scholarly journals Chemical Route Manufactured ZnO Nanoparticles And Their Biological Accumulation

2021 ◽  
Author(s):  
M. Bouloudenine ◽  
H. Laala-Bouali ◽  
K. Djeddou ◽  
M. Bououdina ◽  
N. Grara
Keyword(s):  
Fine Particles ◽  
Annealing Treatment ◽  
Hexagonal Wurtzite Structure ◽  
Optical Quality ◽  
Precipitation Method ◽  
Nanocrystalline Powder ◽  
Zno Nps ◽  
Chemical Route ◽  
Co Precipitation ◽  
The Impact

Abstract ZnO nanocrystalline powder was successfully synthesized via co-precipitation method coupled with high annealing treatment. X-ray diffraction analysis revealed that the NPs have a pure hexagonal wurtzite structure with a mean crystallite size of approximately 59 nm. FESEM observations along with EDS analysis indicated the formation of fine particles in the nanoscale regime, with hexagonal shape and high purity. Both Raman and photoluminescence characterizations confirmed the high crystalline and the optical quality of the synthesized ZnO NPs. The assessment of the impact of ZnO-based nanoparticles and their effects on body and bioaccumulative bioindicators of pollution, Helix aspersa snails was performed in order to preserve the safe development of nanotechnology.

scholarly journals Morphology and structure study of polygon ZnO nanorods: Biomedical applications

2021 ◽  
Vol 3 (1) ◽  
pp. 125-132
Author(s):  
Parastoo Khalili ◽  
◽  
Majid Farahmandjou ◽  
Keyword(s):  
Electron Microscopy ◽  
Zno Nanorods ◽  
Hexagonal Wurtzite Structure ◽  
Structure Study ◽  
Precipitation Method ◽  
Zno Nps ◽  
Sem Images ◽  
Tem Analysis ◽  
Exact Size ◽  
Co Precipitation

In this study, zinc oxide (ZnO) nanoparticles (NPs) were first synthesized using co-precipitation method in the presence of Zn(NO3)2.6H2O precursor and calcined at different temperature of 450 oC and 1000 oC. Samples were then characterized by x-ray diffraction (XRD), transmission electron microscopy (TEM), energy dispersive spectroscopy (EDS) and scanning electron microscopy (SEM). The XRD study revealed the hexagonal wurtzite structure for annealed samples. SEM images showed tthat he morphology of the ZnO NPs changed from sphere-like shape to polygon shape by increasing temperature. The exact size of NPs were measured by TEM analysis about 40 nm for as-prepared samples. The EDS analysis demonstrated an increasing level of Zn element from 28.5 wt% to 50.8 wt% for as-synthesized and annealed samples, respectively.

Structural Properties of Cu-Doped ZnO Prepared by Coprecipitation Method

2021 ◽  
Vol 1028 ◽  
pp. 90-95
Author(s):  
Kharisma Noor Afifah Supoyo ◽  
Mohammad Syaiful Anwar ◽  
Retno Asih ◽  
Malik Anjelh Baqiya ◽  
Prae Chirawatkul ◽  
...  
Keyword(s):  
Structural Properties ◽  
Hexagonal Wurtzite Structure ◽  
Host Lattice ◽  
Precipitation Method ◽  
Zno Nanoparticle ◽  
X Ray ◽  
As Doping ◽  
Refinement Method ◽  
Co Precipitation ◽  
X Ray Absorption

An experimental study to determine the effect of Cu doping on structural properties of ZnO nanoparticle has been conducted. Zn1-xCuxO (CZO) were prepared by co-precipitation method by varying Cu concentration with x = 0.00, 0.10, 0.11 and 0.12. The structural properties of the CZO sample were characterized by X-Ray diffraction (XRD) and X-ray Absorption Spectroscopy (XAS), which consist of XANES (X-ray Absorption Near-Edge Spectroscopy) and EXAFS (Extended X-ray Absorption Fine Structure). XAS measurements were performed in the energy of Cu K-edge and Zn K-edge using synchrotron radiation at SLRI (Synchrotron Light Research Institute) in Thailand. Both Cu K-edge and Zn K-edge XANES spectra indicate that the oxidation states of Cu and Zn ions are 2+. Analysis of XRD data with refinement method using Rietica software confirms the presence of Cu as doping in ZnO host lattice with the crystallite size ranging between 26 and 44 nm. Moreover, it shows that the obtained CZO samples are polycrystalline with (002) predominant reflection and exhibit a hexagonal wurtzite structure.

