scholarly journals Silver Nanoparticles: Green Synthesis, Characterization, and Their Usage in Determination of Mercury Contamination in Seafoods

2014 ◽  
Vol 2014 ◽  
pp. 1-5 ◽  
Author(s):  
Muhammad Ahad Ahmed ◽  
Najmul Hasan ◽  
Shaikh Mohiuddin
Keyword(s):  
Silver Nanoparticles ◽  
Aqueous Solutions ◽  
Ag Nanoparticles ◽  
Colorimetric Method ◽  
Mercury Contamination ◽  
Selective Detection ◽  
Vis Spectroscopy ◽  
Mercuric Ions ◽  
Proportional Relationship

We demonstrate that silver nanoparticles undergo an interaction with Hg2+ found in traces. The PEG-PVP-stabilized Ag nanoparticles were successfully synthesized via a reduction approach and characterized with surface plasmon resonance UV/Vis spectroscopy. By utilizing the redox reaction between Ag nanoparticles and Hg2+, and the resulted decrease in UV/Vis signal, we develop a colorimetric method for detection of Hg2+ ion. A linear and inversely proportional relationship was found between the absorbance intensity of the Ag nanoparticles and the concentration of Hg2+ ion over the range from 10 ppm to 1 ppm at absorption on 411 nm. The detection limit for Hg2+ ions in homogeneous aqueous solutions is estimated to be 1 ppm. This system shows excellent selectivity for Hg2+. The results found have potential implications in the development of new colorimetric sensors for easy and selective detection and monitoring of mercuric ions in aqueous solutions. The proposed method was successfully applied to quantify the amount of mercury in seafood.

Facile Synthesis of Silver Nanoparticles by Chemical Reduction Route

2013 ◽  
Vol 756 ◽  
pp. 99-105
Author(s):  
Rajasingam Ratnamalar ◽  
Mustapha Mariatti ◽  
Zulkifli Ahmad ◽  
Sharif Zein Sharif Hussein
Keyword(s):  
Silver Nanoparticles ◽  
Ag Nanoparticles ◽  
Chemical Reduction ◽  
Facile Synthesis ◽  
Cubic Lattice ◽  
Vis Spectroscopy ◽  
Simple Chemical ◽  
The Face ◽  
Fine Control ◽  
Xrd Patterns

This work reports a simple chemical reduction route for the preparation of uniformed Ag nanoparticles whereby a fine control over the sizes of the Ag nanoparticles was studied by varying the concentrations of the reducing agents used. In characterization, UV-Vis spectroscopy showed the changes in optical properties of the Ag nanoparticles with regards to their sizes, where as the XRD patterns of the synthesized Ag nanoparticles confirmed the distinct peaks approximately at 2θ = 38.1°, 44.3°, 64.4°, 77.4°, and 81.5 representing Bragg’s reflections from (111), (200), (220), (311), and (222) planes of the face centred cubic lattice phase. This route of synthesis is feasible to produce Ag nanoparticles with diameters in the range of 30-45 nm.

scholarly journals Synthesis of silver nanoparticles from extracts of Scytonema geitleri HKAR-12 and their in vitro antibacterial and antitumor potentials

2019 ◽  
Vol 8 (3) ◽  
pp. 576-585
Keyword(s):  
Silver Nanoparticles ◽  
Coli Strain ◽  
X Ray Diffraction ◽  
Xrd Pattern ◽  
E Coli ◽  
Vis Spectroscopy ◽  
Shape Structure ◽  
Actual Size

In the present study silver nanoparticles (AgNPs) have been synthesized through the cell-free extracts of the rooftop dwelling cyanobacterium Scytonema geitleri HKAR-12. UV-VIS spectroscopy, FTIR, X-ray diffraction, SEM and TEM were used for the determination of morphological, structural and optical properties of synthesized AgNPs. Extracts of Scytonema geitleri HKAR-12 have the ability to reduce AgNO3 to Ag0. Sharp peak at 422 nm indicated the rapid synthesis of AgNPs. FTIR results showed the presence of different groups responsible for the reduction of AgNO3 to AgNPs. XRD pattern confirmed the crystalline nature of AgNPs. SEM showed the bead shape structure of AgNPs. TEM confirmed the actual size of AgNPs to be ranging between 9-17 nm. AgNPs showed antibacterial activity against Pseudomonas aeruginosa, Escherichia coli strain1 and E. coli strain 2 and 11 μg/mL of AgNPs effectively inhibited the growth of MCF-7 cells. Hence, Scytonema geitleri HKAR-12, isolated from the rooftop could serve as a desirable biological candidate for convenient and cheap production of AgNPs having antimicrobial and anti-cancerous properties.

scholarly journals Investigation on the Effect of Addition of Fe3+ Ion into the Colloidal AgNPs in PVA Solution and Understanding Its Reaction Mechanism

