This work presents a study on the effects of different peel extract weight percentages in the biosynthesis of zinc oxide (ZnO) for its application in the photocatalysis. Zinc nitrate was used as a ...source of the zinc ions, while
Lycopersicon esculentum
(tomato) contributed the peels for the extracts to be used as a reductant and stabilizing agent. The synthesized samples were studied and characterized through Fourier transform infrared spectroscopy, X-ray diffraction, scanning electron microscopy, high resolution transmission electron microscopy and UV–Vis spectroscopy. The morphology of the surface of the material showed that samples vary in size and shape distribution depending on the amount of extract used. The band gap values were of 3.08, 3.1 and 3.18 eV for the 1, 2 and 4% concentrations, respectively. The photocatalytic properties of the ZnO were evaluated through methylene blue degradation and the results presented a 97% dye degradation in 150 min, which is more efficient than comparable commercial ZnO.
This work addresses low cost, non-toxic green synthesis of Zinc Oxide nanoparticles prepared using different amounts of Camellia sinensis extract. The Synthesized material was studied and ...characterized through Fourier transform infrared spectroscopy (FTIR), x-ray diffraction (XRD), transmission electron microscopy (TEM). The Zinc Oxide nanoparticles presented the desired ZnO bond at 618 cm−1, demonstrated growth in a purely hexagonal Wurtzite crystal structure, and, depending on the amount of extract used, they presented different size and shape homogeneity. The photocatalytic activity of the obtained Zinc Oxide nanoparticles was studied. The photocatalytic degradation studies were done at a 1:1 M ratio of methylene blue to Zinc Oxide nanoparticles under UV light. The obtained results presented a better degradation rate than commercially available Zinc Oxide nanoparticles.
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•Green synthesis of ZnO nanoparticles present a spherical form.•The samples showed hexagonal Wurtzite crystal structure.•Particle size dependent on Camellia sinensis extract amount.•The photocatalytic activity of ZnO showed degradation of 100%.
We present the discovery and characterization of a new transiting planet from Campaign 17 of the Kepler extended mission K2. The planet K2-292 b is a warm sub-Neptune on a 17 day orbit around a ...bright (V = 9.9 mag) solar-like G3 V star with a mass and radius of M⋆ = 1.00 ± 0.03 M⊙ and R⋆ = 1.09 ± 0.03 R⊙, respectively. We modeled simultaneously the K2 photometry and CARMENES spectroscopic data and derived a radius of Rp=2.63−0.10+0.12 R⊕ $R_{\mathrm{p}} = 2.63_{-0.10}^{+0.12}\,{R_{\oplus}}$ Rp=2.63−0.10+0.12 R⊕ and mass of Mp=24.5−4.4+4.4 M⊕ $M_{\mathrm{p}} = 24.5_{-4.4}^{+4.4}\,{M_{\oplus}}$Mp=24.5−4.4+4.4 M⊕ , yielding a mean density of ρp=7.4−1.5+1.6 g cm−3 $\rho_{\mathrm{p}} = 7.4_{-1.5}^{+1.6}\,\mathrm{g\,cm^{-3}}$ρp=7.4−1.5+1.6 g cm−3 , which makes it one of the densest sub-Neptunian planets known to date. We also detected a linear trend in the radial velocities of K2-292 ( γ˙RV = −0.40−0.07+0.07 m s−1 d−1 $\dot{\gamma}_{\textrm{RV}}= -0.40^{+0.07}_{-0.07}\,\mathrm{m\,s^{-1}\,d^{-1}}$γ˙RV=−0.40−0.07+0.07 m s−1 d−1 ) that suggests a long-period companion with a minimum mass on the order of 33 M⊕. If confirmed, it would support a formation scenario of K2-292 b by migration caused by Kozai-Lidov oscillations.
•ZnO nanoparticles were biosynthesized with Hibiscus sabdariffa extract.•Biosynthesis of ZnO nanoparticles presented a hexagonal Wurtzite crystal structure.•The values of the band gap decreased from ...2.96 to 2.77 eV as the concentration of extract increased.•Particle size depends on Hibiscus sabdariffa extract amount.•The photocatalytic activity showed an approximate 100% MB degradation.
This work evaluates the effects of different concentrations of Hibiscus sabdariffa flower (Jamaica) extracts on the green synthesis of zinc oxide (ZnO), for the photocatalytic degradation of methylene blue (MB). Zinc nitrate is used for the synthesis of ZnO as a source of the zinc ions. Extracts of 1%, 4% and 8% (% weight-volume) of Hibiscus sabdariffa, in an aqueous medium, were used as reducing and stabilizing agents. In FTIR characterization, the ZnO bond was observed at 618 cm−1. By means of XRD, the material was observed to have a hexagonal crystalline phase (Wurzite). Through XPS, the energy values of 1022 eV for Zn and 531 eV for O were observed, showing the chemical state of Zn+2. The morphology of the ZnO nanoparticles (NPs) varies in its semicircular shape and size distributions depending on the extract used, which range from 30 to 8 nm. The values of the band gap decreased from 2.96 to 2.77 eV as the concentration of extract increased. These materials presented good photocatalytic activity, degrading 97% of MB in 150 min, which are efficient results comparable to ZnO NPs green synthesized via other extracts and other methods.
