Synthesis and characterization of nano sized cobalt oxide by precipitation method

2020 ◽  
Vol 3 (3) ◽  
Author(s):  
Pavithra D ◽  
Sujatha K ◽  
Sudha A P
Keyword(s):  
Cobalt Oxide ◽  
Ammonium Oxalate ◽  
Cobalt Nitrate ◽  
Morphological Properties ◽  
Precipitation Method ◽  
Oxide Nanoparticles ◽  
Average Crystalline Size ◽  
Co3o4 Nanoparticles ◽  
X Ray ◽  
Cobalt Oxide Nanoparticles

In the present work, cobalt oxide nanoparticles were prepared by using precipitation method. The cobalt nitrate [Co (No3)2] and ammonium oxalate [C2H8N2O4] were used as precursors for the synthesis of cobalt oxide nanoparticles and the resultant product was Calcinated at 400˚C for 2 hrs. The synthesized nanoparticles were characterized by X-ray diffraction (XRD), Fourier Transform Infrared Spectroscopy (FTIR), Scanning Electron Microscope (SEM), Energy Dispersive X-ray Spectroscopy (EDAX) to analyze the structural and morphological properties. The XRD pattern of the synthesized cobalt oxide nanoparticles exhibits cubic structure with the average crystalline size of 8.06 nm. The functional groups of the synthesized nanoparticles were confirmed by using FTIR spectrum (400 to 4000 cm-1). In the synthesized sample and its purity were confirmed from EDAX spectrum. The surface morphology of the synthesized Co3O4 nanoparticles shows spherical morphology. The optical properties of the synthesized cobalt oxide nanoparticles were investigated by photoluminescence spectrum which shows a minor emission at around 440 nm.

Appraisal of innovative phytosynthetic CdO NPs from leaf extract of Ocimum Sanctum and their bactericidal activity against different strains

2020 ◽  
Vol 3 (2) ◽  
Author(s):  
Aarth R ◽  
Sudha A P ◽  
Sujatha B ◽  
Sowmya Lakshmi K
Keyword(s):  
Leaf Extract ◽  
Cadmium Oxide ◽  
Morphological Properties ◽  
Precipitation Method ◽  
Ocimum Sanctum ◽  
Oxide Nanoparticles ◽  
Average Crystalline Size ◽  
Face Centered Cubic ◽  
Bacterial Strains ◽  
X Ray

The phytosynthesis of n-type Cadmium Oxide Nanoparticles reduces the toxicity of the substance and makes it Eco-friendly. This Eco-friendly biosynthesis of CdO NPs was synthesized for the first time from the Queen of herbs, Ocimum Sanctum (holy basil).The biosynthesized Cadmium oxide was prepared using Ocimum leaf extract as a reductant and Cadmium Chloride and hydroxide as cadmium and oxide source materials by Co- Precipitation method. Thus obtained Cadmium Oxide Nanoparticles were characterized by different techniques such as X-ray diffraction (XRD), Fourier Transform infrared spectroscopy (FTIR), Scanning electron microscope (SEM),Energy dispersive X-ray spectroscopy(EDS) to study the structural and morphological properties. XRD pattern exhibited the formation of face centered cubic structure of CdO NPs with an average crystalline size of 11.5nm .The chemical bond formation of CdO NPs were confirmed by FTIR spectrum in the range of (400-4000cm-1). The SEM micrographs revealed the predominant formation of Cauliflower shape with a particle size in the range of 61-142nm. The high purity of the biosynthesized nanoparticles were confirmed by EDS analysis. Further it was tested against gram positive and gram negative bacterial strains and showed significant antibacterial activity. This biosynthetic research study opens an innovative window to progress our understanding of how CdO NPs shows resistance to different bacterial strains.