Catalytic Hydrolysis of Hydrogen Cyanide on Cu-Al Catalyst

2015 ◽  
Vol 1094 ◽  
pp. 15-19
Author(s):  
Lin Xia Yan ◽  
Sen Lin Tian ◽  
Qiu Lin Zhang
Keyword(s):  
Calcination Temperature ◽  
Hydrogen Cyanide ◽  
Influence Factor ◽  
Ph Value ◽  
Precipitation Method ◽  
Molar Ratio ◽  
Cu Content ◽  
Co Precipitation ◽  
The Impact ◽  
Hydrolysis Of

Cu-Al catalysts were synthesized by the co-precipitation method to study hydrolysis of hydrogen cyanide. During the synthesis, the impact of Cu/Al molar ratio, pH value and calcination temperature was investigated and the best synthesis condition was found. The results indicate that the remove of hydrogen cyanide first increases and then decreases with increasing Cu/Al molar ratio, pH value and calcination temperature, which reaches the maxima and remains above 95% at 360 min when Cu/Al molar ratio is 2:1, pH value is approximately 8.0 and calcination temperature is 400°C around. The analysis of X-ray diffraction (XRD) shows that Cu content is the main influence factor at Cu/Al molar ratio below 2:1 whereas crystallinity of catalysts is the key factor at Cu/Al molar ratio above 2:1.

scholarly journals Effect of Iron Oxide Nanoparticles on the Properties of Water-Based Drilling Fluids

Energies ◽  
2020 ◽  
Vol 13 (24) ◽  
pp. 6718
Author(s):  
Muhammad Awais Ashfaq Alvi ◽  
Mesfin Belayneh ◽  
Sulalit Bandyopadhyay ◽  
Mona Wetrhus Minde
Keyword(s):  
Iron Oxide ◽  
Coefficient Of Friction ◽  
Drilling Fluid ◽  
Precipitation Method ◽  
Fluid Loss ◽  
Drilling Fluids ◽  
The Coefficient Of Friction ◽  
Filtrate Loss ◽  
Co Precipitation ◽  
The Impact

In recent years, several studies have indicated the impact of nanoparticles (NPs) on various properties (such as viscosity and fluid loss) of conventional drilling fluids. Our previous study with commercial iron oxide NPs indicated the potential of using NPs to improve the properties of a laboratory bentonite-based drilling fluid without barite. In the present work, iron oxide NPs have been synthesized using the co-precipitation method. The effect of these hydrophilic NPs has been evaluated in bentonite and KCl-based drilling fluids. Rheological properties at different temperatures, viscoelastic properties, lubricity, and filtrate loss were measured to study the effect of NPs on the base fluid. Also, elemental analysis of the filtrate and microscale analysis of the filter cake was performed. Results for bentonite-based fluid showed that 0.019 wt% (0.1 g) of NPs reduced the coefficient of friction by 47%, and 0.0095 wt% (0.05 g) of NPs reduced the fluid loss by 20%. Moreover, for KCl-based fluids, 0.019 wt% (0.1 g) of additive reduced the coefficient of friction by 45%, while higher concentration of 0.038 wt% (0.2 g) of NPs shows 14% reduction in the filtrate loss. Microscale analysis shows that presence of NPs in the cake structure produces a more compact and less porous structure. This study indicates that very small concentration of NPs can provide better performance for the drilling fluids. Additionally, results from this work indicate the ability of NPs to fine-tune the properties of drilling fluids.

Free-standing ultrathin CoMn2O4 nanosheets anchored on reduced graphene oxide for high-performance supercapacitors

2015 ◽  
Vol 44 (43) ◽  
pp. 18737-18742 ◽  
Author(s):  
Guoxin Gao ◽  
Shiyao Lu ◽  
Yang Xiang ◽  
Bitao Dong ◽  
Wei Yan ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
High Performance ◽  
Annealing Treatment ◽  
Trisodium Citrate ◽  
Precipitation Method ◽  
Free Standing ◽  
Post Annealing ◽  
Reduced Graphene ◽  
Co Precipitation

Free-standing ultrathin CoMn2O4 nanosheets are successfully assembled on reduced graphene oxide via a simple trisodium citrate (TSC) assisted co-precipitation method with a post-annealing treatment.

scholarly journals Effect of silver doping on structural and photocatalytic circumstances of ZnO nanoparticles

