Sunlight Photocatalytic Performance of ZnO Nanoparticles Synthesized by Green Chemistry Using Different Botanical Extracts and Zinc Acetate as a Precursor
Abstract:In this work, the assessment of Azadirachta indica, Tagetes erecta, Chrysanthemum morifolium, and Lentinula edodes extracts as catalysts for the green synthesis of zinc oxide nanoparticles (ZnO NPs) was performed. The photocatalytic properties of ZnO NPs were investigated by the photodegradation of methylene blue (MB) dye under sunlight irradiation. UV-visible (UV-Vis) spectroscopy, Fourier Transform Infrared (FTIR) spectroscopy, Transmission Electron Microscopy (TEM), X-ray Diffraction (XRD), Thermogravimetri… Show more
“…2c). In general, the morphological study revealed the small particle size and high surface area of the nanoparticles, which matches the results obtained from XRD and most of the literature [30,31].…”
Background
The present work aims to investigate the ultrastructural changes in the fat body of fifth nymphal instars Schistocerca gregaria (Orthoptera: Acrididae) treated with zinc chromium oxide (ZnCrO).
Methodology:
The nanoparticles (NPs) were prepared by a coprecipitation approach. X-ray diffraction (XRD), energy dispersive X-ray spectroscopy (EDX), scanning electron microscopy (SEM), and transmission electron microscopy (TEM) were employed to investigate the structural, composition, and morphological properties.
Results and discussion
The ZnCrO NPs exhibited a hexagonal polycrystalline structure. SEM and TEM micrographs described the surface nature of the nanoparticles composed of spherical and hexagonal shapes with an average size of ~25 nm. The energy gap (Eg)of the Cr-doped ZnO thin film was estimated from the transmittance and reflectance spectra to be 3.307 and 3.840 eV. In biological sections, TEM images demonstrated that the fat body strongly impacted with the concentrations 2mg of the treated nanoparticles caused great agglomerated chromatin in the nucleus as well as haemoglobin cells (HGCs) pierced with malformed trachea. In addition, the same effect was observed at 1mg on the 7th day post treatment
Conclusion
The results indicate a positive impact of ZnCrO on Schistocerca gregaria leads to malformed of fat body organelles.
“…2c). In general, the morphological study revealed the small particle size and high surface area of the nanoparticles, which matches the results obtained from XRD and most of the literature [30,31].…”
Background
The present work aims to investigate the ultrastructural changes in the fat body of fifth nymphal instars Schistocerca gregaria (Orthoptera: Acrididae) treated with zinc chromium oxide (ZnCrO).
Methodology:
The nanoparticles (NPs) were prepared by a coprecipitation approach. X-ray diffraction (XRD), energy dispersive X-ray spectroscopy (EDX), scanning electron microscopy (SEM), and transmission electron microscopy (TEM) were employed to investigate the structural, composition, and morphological properties.
Results and discussion
The ZnCrO NPs exhibited a hexagonal polycrystalline structure. SEM and TEM micrographs described the surface nature of the nanoparticles composed of spherical and hexagonal shapes with an average size of ~25 nm. The energy gap (Eg)of the Cr-doped ZnO thin film was estimated from the transmittance and reflectance spectra to be 3.307 and 3.840 eV. In biological sections, TEM images demonstrated that the fat body strongly impacted with the concentrations 2mg of the treated nanoparticles caused great agglomerated chromatin in the nucleus as well as haemoglobin cells (HGCs) pierced with malformed trachea. In addition, the same effect was observed at 1mg on the 7th day post treatment
Conclusion
The results indicate a positive impact of ZnCrO on Schistocerca gregaria leads to malformed of fat body organelles.
“…ZnO has excellent chemical stability because of its hexagonal wurtzite structure at normal temperatures leading to a large Coulomb force for its positive and negative electron pairs [1]. ZnO is environmentally friendly, inexpensive, and abundant in nature and intrinsic defects such as oxygen vacancies or Zn interstitials are mostly on the surface of ZnO causing visible emissions [2,3]. All these unique properties make ZnO application in the ultraviolet (UV) and blue source and have efficient exciton emission [4].…”
ZnO and cerium-doped ZnO on a glass substrate have been prepared by the sol–gel method using the spin coating technique and water bath growth process. Ce-doping concentration on film structure, morphology, and optical properties is investigated. The result indicated that the hexagonal wurtzite ZnO with high crystalline quality formed on the substrate. The crystal parameters a and c decreased, crystal size increased, and the compressive strain formed after Ce-doping. Formed un-, 3%, 6%, 12% Ce-doped ZnO film has a spherical shape with a size between 8.6–31, 14–52, 18–56, and 20–91 nm, respectively. All films had good absorption of 300–400 nm ultraviolet light, in particular, the absorption of near ultraviolet (370–400 nm) increased after doping of Ce. The transmittance of light between 400–800 nm decreased with Ce-doping concentration. The band gap energy increased after Ce-doping reaching better optical behavior for preparing ZnO heterostructured thin-film. All film emitted intense blue emission under 375 nm excitation at room temperature. This indicated the film can have application in optoelectronic devices.
The present work aims to investigate the ultrastructural changes in the fat body of fifth instar nymphs Schistocerca gregaria (Orthoptera: Acrididae) treated with zinc chromium oxide (ZnCrO). The nanoparticles (NPs) were prepared by co-precipitation route and characterized using X-ray diffraction (XRD), energy dispersive X-ray spectroscopy (EDX), scanning electron microscopy (SEM), and transmission electron microscopy (TEM). The ZnCrO NPs exhibited polycrystalline hexagonal structure, composed of spherical–hexagonal shapes with an average size ~ 25 nm. Besides, the UV–Vis spectrophotometer (Jasco-V-570) was utilized for optical measurements. The energy gap $$\left( {{\text{E}}_{{\text{g}}} } \right)$$
E
g
was estimated from the transmittance (T%) and reflectance (R%) spectra through the range of 3.307–3.840 eV. In biological sections, S. gregaria 5th instar nymphs, TEM images demonstrated that the fat body was strongly impacted with the concentration 2 mg NPs result in great agglomeration of chromatin in the nucleus as well as haemoglobin cells (HGCs) pierced with malformed trachea (Tr) at 5th and 7th days post treatment. The obtained results indicated a positive action of the prepared nanomaterial on Schistocerca gregaria fat body organelles.
Graphical Abstract
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