Synthesis of some Novel Imidazoles Catalyzed by Co3O4 Nanoparticles and Evaluation of their Antibacterial Activities

2018 ◽  
Vol 21 (4) ◽  
pp. 271-280 ◽  
Author(s):  
Mohammad A. Ghasemzadeh ◽  
Mohammad H. Abdollahi-Basir ◽  
Zahra Elyasi
Keyword(s):  
Cobalt Oxide ◽  
Ammonium Acetate ◽  
Reaction Times ◽  
Antibacterial Activities ◽  
Primary Amines ◽  
Oxide Nanoparticles ◽  
Co3o4 Nanoparticles ◽  
Cobalt Oxide Nanoparticles ◽  
Ft Ir ◽  
Tetrasubstituted Imidazoles

Aim and Objective: The multi-component condensation of benzil, primary amines, ammonium acetate and various aldehydes was efficiently catalyzed using cobalt oxide nanoparticles under ultrasonic irradiation. This approach describes an effective and facile method for the synthesis of some novel 1,2,4,5-tetrasubstituted imidazole derivatives with several advantages such as high yields and short reaction times and reusability of the catalyst. Moreover, the prepared heterocyclic compounds showed high antibacterial activity against some pathogenic strains. Materials and Method: The facile and efficient approaches for the preparation of Co3O4 nanoparticles were carried out by one step method. The synthesized heterogeneous nanocatalyst was characterized by spectroscopic analysis including EDX, FE-SEM, VSM, XRD and FT-IR analysis. The as-synthesized cobalt oxide nanoparticles showed paramagnetic behaviour in magnetic field. In addition, the catalytic influence of the nanocatalyst was examined in the one-pot reaction of primary amines, benzil, ammonium acetate and diverse aromatic aldehydes under ultrasonic irradiation. All of the 1,2,4,5-tetrasubstituted imidazoles were investigated and checked with m.p., 1H NMR, 13C NMR and FT-IR spectroscopy techniques. The antibacterial properties of the heterocycles were evaluated in vitro by the disk diffusion against pathogenic strains such as Escherichia coli (EC), Bacillus subtillis (BS), Staphylococcus aureus (SA), Salmonellatyphi (ST) and Shigella dysentrae (SD) species. Results: In this research cobalt oxide nanostructure was used as a robust and green catalyst in the some novel imidazoles. The average particle size measured from the FE-SEM image is found to be 20-30 nm which confirmed to the obtained results from XRD pattern. Various electron-donating and electron-withdrawing aryl aldehydes were efficiently reacted in the presence of Co3O4 nanoparticles. The role of the catalyst as a Lewis acid is promoting the reactions with the increase in the electrophilicity of the carbonyl and double band groups. To investigate the reusability of the catalyst, the model study was repeated using recovered cobalt oxide nanoparticles. The results showed that the nanocatalyst could be reused for five times with a minimal loss of its activity. Conclusion: We have developed an efficient and environmentally friendly method for the synthesis of some tetrasubstituted imidazoles via three-component reaction of benzil, primary amines, ammonium acetate and various aldehydes using Co3O4 NPs. The present approach suggests different benefits such as: excellent yields, short reaction times, simple workup procedure and recyclability of the magnetic nanocatalyst. The prepared 1,2,4,5-tetrasubstituted imidazoles revealed high antibacterial activities and can be useful in many biomedical applications.

scholarly journals Synthesis, Characterization, and Antimicrobial Activity of CoO Nanoparticles from a Co (II) Complex Derived from Polyvinyl Alcohol and Aminobenzoic Acid Derivative

2021 ◽  
Vol 2021 ◽  
pp. 1-11
Author(s):  
Maged S. Al-Fakeh ◽  
Roaa O. Alsaedi
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Cobalt Oxide ◽  
Oxide Nanoparticles ◽  
Aminobenzoic Acid ◽  
X Ray Diffraction ◽  
X Ray ◽  
Cobalt Oxide Nanoparticles ◽  
Coo Nanoparticles ◽  
Scanning Electron