2020 ◽  
pp. 13-20
Author(s):  
Luma Ahmed ◽  
Eitemad S. Fadhil ◽  
Ayad F. Mohammed
Keyword(s):  
Zno Nanoparticles ◽  
Precipitation Method ◽  
Methyl Green ◽  
Zno Nanoparticle ◽  
Zno Nps ◽  
Force Microscopy ◽  
Ft Ir ◽  
Doped Zno ◽  
Co Precipitation ◽  
Artificial Uv

This article describes the synthesis of ZnO nanoparticles (Nps) using the co-precipitation method and then calcinated at 500oC for 2 h. The photo activity of ZnO nanoparticles was examined in photo decolorization of methyl green dye under artificial UV -A light. This prepared photocatalyst (ZnO Np) was modified his surface by 2% Ag doped using the photo deposition method under inert gas for 3h. The characterization of undoped and 2% Ag doped ZnO Nps were estimated by Fourier-transform infrared spectroscopy (FT-IR), X-ray Diffraction (XRD), and Atomic force microscopy (AFM). In FT-IR analysis, the new peaks occurred around 624-778 cm-1 confirmed the Ag really is doped on prepared ZnO Np. Based on data from XRD, the mean crystal size was reduced with doped the 2% Ag. The AFM images for the prepared photocatalysts ensure that the shapes of all samples are semi-spherical with nanometer size. Series of kinetics experiments were performed for the photocatalytic decolourization of methyl green dye using undoped and 2% Ag doped ZnO nanoparticle and found to be pseudo-first-order kinetics.

scholarly journals Variation in the material properties by nickel substitution in copper tellurate

2020 ◽  
Author(s):  
Sudarshana Dhanarath Mardolkar ◽  
A. V. Salker
Keyword(s):  
Visible Region ◽  
Photoluminescence Property ◽  
Precipitation Method ◽  
Magnetic Studies ◽  
Dielectric Parameters ◽  
Chemical Route ◽  
Wide Range ◽  
Lower Temperature ◽  
Co Precipitation ◽  
First Time

Abstract A series of pristine and nickel doped copper tellurates possessing a wide range of applications are studied here. Use of a simple wet chemical route that is co-precipitation method has been employed for the first time, which involves the formation of desired compounds at a relatively lower temperature, thus modifying their properties. All the prepared compounds are characterized and investigated by XRD, TG – DTA, XPS, SEM, TEM to examine their phase purity, thermal stability, chemical state, and microstructural properties. The electrical resistivity studies showed an insulator - semiconductor transition behavior. Magnetic studies revealed the paramagnetic nature of the material. Antiferromagnetic to paramagnetic transition was observed at T N ~ 60 K in case of Cu 2.7 Ni 0.3 TeO 6 sample. Thermoelectric studies indicated a change in conduction mechanism with temperature. Dielectric properties with respect to frequency showed an increase in dielectric parameters with increasing dopant content. Photoluminescence property has been studied and found to show emission in the visible region.

scholarly journals Metal Based-oxide Nanoparticles Assisted the Uptake of the Essential Elements and Phytoremediation of Populus Alba : Essential Metabolic Processes and Genetic Stability

2021 ◽  
Author(s):  
Mohamed F. Ahmed ◽  
Mostafa A. Ibrahim ◽  
Ahmed S. Mansour ◽  
Ahmed N. Emam ◽  
Ashraf B. Abd El-Razik ◽  
...  
Keyword(s):  
Metal Oxides ◽  
Chemical Properties ◽  
Essential Elements ◽  
Precipitation Method ◽  
Populus Alba ◽  
Root Number ◽  
Zno Nps ◽  
Significant Difference ◽  
Co Precipitation ◽  
And Control

Abstract The present study evaluated the phytoremediation activities of Populus alba upon using nano metal-based-oxides (i.e., Fe2O3, ZnO, and Mn2O3-NPs) as analogues of three main heavy metals Fe, Zn and Mn exist in soil as micronutrients at three different concentrations (i.e., 20, 40, and 60 mg/L) compared to the control. The as-prepared nanoparticles have been prepared via co-precipitation method. In addition, the physico-chemical properties were investigated using transmission electron microscopy, Fourier transform infrared spectra, X-ray diffraction and dynamic light scattering techniques. Overall, a significant difference in the biomass production-related parameters such as fresh weight, shoot length, root length, and root number compared to control upon the treatment with micronutrients-based nano-metal-oxides (i.e., Mn2O3 > Fe2O3 > ZnO NPs, respectively), except a significant increase in the root number of Populus alba plant upon their treatment with ZnO NPs compared to other prepared nano-metal-oxides and control. Also, a remarkable increase in the chlorophyll index was monitored upon treatment with Fe2O3 than other used Mn2O3 and ZnO NPs, respectively. Moreover, RAPD-PCR bioassays were applied and the actual 6 primers showed a genetic variation percentage of 34.17% indicating that Populus alba is highly genetically stable even in a highly contaminated environment/soil. All these data enhance the idea of using the Populus alba plant in phytoremediation and heavy metal uptake as micronutrients to clean up the surroundings.

