scholarly journals Green Synthesis of Silver Nanoparticles using Delonix regia Extract, Characterization and its Application as Adsorbent for Removal of Cu (II) Ions from Aqueous Solution

2021 ◽  
pp. 1-15
Author(s):  
Ahmed M. Abu-Dief ◽  
Laila H. Abdel-Rahman ◽  
M. A. Abd– ElSayed ◽  
Mallak Megalea Zikry
Keyword(s):  
Particle Size ◽  
Silver Nanoparticles ◽  
Removal Efficiency ◽  
Chemical Constituents ◽  
Average Particle Size ◽  
Ion Concentration ◽  
Aqueous Environment ◽  
Average Particle ◽  
Particle Size Range ◽  
Delonix Regia

In this research synthesis of silver nanoparticles by a green method is studied. The high importance of silver nanoparticles using extract of Delonix regia (DREAgNs) is due to their unique properties, such as non-expensive, easily available and have application in water treatment. Synthesized silver nanoparticles AgNPs were characterized using UV-Visible Spectrophotometer to indicate the synthesis of AgNPs by green methods. The maximum absorbance of UV-Vis. analysis at wavelength 464 nm. (FT-IR) spectra to indicate the functional groups of phytochemical compounds at Delonix regia extract (DRE) and the silver nanoparticles (DREAgNPs) and also shows the role of active chemical constituents in stabilization and reduction of (DREAgNPs). Based on the transmission electron microscopy image analyses (TEM) confirmed the formation of spherical DREAgNPs with a particle size range of 20-50 nm with an average particle size of 35 nm. The Cu2+ ion adsorption process was studied by (DREAgNPs). The Cu2+ ions removal efficiency (R. E.) is 88.4 %   at an initial concentration 15 ppm. Removal efficiency (R. E.) decreases as the Cu2+ ion concentration increases.  Furthermore, thermodynamic studies confirmed that the biosorption process was endothermic and the positive value of ΔG° is quite common when an ion-exchange mechanism applies in the biosorption. The Positive value of ΔS◦ suggested an increase in randomness during the biosorption. The Freundlich isotherm has a good fit with the experimental data (R2 =0.99) compared to Langmuir isotherm (R2 = 0.90). This study shows that DREAgNPs are available, low cost, effective and environment friendlly biosorbent for the removal of Cu2+ ions from aqueous environment.

scholarly journals Sintesis Nanopartikel Perak Menggunakan Ekstrak Daun Kluwak Pangium edule Reinw Sebagai Bioreduktor dan Uji Aktivitasnya Sebagai Antioksidan

2019 ◽  
Vol 10 (1) ◽  
Author(s):  
Indrawati Patabang ◽  
Syahruddin Kasim ◽  
Paulina Taba
Keyword(s):  
Antioxidant Activity ◽  
Particle Size ◽  
Silver Nanoparticles ◽  
Leaf Extract ◽  
Average Particle Size ◽  
Xrd Analysis ◽  
Average Particle ◽  
Result Show ◽  
Ic50 Values ◽  
Show Result

Silver nanoparticles have been synthesized using kluwak leaf extract (Pangium edule Reinw) as bioreductor and antioxidant activity assay. The nanoparticles formed were monitored by observing UV-Vis absorption and characterized by using FTIR, PSA, XRD and SEM instruments. The result of functional group characterization with FTIR show that the functional groups OH, C = O, C-O and CH2 act as Ag+ reducing agent. The size of silver nanoparticles was determined by using Particle Size Analyzer (PSA) and the result show average particle size distribution of 93.2 nm. Morphology of AgNp were observed by Scanning Electron Microscope (SEM) and X-Ray Difraction (XRD) analysis show result of 51,78 nm. The antioxidant activity was shown by in kluwak leaf extract and silver nanoparticles with IC50 values respectively 831,33 ppm dan 1493,09 ppm.

scholarly journals Laser Ablated Silver Nanoparticles with Nearly the Same Size in Different Carrier Media

2010 ◽  
Vol 2010 ◽  
pp. 1-7 ◽  
Author(s):  
Antonio M. Brito-Silva ◽  
Luiz A. Gómez ◽  
Cid B. de Araújo ◽  
André Galembeck
Keyword(s):  
Particle Size ◽  
Silver Nanoparticles ◽  
Chemical Reduction ◽  
Average Particle Size ◽  
Good Control ◽  
Silver Ions ◽  
Vinyl Pyrrolidone ◽  
Poly Vinyl Alcohol ◽  
Average Particle ◽  
Resonance Band