Cobalt oxide nanoparticles (CoO NPs) were synthesized by the calcination method from the Co (II) complex which has the formula [Co(PVA)(P-ABA)(H2O)3], PVA = polyvinyl alcohol, and P-ABA = para-aminobenzoic acid. The calcination temperature was 550°C, and the products were characterized by element analysis, thermal analyses (TGA and DTA), Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), UV-Vis spectra, and scanning electron microscopy (SEM) techniques. The kinetic and thermodynamic parameters (∆H   ∗ , ∆G   ∗ , and ∆S   ∗ ) for the cobalt (II) complex are calculated. The charges been carried by the atoms cause dipole moment 10.53 and 3.84 debye and total energy 11.04 × 102 and 24.80 × 102k Cal mol−1 for the Co (II) complex and cobalt oxide, respectively. X-ray diffraction confirmed that the resulting oxide was pure single-crystalline CoO nanoparticles. Scanning electron microscopy indicating that the crystallite size of cobalt oxide nanocrystals was in the range of 36–54 nm. Finally, the antimicrobial activity of cobalt oxide nanoparticles was evaluated using four bacterial strains and one fungal strain. Two strains of Gram-positive cocci (Staphylococcus aureus and Enterococcus faecalis), two strains of Gram-negative bacilli (Escherichia coli and Pseudomonas aeruginosa), and one strain of yeast such as fungi (Candida albicans) were used in this study.

scholarly journals Multiwalled Carbon Nanotubes Decorated with Cobalt Oxide Nanoparticles

2012 ◽  
Vol 2012 ◽  
pp. 1-5 ◽  
Author(s):  
D. G. Larrude ◽  
P. Ayala ◽  
M. E. H. Maia da Costa ◽  
F. L. Freire
Keyword(s):  
Carbon Nanotubes ◽  
Cobalt Oxide ◽  
Multiwalled Carbon Nanotubes ◽  
Cobalt Nitrate ◽  
Oxide Nanoparticles ◽  
Nitrate Hexahydrate ◽  
Multiwalled Carbon ◽  
Cobalt Oxide Nanoparticles ◽  
Electron Microscopy Analysis ◽  
Average Size

Multiwalled carbon nanotubes (MWCNTs) synthesized by spray pyrolysis were decorated with cobalt oxide nanoparticles using a simple synthesis route. This wet chemistry method yielded nanoparticles randomly anchored to the surface of the nanotubes by decomposition of cobalt nitrate hexahydrate diluted in acetone. Electron microscopy analysis indicated that dispersed particles were formed on the MWCNTs walls. The average size increased with the increasing concentration of cobalt nitrate in acetone in the precursor mixture. TEM images indicated that nanoparticles were strongly attached to the tube walls. The Raman spectroscopy results suggested that the MWCNT structure was slightly damaged after the nanoparticle growth.

Precipitation method and characterization of cobalt oxide nanoparticles

2017 ◽  
Vol 123 (4) ◽  
Author(s):  
D. Durai Manoharadoss Prabaharan ◽  
K. Sadaiyandi ◽  
M. Mahendran ◽  
Suresh Sagadevan
Keyword(s):  
Cobalt Oxide ◽  
Precipitation Method ◽  
Oxide Nanoparticles ◽  
Cobalt Oxide Nanoparticles

scholarly journals Microbial and Plant Assisted Synthesis of Cobalt Oxide Nanoparticles and Their Antimicrobial Activities

Agronomy ◽  
2021 ◽  
Vol 11 (8) ◽  
pp. 1607
Author(s):  
Nadia Mubraiz ◽  
Asghari Bano ◽  
Tariq Mahmood ◽  
Naeem Khan
Keyword(s):  
Particle Size ◽  
Bacillus Subtilis ◽  
Fusarium Oxysporum ◽  
Cobalt Oxide ◽  
Bacterial Strain ◽  
Oxide Nanoparticles ◽  
Average Particle ◽  
Co3o4 Nanoparticles ◽  
Cobalt Oxide Nanoparticles ◽  
Wide Range

The development of sustainable, ecofriendly, and cost-effective methods for the synthesis of nanomaterials is an important aspect of nanotechnology these days. The present study was aimed at synthesizing cobalt oxide (Co3O4) nanoparticles by using plant extracts of Aerva javanica, bacterial isolates from rhizospheric soil of Potentilla atrosanguinea, Swertia petiolata, Senecio chrysanthemoides, and from fungus Fusarium oxysporum. X-ray diffraction spectroscopy (XRD) and scanning electron microscopy (SEM) techniques were used in the characterization of the synthesized nanoparticles. The bacterial strain, Bacillus subtilis, isolated from rhizosphere of Potentilla atrosanguinea (N1C1), Fusarium oxysporum, methanolic and aqueous extracts of Aerva javanica reduced the cobalt salts to cobalt oxide nanoparticles. The nanoparticles, synthesized from bacterial isolate N1C1 (Bacillus subtilis) and from Fusarium oxysporum had average particle size of 31.2 nm and 33.4 nm, respectively, whereas, the particle size of Aerva javanica was higher (39.2 nm) and all the nanoparticles were poly shaped. The nanoparticles synthesized from methanolic extract of Aerva javanica, bacterial strain (N1C1) and fungi Fusarium oxysporum showed better performance against Bacillus subtilis and P. aeruginosa, the bactericidal activity was higher against Gram-positive bacterial strains. Methanolic extracts of leaf and flower have shown a wide range of phytochemicals and higher antibacterial activity, and among all strains, Pseudomonas aeruginosa and Bacillus subtilis susceptibility was greater to extracts.