scholarly journals Insecticidal effects of zinc oxide nanoparticles and Beauveria bassiana TS11 on Trialeurodes vaporariorum (Westwood, 1856) (Hemiptera: Aleyrodidae)

2016 ◽  
Vol 107 (2) ◽  
pp. 299 ◽  
Author(s):  
Zahra KHOOSHE-BAST ◽  
Najmeh Sahebzadeh ◽  
Mansour GHAFFARI-MOGHADDAM ◽  
Ali MIRSHEKAR
Keyword(s):  
Zinc Oxide ◽  
Beauveria Bassiana ◽  
Zinc Oxide Nanoparticles ◽  
Hexagonal Wurtzite Structure ◽  
Trialeurodes Vaporariorum ◽  
Precipitation Method ◽  
Infrared Analysis ◽  
Oxide Nanoparticles ◽  
Zno Nps ◽  
Greenhouse Whitefly

<p><em></em>Greenhouse whitefly,<em> Trialeurodes vaporariorum</em> is a major pest of horticultural and ornamental plants and is usually controlled with insecticides or biological control agents. In the current study, we examined the effects of synthesized zinc oxide nanoparticles (ZnO NPs) and <em>Beauveria bassiana</em> TS11 on <em>T. vaporariorum</em> adults. ZnO NPs were synthesized by precipitation method. Field emission scanning electron microscope images indicated that ZnO NPs were non-compacted uniformly. X-ray diffraction results confirmed the hexagonal wurtzite structure of ZnO NPs. Fourier transform infrared analysis showed an intense absorption peak at a range of 434-555 cm<sup>-1</sup> related to Zn-O bond. In bioassays, adults were exposed to different concentrations of ZnO NPs (3, 5, 10, 15, 20 mg l<sup>-1</sup>) and fungi (10<sup>4</sup>, 10<sup>5</sup>, 10<sup>6</sup>, 10<sup>7</sup>, 10<sup>8</sup> spores ml<sup>-1</sup>). LC<sub>50</sub> values for ZnO NPs and fungi were 7.35 mg l<sup>-1</sup>and 3.28×10<sup>5</sup> spores ml<sup>-1</sup>, respectively. Mortality rates obtained with ZnO NPs and fungi at the highest concentration were 91.6 % and 88.8 %, respectively. The results indicate a positive effect of ZnO NPs and <em>B. bassiana </em>TS11on adults. The current study was conducted under laboratory conditions, therefore, more studies are needed in field.</p>

Structural and Dielectric Properties of Zn1-xMoxO Nanoparticles

2020 ◽  
Vol 13 (2) ◽  
pp. 165-170
Keyword(s):  
Zinc Oxide ◽  
Dielectric Properties ◽  
Ac Conductivity ◽  
Hexagonal Wurtzite Structure ◽  
Dielectric Constants ◽  
Precipitation Method ◽  
Dielectric Parameters ◽  
Mo Doping ◽  
Lcr Meter ◽  
Co Precipitation

Abstract: In this work, samples of zinc oxide nanoparticles doped by molybdenum (Zn1-xMoxO with 0 ≤ x ≤ 0.1) were prepared by using the wet co-precipitation method. The characterization of the prepared samples was carried out by means of X-ray powder diffraction (XRD). The samples reserved their hexagonal wurtzite structure with Mo doping and showed a decrease in the crystallite size up to x = 0.04 followed by a further increase. On the other hand, dielectric measurements were performed using an LCR meter. The effect of frequency and temperature on the dielectric properties such as the real and imaginary parts of dielectric constant (ε^' and ε'', respectively), dielectric loss (tanδ) and ac-conductivity (σ_ac) of Mo-doped zinc oxide samples, was studied in the frequency range (100 Hz - 1 MHz) and at temperatures (300 - 773 K). The values of room temperature dielectric parameters were found to be strongly dependent on the Mo-doping. However, the increase in temperature caused an enhancement in the values of the dielectric parameters, particularly at 773 K. Keywords: Zinc oxide, XRD, Dielectric constants, Ac-conductivity.

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