Poly(vinyl-pyrrolidone) (PVP) stabilized silver nanoparticles with an average particle size ranging from 4.3 to 4.9 nm were synthesized by laser ablation in preformed colloids in methanol, acetone, ethylene glycol, and glycerin. Aqueous colloids obtained using PVP, poly(vinyl-alcohol) (PVA), and sodium citrate as stabilizing agents also lead to a good control over particle size distribution. Silver ions were reduced with sodium borohydride. The smaller average particle size and narrower dispersivity in comparison to previously reported data were ascribed to the relatively small size of the particles formed in the chemical reduction step, laser fluence, and the use of PVP, which was not previously used as the stabilizing agent in “top-down” routes. The surface plasmon resonance band maximum wavelength shifted from 398 nm in methanol to 425 nm in glycerin. This shift must be due to solvent effects since all other variables were the same.

The Aggregation Study and Characterization of Silver Nanoparticles

2017 ◽  
Vol 263 ◽  
pp. 165-169
Author(s):  
Silvia Chowdhury ◽  
Faridah Yusof ◽  
Nadzril Sulaiman ◽  
Mohammad Omer Faruck
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Particle Size ◽  
Silver Nanoparticles ◽  
Absorption Spectrum ◽  
Average Particle Size ◽  
Average Particle ◽  
Transmission Electron ◽  
Vis Spectroscopy

In this article, we have studied the process of silver nanoparticles (AgNPs) aggregation and to stop aggregation 0.3% Polyvinylpyrrolidone (PVP) was used. Aggregation study carried out via UV-vis spectroscopy and it is reported that the absorption spectrum of spherical silver nanoparticles were found a maximum peak at 420 nm wavelength. Furthermore, Transmission Electron Microscopy (TEM) were used to characterized the size and shape of AgNPs, where the average particle size is around 10 to 25 nm in diameter and the AgNPs shape is spherical. Next, Dynamic Light Scattering (DLS) were used, owing to observed size distribution and self-correlation of AgNPs.

scholarly journals Green synthesis, characterization, and antimicrobial activity of silver nanoparticles prepared using Trigonella foenum-graecum L. leaves grown in Saudi Arabia

2021 ◽  
Vol 10 (1) ◽  
pp. 421-429
Author(s):  
Humaira Rizwana ◽  
Mona S. Alwhibi ◽  
Hadeel A. Aldarsone ◽  
Manal Ahmed Awad ◽  
Dina A. Soliman ◽  
...  
Keyword(s):  
Particle Size ◽  
Silver Nanoparticles ◽  
Saudi Arabia ◽  
Green Synthesis ◽  
Antimicrobial Agents ◽  
Average Particle Size ◽  
Antimicrobial Activities ◽  
Average Particle ◽  
Pathogenic Yeast ◽  
Trigonella Foenum Graecum L

Abstract Silver nanoparticles (AgNPs) are widely used for medical applications particularly as antimicrobial agents against multidrug-resistant microbial strains. Some plants stimulate the reduction of Ag ions to AgNPs. In this study, we prepared AgNPs via the green synthesis approach using fenugreek leaves grown in Saudi Arabia. Furthermore, we characterized these AgNPs and evaluated their antimicrobial activities against pathogenic yeast, bacteria, and fungi. The ultraviolet-visible peak at 380 nm confirmed the biosynthesis of NPs. Transmission electron microscopy analyses revealed particle size in the range of 9–57 nm with a spherical shape. Dynamic light scattering results confirm slight aggregation as the average particle size was shown as 68.71 nm and a polydispersity index of 0.083. The energy-dispersive X-ray spectroscopy results showed an intense peak at 3 keV, indicating the presence of elemental AgNPs. The synthesized AgNPs efficiently inhibit the growth of both Gram-positive and Gram-negative bacteria; however, varying degree of inhibition was shown toward fungi. The potent antimicrobial ability of the synthesized NPs can be attributed to their small size and round shape. Among all test organisms, the growth of Candida albicans and Helminthosporium sativum was remarkably affected by AgNPs treatment.

Formulation and Evaluation of Ketoprofen Using β-Cyclodextrin Capped Silver Nanoparticles

2021 ◽  
Vol 14 (3) ◽  
pp. 5501-5507
Author(s):  
Kiranmai Mandava ◽  
Kruthika Lalit ◽  
Venu Madhav Katla
Keyword(s):  
Particle Size ◽  
Silver Nanoparticles ◽  
Average Particle Size ◽  
Amorphous State ◽  
Entrapment Efficiency ◽  
In Vitro Dissolution ◽  
Average Particle ◽  
Dissolution Studies ◽  
Drug Entrapment Efficiency