Martos J, Bassotto APS, González‐Rodríguez MP, Ferrer‐Luque CM. Dissolving efficacy of eucalyptus and orange oil, xylol and chloroform solvents on different root canal sealers. International ...Endodontic Journal, 44, 1024–1028, 2011.
Aim To evaluate the solubility of five root canal sealers in orange oil, eucalyptol, xylol and chloroform solvents.
Methodology The solubility of RoekoSeal, Sealer 26, Epiphany, Endomethasone and EZ‐Fill sealers was assessed in orange oil, eucalyptol, xylol, chloroform and distilled water. Seventy‐five samples of root canal sealers were prepared and then divided into five groups for immersion in solvent for 2, 5 or 10 min. The means of loss weight were determined for each material in each solvent at all immersion periods, and the values were compared by factorial analysis of variance (anova) and SNK multiple comparisons.
Results In the orange and eucalyptus oil groups, there was no significant difference among RoekoSeal, Sealer26, Epiphany and EZ‐Fill at the three immersion periods (P > 0.05). With xylol, no significant differences were found at 5 and 10 min (P > 0.05) for each root sealer. Orange and eucalyptus oil solvents were as effective as chloroform at 2 min in dissolving all the root sealers.
Conclusions Xylol was the most effective solvent followed by the chloroform and the essential oils (eucalyptol and orange oil). Orange oil behaved in a similar way to eucalyptus oil.
The aim of the current work was to evaluate a potential pharmacokinetic interaction between the flukicide triclabendazole (TCBZ) and the broad-spectrum benzimidazole (BZD) anthelmintic oxfendazole ...(OFZ) in sheep. To this end, both an in vitro assay in microsomal fractions and an in vivo trial in lambs parasitized with Haemonchus contortus resistant to OFZ and its reduced derivative fenbendazole (FBZ) were carried out. Sheep microsomal fractions were incubated together with OFZ, FBZ, TCBZ, or a combination of either FBZ and TCBZ or OFZ and TCBZ. OFZ production was significantly diminished upon coincubation of FBZ and TCBZ, whereas neither FBZ nor OFZ affected the S-oxidation of TCBZ towards its sulfoxide and sulfone metabolites. For the in vivo trial, lambs were treated with OFZ (Vermox® oral drench at a single dose of 5 mg/kg PO), TCBZ (Fasinex® oral drench at a single dose of 12 mg/kg PO) or both compounds at a single dose of 5 (Vermox®) and 12 mg/kg (Fasinex®) PO. Blood samples were taken to quantify drug and metabolite concentrations, and pharmacokinetic parameters were calculated by means of non-compartmental analysis. Results showed that the pharmacokinetic parameters of active molecules and metabolites were not significantly altered upon coadministration. The sole exception was the increase in the mean residence time (MRT) of OFZ and FBZ sulfone upon coadministration, with no significant changes in the remaining pharmacokinetic parameters. This research is a further contribution to the study of metabolic drug-drug interactions that may affect anthelmintic efficacies in ruminants.
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•Strategies to overcome parasite disease include the use of chemotherapeutic agents.•Chemotherapeutic agents can be combined to expand the spectrum of efficacy.•One such combination is nematodicidal oxfendazole and flukicidal triclabendazole.•Interactions arising from this combination have not yet been assayed.•The presence of triclabendazole increased the mean residence time of oxfendazole.
ABSTRACT
We report on the precise radial velocity follow-up of TOI-544 (HD 290498), a bright K star (V = 10.8), which hosts a small transiting planet recently discovered by the Transiting Exoplanet ...Survey Satellite (TESS). We collected 122 high-resolution High Accuracy Radial velocity Planet Searcher (HARPS) and HARPS-N spectra to spectroscopically confirm the transiting planet and measure its mass. The nearly 3-yr baseline of our follow-up allowed us to unveil the presence of an additional, non-transiting, longer-period companion planet. We derived a radius and mass for the inner planet, TOI-544 b, of 2.018 ± 0.076 R⊕ and 2.89 ± 0.48 M⊕, respectively, which gives a bulk density of $1.93^{+0.30}_{-0.25}$ g cm−3. TOI-544 c has a minimum mass of 21.5 ± 2.0 M⊕ and orbital period of 50.1 ± 0.2 d. The low density of planet-b implies that it has either an Earth-like rocky core with a hydrogen atmosphere, or a composition which harbours a significant fraction of water. The composition interpretation is degenerate depending on the specific choice of planet interior models used. Additionally, TOI-544 b has an orbital period of 1.55 d and equilibrium temperature of 999 ± 14 K, placing it within the predicted location of the radius valley, where few planets are expected. TOI-544 b is a top target for future atmospheric observations, for example with JWST, which would enable better constraints of the planet composition.