2017 ◽  
Vol 17 (3) ◽  
pp. 439 ◽  
Author(s):  
Roto Roto ◽  
Marcelina Marcelina ◽  
Nurul Hidayat Aprilita ◽  
Mudasir Mudasir ◽  
Taufik Abdillah Natsir ◽  
...  
Keyword(s):  
Silver Nanoparticles ◽  
Reaction Mechanism ◽  
Polyvinyl Alcohol ◽  
Aqueous Solutions ◽  
Surface Plasmon ◽  
Ag Nanoparticles ◽  
Capping Agents ◽  
Colorimetric Methods

Analysis of Fe3+ ion present in aqueous solutions is always of interests. Recently, this ion has been analyzed by colorimetric methods using colloid of silver nanoparticles (AgNPs) in capping agents of polymers. The reaction mechanism between AgNPs and Fe3+ is still subject to the further investigation. In this work, 1,10-phenanthroline was used to probe the reaction mechanism between AgNPs and Fe3+ ion in the solution. The colloids of AgNPs were prepared in the polyvinyl alcohol (PVA) solution and reacted with Fe3+. The colloid surface plasmon absorbance decreases linearly along with the increase in Fe3+ concentration. The addition of 1,10-phenanthroline to mixture changes the solution to red, indicating that the reaction produces Fe2+. This suggests that the reduction of the AgNPs absorbance is the result of oxidation of the Ag nanoparticles along with the reduction of Fe3+.

Refractive Index Tailoring of Poly(methylmethacrylate) Thin Films by Embedding Silver Nanoparticles

2012 ◽  
Vol 585 ◽  
pp. 134-138 ◽  
Author(s):  
Alisha Goyal ◽  
Jyoti Rozra ◽  
Isha Saini ◽  
Pawan K. Sharma ◽  
Annu Sharma
Keyword(s):  
Thin Films ◽  
Silver Nanoparticles ◽  
Refractive Index ◽  
Band Gap ◽  
Ag Nanoparticles ◽  
Nanocomposite Films ◽  
Ex Situ ◽  
Plasmon Resonance Peak ◽  
Pmma Matrix ◽  
Vis Spectroscopy

Nanocomposite films of Poly (methylmethacrylate) with different concentration of silver nanoparticles were prepared by ex-situ method. Firstly, silver nanoparticles were obtained by reducing the aqueous solution of silver nitrate with sodium borohydride then Ag-PMMA films were prepared by mixing colloidal solution of silver nanoparticles with solution of polymer. Thin solid films were structurally characterized using UV-VIS spectroscopy and TEM. The appearance of surface plasmon resonance peak, characteristic of silver nanoparticles at 420 nm in UV-VIS absorption spectra of Ag-PMMA films confirms the formation of Ag-PMMA nanocomposite. TEM showed Ag nanoparticles of average size 8 nm embedded in PMMA matrix. Analysis of absorption and reflection data indicates towards the reduction in optical band gap and increase in refractive index of the resulting nanocomposite. The synthesized Ag-PMMA nanocomposite has been found to be more conducting than PMMA as ascertained using I-V studies. The decrease in band gap and increase in conductivity can be correlated due to the formation of localized electronic states in PMMA matrix due to insertion of Ag nanoparticles. The PMMA thin films with dispersed silver nanoparticles may be useful for nanophotonic devices.

scholarly journals A Selective Chemosensor for Mercuric Ions Based on 4-Aminothiophenol-Ruthenium(II) Bis(bipyridine) Complex

2011 ◽  
Vol 2011 ◽  
pp. 1-6 ◽  
Author(s):  
Amer A. G. Al Abdel Hamid ◽  
Mohammad Al-Khateeb ◽  
Ziyad A. Tahat ◽  
Mahmoud Qudah ◽  
Safwan M. Obeidat ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Important Implication ◽  
Spectroscopic Techniques ◽  
Selective Detection ◽  
Conductivity Measurements ◽  
Mercuric Ion ◽  
Vis Spectroscopy ◽  
Mercuric Ions ◽  
Photochemical Properties ◽  
C Nmr

A new ruthenium(II) complex (cis-ruthenium-bis[2,2′-bipyridine]-bis[4-aminothiophenol]-bis[hexafluorophosphate]) has been synthesized and characterized using standard analytical and spectroscopic techniques, FTIR, 1H and 13C-NMR, UV/vis, elemental analysis, conductivity measurements, and potentiometric titration. Investigation of the synthesized complex with metal ions showed that this complex has photochemical properties that are selective and sensitive toward the presence of mercuric ion in aqueous solution. The detection limit for mercuric ions using UV/vis spectroscopy was estimated to be ~ 0.4 ppm. The results presented herein may have an important implication in the development of a spectroscopic selective detection for mercuric ions in aqueous solution.