The objective of the study was to develop silver nanoparticles loaded with Ketoprofen (Ag-KP) for increasing the drug solubility and thereby its bioavailability. Ag-KP were prepared by the solvent evaporation method using β-Cyclodextrin as a biodegradable polymer. Different formulations of Ag-KP were characterized for the drug entrapment efficiency, Fourier Transform Infrared Spectroscopy (FTIR), particle size analysis, X-ray diffraction studies (XRD), scanning electron microscopy (SEM) and  in-vitro dissolution studies. The optimized formulation (F6) has shown an average particle size of 167.8 ± 3.46 nm,zeta potential of -23.7 ± 1.46 mV. FTIR revealed that the drug showed good excipient compatibility. XRD studies showed that the drug has changed from crystalline to amorphous state. In all formulations, F6 formulation (optimized) exhibited high drug entrapment efficiency (∼93%). SEM studies indicated the shape of Ag-KP was roughly spherical with smooth surface. In vitro dissolution studies showed that Ag-KP from F6 formulation was 94.3 ± 4.9% but for the marketed formulation, it is only 84.6 ± 3.7% in 12 hours and F6 was found to be found stable for three months at both refrigerated and room temperature (RT).

Synthesis and Characterization of Peptidomimetic Self-Assembled Biodegradable Nanoparticles

2009 ◽  
Vol 1238 ◽  
Author(s):  
Àngel E. Mercado-Pagán ◽  
Esmaiel Jabbari
Keyword(s):  
Particle Size ◽  
Degradation Kinetics ◽  
Average Particle Size ◽  
Active Agent ◽  
Polymer Chains ◽  
Peptide Sequence ◽  
Aqueous Environment ◽  
Average Particle ◽  
Self Assembling ◽  
The Matrix

AbstractNanoparticles (NPs) are being used extensively for tumor drug delivery. These devices offer the advantage of their size, protection of the encapsulated species, and biodegradability to prevent accumulation in the interstitium. Our laboratory has synthesized polylactide fumarate (PLAF, PLGF) macromers capable of self-assembling into biodegradable and biocompatible NPs with average particle size of 280 nm. To assess the possibility of further decreasing the particle size and distribution of PLGF NPs, the polymers were conjugated with the peptide sequence Cys-Val-Val-Val-Val-Val-Val-Lys-Lys (CV6K2), which is known to self-assemble in aqueous solution into vesicles of about 50-60 nm in size. The results indicate that the PLGF-CV6K2 conjugates are capable of self-assembling into NPs of 100 nm in diameter. The NPs are proposed as having a bilayer structure, with peptide chains facing the aqueous environment and the polymer chains compacted in an internal hydrophobic layer. Degradation kinetics and release profiles show that the NPs could effectively retain and release Paclitaxel up to 30 days until completely degraded. The NPs act as reservoirs for sustained release of the active agent by diffusion and degradation of the matrix when taken up by tumor cells.

Synchrotron X-Ray Scattering for the Structural Characterization of Catalysts

1986 ◽  
Vol 30 ◽  
pp. 389-394
Author(s):  
R. J. De Angelis ◽  
A. G. Dhere ◽  
M. A. Maginnis ◽  
P. J. Reucroft ◽  
G. E. Ice ◽  
...  
Keyword(s):  
Particle Size ◽  
Particle Size Distribution ◽  
Size Distribution ◽  
Profile Analysis ◽  
Average Particle Size ◽  
Initial Slope ◽  
Average Particle ◽  
Particle Size Range ◽  
Diffraction Profile ◽  
X Ray

Discussions exist in the literature concerning the application of single x-ray diffraction profile analysis to determine the average particle size, particle size distribution and root mean squared strain in catalytic systems. Nandi et al. have shown that the single order analysis can give erroneous strain results and is subject to error in the large particle size range. They further indicated that the initial slope of Stokes corrected Fourier coefficients gives more reliable average p article size than that which is calculated from single order peak shape analysis. There is apparent agreement that the average particle size and the particle size distribution measured by single order profile analysis, in small metal particle systems, are reliable.

Correlation Between Quantum Nanocrystal Particle Size and Photoluminescence Using Raman Scattering

1994 ◽  
Vol 358 ◽  
Author(s):  
E. W. Forsvthe ◽  
E. A. Whittaker ◽  
F.H. Pollak ◽  
B. S. Sywe ◽  
G. S. Tompa ◽  
...  
Keyword(s):  
Particle Size ◽  
Porous Silicon ◽  
Raman Scattering ◽  
Average Particle Size ◽  
Visible Spectral Range ◽  
Luminescence Spectra ◽  
Average Particle ◽  
Particle Size Range ◽  
Quantum Size ◽  
Transmission Electron