scholarly journals Synthesis and Structural, Optical Properties of Cadmium Doped Cobalt Oxide Nanoparticles

2021 ◽  
pp. 32-37
Author(s):  
Mayakannan M ◽  
Vinoth E ◽  
Prabakar S
Keyword(s):  
Fourier Transform ◽  
Infrared Spectroscopy ◽  
Fourier Transform Infrared Spectroscopy ◽  
Cobalt Oxide ◽  
Fourier Transform Infrared ◽  
Oxide Nanoparticles ◽  
X Ray Diffraction ◽  
X Ray ◽  
Cobalt Oxide Nanoparticles ◽  
Vis Spectroscopy

The nanostructure cadmium doped cobalt oxide nanoparticles were prepared by microwave irradiation techniques. The prepared nanoparticles were further characterized using Powder X-ray diffraction, Fourier transform infrared spectroscopy and UV-Vis spectroscopy. The Powder X ray diffraction results shows good crystalline nature. The Fourier transform infrared spectroscopy conforms stretching and bending vibration of metal oxygen groups. UV-Vis spectroscopy results show absorption edges are 204 nm, 220nm prepared nanoparticles additionally optical parameter skin depth, extinction co-efficient, reflectance, refractive index is calculated.

scholarly journals Oxidative Treatment of Rhodamine B Solution on CoOx/sepiolite Catalysts

2020 ◽  
pp. 37-46
Author(s):  
Thao Nguyen Tien ◽  
Dang Van Long ◽  
Nguyen Bich Ngoc ◽  
Nguyen Thi Nhu
Keyword(s):  
Hydrogen Peroxide ◽  
Cobalt Oxide ◽  
Rhodamine B ◽  
Room Temperature ◽  
Specific Area ◽  
Precipitation Method ◽  
Oxide Nanoparticles ◽  
Physical Methods ◽  
Cobalt Oxide Nanoparticles ◽  
Oxidative Treatment

Sepiolite loaded with different cobalt oxide contents has been prepared by the precipitation method followed by calcination at 410ºC. The synthesized Co-loaded samples were characterized by physical methods using XRD, SEM, BET, and H2-TPR. The obtained solids have a large specific area and good distribution of cobalt oxide nanoparticles on sepiolite carrier. The catalysts were tested for the oxidative removal of rhodamine B solution and found that 1.0 – 3.0 wt.% cobalt ion/sepiolite samples exhibited the highest decoloration efficiency of rhodamine B (88-90%) in the presence of hydrogen peroxide at room temperature after the treatment of 30 mg/L of RhB solution in 210 minutes.

scholarly journals Hydrothermal synthesis and characterization under dynamic conditions of cobalt oxide nanoparticles supported over magnesium oxide nano-plates

2016 ◽  
Vol 45 (24) ◽  
pp. 9932-9941 ◽  
Author(s):  
Selim Alayoglu ◽  
Daniel J. Rosenberg ◽  
Musahid Ahmed
Keyword(s):  
Hydrothermal Synthesis ◽  
Cobalt Oxide ◽  
Magnesium Oxide ◽  
Synthesis And Characterization ◽  
Oxide Nanoparticles ◽  
Surface Evolution ◽  
Dynamic Conditions ◽  
X Ray ◽  
Cobalt Oxide Nanoparticles ◽  
Nano Catalyst

Surface evolution of a nano-catalyst comprised of oxidized Co NPs and MgO nano-plates was studied under O2, H2 and H2 + CO atmospheres using synchrotron-based X-ray spectroscopies.

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