Studies on fluorescence determination of nanomolar Cr(iii) in aqueous solutions using unmodified silver nanoparticles

2012 ◽  
Vol 4 (10) ◽  
pp. 3407 ◽  
Author(s):  
M. Elavarasi ◽  
Madona L. Paul ◽  
A. Rajeshwari ◽  
N. Chandrasekaran ◽  
A. B. Mandal ◽  
...  
Keyword(s):  
Silver Nanoparticles ◽  
Aqueous Solutions ◽  
Fluorescence Determination

scholarly journals Electrospinning and Catalytic Properties of Cyclodextrin Functionalized Polyoxymethylene (POM) Nanofibers Supported by Silver Nanoparticles

2021 ◽  
Vol 2021 ◽  
pp. 1-9
Author(s):  
C. Q. Zhang ◽  
Y. M. Wang ◽  
S. Z. Li ◽  
X. D. Feng ◽  
L. H. Liu ◽  
...  
Keyword(s):  
Silver Nanoparticles ◽  
Small Molecules ◽  
Ag Nanoparticles ◽  
Waste Treatment ◽  
Organic Dyes ◽  
Average Diameter ◽  
Composite Fiber ◽  
Fiber Mats ◽  
Vis Spectroscopy ◽  
Blend Fiber

A series of novel composite microfibers composed of β-cyclodextrin (β-CDs) functionalized POM (polyoxymethylene) were prepared using electrospining technology with a mixture of hexafluoroisopropanol (HFIP) and N,N-dimethylformamide (DMF) as solvent. The concentration of β-CDs with respect to the POM was varied from 0 to 50 wt.%. The effect of β-CDs content on the morphology of POM/β-CD composite microfiber was investigated. The results showed that the introduction of β-CDs reduced the surface roughness and porosity of the microfibers, and the morphology of the fibers was changed. The increase of β-CDs content from 10% to 50% has led to increased average diameter of POM/β-CD composite fiber from 2.1 μm to 6.4 μm. The mechanical properties of the blend fiber mats were further investigated. In addition, silver nanoparticles were introduced to the POM/β-CD composite microfiber matrices during electrospinning. The POM/β-CD composite fiber allows CDs to form host–guest complexes with various small molecules and macromolecules. The TEM, SEM, XRD, and XPS were utilized to characterize the prepared samples. The data suggest that Ag nanoparticles were homogeneously distributed within the POM/β-CD fibers, and no aggregation was observed. The catalytic activity of Ag nanoparticles was tracked by ultraviolet-visible (UV-vis) spectroscopy which showed excellent catalytic degradation performance of organic dyes in the presence of NaBH4. The Ag/POM/β-CD mats are promising for use in waste treatment, molecular recognition, catalysis, and so on.

Colorimetric sensing of copper ions based on the anti-aggregation of unmodified silver nanoparticles in the presence of 1,4-dithiothreitol

2015 ◽  
Vol 7 (2) ◽  
pp. 566-572 ◽  
Author(s):  
Yingjie Ye ◽  
Yi Guo ◽  
Yuan Yue ◽  
Hanjing Huang ◽  
Longtao Zhao ◽  
...  
Keyword(s):  
Silver Nanoparticles ◽  
Oxidation Reaction ◽  
Copper Ions ◽  
Colorimetric Method ◽  
Selective Detection ◽  
Colorimetric Sensing ◽  
Catalyzed Oxidation

A colorimetric method for the fast, sensitive and selective detection of Cu2+ions with silver nanoparticles is proposed based on a specific Cu2+-catalyzed oxidation reaction.

scholarly journals On the possibility of using «Grand-Potok» unit with MAÉS analyzer for analysis of solutions and water aerosols

2019 ◽  
Vol 85 (1II)) ◽  
pp. 86-90
Author(s):  
G. A. Shevelev ◽  
L. I. Vasilenko ◽  
E. N. Kamenskaya ◽  
T. S. Turmagambetov ◽  
O. M. Pakhorukova ◽  
...  
Keyword(s):  
Silver Nanoparticles ◽  
Laser Ablation ◽  
Aqueous Solutions ◽  
Detection Limits ◽  
Atomic Emission ◽  
Sample Injection ◽  
Input System ◽  
Powder Samples ◽  
Scintillation Method

Modernization of «Grand-Potok» atomic emission complex with MAÉS analyzer («VMK-Optoélektronika», Novosibirsk, Russia) first designed for analysis of powder samples is considered in view of the possibility of analysis of solutions and aqueous aerosols avoiding changes in the sample injection. It is shown that upgraded input system equipped with a nebulizer provides determination of platinum and gold in aqueous solutions with detection limits 1 – 5 ppm. Analysis of water aerosols with silver nanoparticles by scintillation method revealed the possibility of detecting separate silver nanoparticles about 200 nm and more. Thus we have demonstrated that modernization of the complex provides the possibility for analysis of solutions and aerosols obtained upon electro-spark and laser ablation of various materials, as well as for microanalysis of the objects.

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