ABSTRACTThe PL (photoluminescence) and EL (electroluminescence) demonstrated for porous silicon and silicon rich SiO2 films have provided exciting opportunities for the integration of optoelectronics and Si digital electronics. Recent work has suggested that the porous silicon luminescence results from either quantum size or surface state effects. In this report, we review PL demonstrated in the visible spectral range from quantum nanocrystals (QNC) formed from Si embedded in an SiO2 matrix. We used Raman scattering to estimate the QNC particle size and correlated the shift in the luminescence spectra to the observed change in the Raman spectra. The PL spectrum peak shifted from 7000 to 8000 Å as the average particle size increased from ∼50 to 70 Å, measured from Raman scattering. Further, High Resolution Transmission Electron Microscopy, HRTEM, and X-ray Diffraction, XRD, measurements confirmed the particle size range. PL lifetime measurements and excitation intensity studies are also presented. The stable nature of the QNC embedded in an insulating or semiconducting matrix offers further advances towards the integration of optoelectronics with Si devices.

Biosynthesis of silver nanoparticles by usingGanoderma-mushroom extract

2015 ◽  
Vol 29 (06n07) ◽  
pp. 1540047 ◽  
Author(s):  
S. U. Ekar ◽  
Y. B. Khollam ◽  
P. M. Koinkar ◽  
S. A. Mirji ◽  
R. S. Mane ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Particle Size ◽  
Silver Nanoparticles ◽  
Average Particle Size ◽  
Average Particle ◽  
Medicinal Mushroom ◽  
Ag Nps ◽  
Transmission Electron ◽  
Uv Visible

Present study reports the biochemical synthesis of silver nanoparticles ( Ag -NPs) from aqueous medium by using the extract of medicinal mushroom Ganoderma, as a reducing and stabilizing agents. The Ag -NPs are prepared at room temperature by the reduction of Ag+to Ag in aqueous solution of AgNO3. The resultant particles are characterized by using UV-visible spectroscopy, Fourier transform infrared (FTIR) spectroscopy and transmission electron microscopy (TEM) measurement techniques. The formation of Ag -NPs is confirmed by recording the UV-visible absorption spectra for surface plasmon resonance (SPR) where peak around 427 nm. The prominent changes observed in FTIR spectra supported the reduction of Ag+to Ag . The morphological features of Ag -NPs are evaluated from HRTEM. The spherical Ag -NPs are observed in transmission electron microscopy (TEM) studies. The particle size distribution is found to be nearly uniform with average particle size of 2 nm. The Ag -NPs aged for 15, 30, 60 and 120 days showed no profound effect on the position of SPR peak in UV-visible studies, indicating the protecting/capping ability of medicinal mushroom Ganoderma in the synthesis of Ag -NPs.

scholarly journals Sargassum Influx on the Mexican Coast: A Source for Synthesizing Silver Nanoparticles with Catalytic and Antibacterial Properties

2021 ◽  
Vol 11 (10) ◽  
pp. 4638
Author(s):  
Jose Luis López-Miranda ◽  
Rodrigo Esparza ◽  
Marlen Alexis González-Reyna ◽  
Beatriz Liliana España-Sánchez ◽  
Angel Ramon Hernandez-Martinez ◽  
...  
Keyword(s):  
Particle Size ◽  
Silver Nanoparticles ◽  
Average Particle Size ◽  
Antibacterial Properties ◽  
Average Particle ◽  
X Ray Diffraction ◽  
X Ray ◽  
Experimental Parameters ◽  
First Time

This work reports, for the first time, the synthesis of silver nanoparticles using extracts of the species of Sargassum natans and Sargassum fluitans (AgNPs-S). Their antibacterial and catalytic properties are compared with silver nanoparticles obtained by chemical synthesis (AgNPs-C). The characterization of AgNPs-S and AgNPs-C was carried out using ultraviolet–visible spectroscopy (UV–Vis), dynamic light scattering (DLS), zeta potential, a scanning electron microscope (SEM), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), and thermogravimetric analysis. The synthesis of silver nanoparticles using Sargassum extract was optimized through varying experimental parameters, such as the type of solvent used to prepare the extract, the volume of the extract, and the pH of the system. The most efficient sample (AgNPs-S) was prepared with a water–ethanol-based extract, using a 3:1 volumetric ratio of extract: a precursor salt with the addition of 1 mL of NaOH pH = 14. The AgNPs-C were spherical in shape, with an average particle size of 11.55 nm, while the AgNPs-S were polyhedral shaped, with an average particle size of 26.39 nm. The synthesized AgNPs-S were found to have significantly higher catalytic activity for the degradation of methylene blue and more effective antibacterial activity against Staphylococcus aureus and Pseudomonas aeruginosa than AgNPs-C.

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