. The complete reduction of 4-NP has been observed to be achievable within 60 s using the Cu/0DZnO nanocomposite, with a value of 8.42 min and good recyclability of up to five cycles. This nanocomposite was then applied in the reduction of organic dyes in water; it was found that the reduction rate constants for the methylene blue, Congo red, and acriflavine hydrochloride dyes were 1.4 min, 1.2 min, and 3.81 min, respectively. The high catalytic performance of this nanocomposite may be due to the small particle size, high specific surface area, and the high dispersion of Cu NPs on the surface of ZnO.
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http://dx.doi.org/10.1039/d2ra02515a | DOI Listing |
J Vis Exp
December 2024
Department of Cell Biology, School of Life Sciences, Central South University;
The aqueous extract from the bark of Eucommia ulmoides serves as a rich source of bioactive compounds with numerous health benefits. The protocol here aims to explore the preparation of zinc oxide (ZnO) nanoparticles using the Eucommia ulmoides bark-mediated polyisoprene-rich aqueous extract. Meanwhile, the proposed protocol is associated with the preparation of wound healing material by easing the process.
View Article and Find Full Text PDFSci Rep
January 2025
Environment Division, National Institute of Oceanography and Fisheries (NIOF), Kayet Bey, Elanfoushy, Alexandria, Egypt.
Sci Rep
January 2025
Special Centre for Nanoscience, Jawaharlal Nehru University, New Delhi, 110067, India.
Excess consumption of antibiotics leads to antibiotic resistance that hinders the control and cure of microbial diseases. Therefore, it is crucial to monitor the antibiotic levels in the environment. In this proposed research work, an optical nano-sensor was devised that can sense the ultra-low concentration of antibiotics, in samples like tap water using fluorescent zinc oxide quantum dots (ZnO QDs) based nano-sensor.
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January 2025
Department of Physics, National Institute of Technology Nagaland, Chumukedima, Dimapur 797103, India.
An exceedingly porous and interwoven fibrous structure was achieved in this study by interlocking titanium carbide (TiC) MXenes onto the electrospun mats using poly(vinylidene fluoride) (PVDF) as the base polymer. The fibrous membrane was further modified with the inclusion of zinc oxide (ZnO) and tungstite (WO·HO) nano/microstructures via annealing and hydrothermal approaches. Through these strategic interfaced morphological developments in novel TiC/ZnO/WO·HO heterostructures, our findings reveal enhanced wettability and charge-segregation desirable for promoting oil-water separation and photoreactivity, respectively.
View Article and Find Full Text PDFJ Biomed Mater Res A
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PRISM Research Institute, Technological University of the Shannon: Midlands Midwest, Athlone, Ireland.
This study provides a comprehensive investigation of antimicrobial additives (ZnO/AgNPs and SiO/AgNPs) on the properties of biodegradable ternary blends composed of poly(hydroxybutyrate) (PHB), poly(lactic acid) (PLA), and polycaprolactone (PCL) by examining the morphology, thermal stability, crystallinity index, and cell viability of these blends. Overall, transmission electron microscopy (TEM) analysis revealed that AgNPs and SiO exhibited comparable sizes, whereas ZnO was significantly larger, which influences their release profiles and interactions with the blends. The addition of antimicrobials influences the rheology of the blends, acting as compatibilizers by reducing the intermolecular forces between biopolymers.
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