In this work, the synthesis of zinc oxide (ZnO) nanoparticles was made using an eco-friendly methodology with a natural extract. The fruit of tejocote (Crataegus mexicana) was used as a stabilizing ...agent for synthesizing zinc oxide nanoparticles (NPs). Once the NPs were obtained, diverse characterization techniques were used to determine the physicochemical and optical properties of the ZnO NPs; the ultraviolet–visible spectroscopy was used to determine the uv absorption spectra of ZnO NPs and the bandgap of the material, the FT-IR spectrum of the ZnO NPs shows the presence of the Zn–O bond at 560 cm−1, XRD results show that the ZnO NPs exhibit a hexagonal crystal structure zincite type, the SEM confirms slight agglomerations between nanoparticles, Also from TEM results, the nanoparticles present a quasi-spherical morphology with sizes ranging from 18.25 nm to 36.88 nm, indicating an influence of the concentration of the Crataegus mexicana extract in the synthesis process of ZnO NPs. Photoluminescence spectroscopy of ZnO NPs shows strong emission bands in the visible spectrum around 425 nm, 467 nm, and 492 nm, and weak emission bands in the UV spectrum were observed. Finally, a photocatalytic study was realized for the photodegradation of 5 pollutant dyes: methylene blue (MB), malachite green (MG), congo red (CR), rhodamine b (RB), and methyl orange (MO). The results show degradation of the organic dyes after 180 min by a photodegradation process where ZnO nanoparticles act as a photocatalyst, indicating that the synthesized ZnO nanoparticles have excellent photocatalytic properties.
•ZnO NPs were synthesized using Crataegus mexicana extract as a stabilizing agent.•The bandgap of the ZnO NPs showed values between 3.0 and 3.07 eV.•All samples present ZnO nanoparticles with a zincite-type hexagonal structure.•The photocatalytic test showed excellent results for hazardous dyes.
•ZnO nanoparticles were biosyntehsized with Justicia spicigera extract.•The crystallite size and homogeneity was influenced by the amount of extract used.•The values of the band gap increased as the ...concentration of extract increased.•Particle size depends on Justicia spicigera extract amount.•The photocatalytic activity presented 90% of MB degradation within 120 min.
This paper presents an easy and simple green route method for the biosynthesis of ZnO nanoparticles, which were synthesized using Justicia spicigera extract, in different concentrations (1, 2, 4 and 8% in weight-volume). The samples were characterized by Fourier Transform Infrared (FT-IR) and Visible Ultraviolet Spectrometry (UV-vis) spectrophotometric techniques, furthermore complemented with the use of X-ray Diffraction (XRD), Scanning (SEM) and Transmission Electron Microscopy (TEM). Finally, the different catalysts were tested for the degradation of methylene blue under ultraviolet light. The samples presented the typical band of the Zn-O bond at 618 cm−1. UV-vis studies revealed a characteristic signal at 373-376 nm, confirming the formation of ZnO nanoparticles. The different samples manifest the same hexagonal crystal structure, Wurtzite. These materials have a semi-spherical morphology and sizes ranging from 10 to 100 nm. Regarding photocatalytic activity, the catalysts degraded close to 90% of the dye in 120 min.
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In order to meet the growing demand for new technologies, new materials with improved electrical, electronic, and electrochemical properties are needed. In the present work, the biosynthesis of zinc ...oxide nanoparticles was carried out with the aid of
Tilia
extract, varying the amount of extract used to obtain unique properties. The amounts of extract used were 1, 2, and 4% (volume ratio of water/weight of
Tilia
). The nanoparticles were characterized by FTIR, TEM, XRD, UV–Vis, and EIS. The analyses revealed that the nanoparticle composition includes organic material components from the
Tilia
extract. The average sizes shown by the nanoparticles were 41.8, 38.5, and 33.2 nm. XRD analyses determined that the nanoparticles have a hexagonal structure with a Wurtzite phase and crystallite sizes of 30.97 nm for 1%, 28.62 nm for 2%, and 14.52 nm for 4%. For the optical properties, the band gap values of the samples were 2.80, 2.64, and 2.47 eV for 1, 2, and 4%, respectively. Due to these characteristics, the obtained nanoparticles presented outstanding electrochemical properties that could benefit optoelectronic devices.
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