Ecofriendly synthesis and applications of silver nanoparticles (original) (raw)
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Journal of Physics: Conference Series
The synthesis of silver nanoparticles by using the leaves extract of Abelmoschus esculentus as a bio-reductor agent have been conducted. Leaf extract produced by using the boiling process of the leaves in boiling water. Ag+ ions as a source of silver metal formed by dissolving AgNO3 into distilled water. A solution containing Ag+ ions was added to the leaf extract of Abelmoschus esculentus, followed by an incubation process accompanied by stirring at medium speed. Silver nanoparticles formed were characterised by UV-VIS, FT-IR, PSA and SEM. Based on the results known that the highest nanoparticles formed during the incubation period of 6 days with the size of silver nanoparticles mostly less than 100 nm. SEM results show that silver nanoparticles have a non-uniform cubic shape morphology. Band gap energy for each incubation period 1; 2; 3; 6 and 7 days are 2.263 eV; 2.228 eV; 2.227 eV; 2.096 eV; and 2.227 eV respectively.
ChemInform Abstract: Innovative Eco-Friendly Approaches for Green Synthesis of Silver Nanoparticles
ChemInform, 2015
Nanotechnology is an escalating field that has made its contribution to all spheres of human life. The green synthesis of nanoparticles has paved for better methodologies and approaches in the medicinal field. Nowadays silver, gold and other metallic nanoparticles are used as an efficient carrier for drug molecules for developing novel drug delivery systems. In course of synthesizing these nanoparticles various chemicals, solvents and reagents are used which harms our eco system directly or indirectly. Silver nanoparticles (Ag NPs) have been widely used as a novel therapeutic agent extending its use as antibacterial, antifungal, anti-viral and anti-inflammatory agent. Silver nanoparticles (Ag NPs) prepared by green synthesis have many advantages over conventional methods involving chemical agents associated with environmental toxicity. Green synthetic methods include polysaccharide method, irradiation method, biological method, polyoxometallates method and tollens method. Green synthesis of nanoparticles is found to be an emerging branch of nanotechnology. The use of environmentally benign materials like plant leaf extract for the synthesis of nanoparticles offers numerous benefits of eco-friendliness and compatibility for pharmaceutical and biomedical applications as they do not use toxic chemicals in the synthesis protocols. Rapid and green synthetic methods using various plant extracts have shown a great potential in silver nanoparticles (Ag NPs) synthesis. This review article describes the bio-inspired synthesis of nanoparticles that provides advancement over chemical and physical methods as it is cost effective, eco-friendly and more effective in a variety of applications.
Synthesis and characterization of silver nanoparticles via green route
Korean Journal of Chemical Engineering, 2016
The development of competent green chemistry methods for synthesis of metal nanoparticles has become a main focus of researchers. In this study we report the green synthesis of silver nanoparticles (AgNps) by reduction of silver nitrate, using leaf broth of Azadirakta indica (Neem). The plant leaf broth simultaneously acts as reducing agent as well as capping agent at 30 o C. The effect of different concentration of silver ions, percentage of leaf broth and temperature on morphology of dispersed silver nanoparticles was studied. The formation of silver nanoparticles in dispersion was monitored through the analysis of absorbance spectra by UV-Visible spectrophotometer at different stages during the process of synthesis. Scanning electron microscopy (SEM) and transmission electron microscopy (TEM) analysis revealed that silver nanoparticles were pure and monodispersed and size was ranging from 9-56 nm. Fourier transform infrared (FTIR) analysis indicates prominent bands of absorbance, which are responsible for reducing of Ag + ions and stabilization of obtained silver nanoparticles. Results confirmed this protocol as simple, rapid, cost effective, eco-friendly and alternative conventional physical/chemical methods.
Plant extract are very cost effective and eco-friendly, thus can be an economic and efficient alternate for the large-scale synthesis of nanoparticles. The preparation of stable, uniform silver nanoparticles by reduction of silver ions with Emblica officinalis, Terminalia catappa and Eucalyptus hybrida extract is reported in the present paper. It is a simple process of global research interest for obtaining silver nanoparticles in least amount of time. These nanoparticles were characterized with UV-Vis spectroscopy, X-ray diffraction (XRD), transmission electron microscopy (TEM) and energy different X- ray (EDX) analysis which revealed that the silver nanoparticles are polydisperse and of different morphologies ranging from 20 to 80 nm in size. XRD results reveal that these nanostructures exhibits a face-centered cubic crystal structure. The UV/Vis spectra absorption peak confirms their production. Pioneering of reliable and eco-friendly process for synthesis of metallic nanoparticles biologically is an important step in the field of application of nanobiotechnology. Thus, these silver nanoparticles (Ag-NPs) may prove as a better candidate for drugs and can potentially eliminate the problem of chemical agents because of their biogenic nature. The indiscriminate use of antibiotics has fueled the development of drug resistance at an alarming rate. To overpower this burning problem, the AgNPs may prove to be a universal solution.
In this study silver nanoparticles were biosynthesized using Abelmoschus esculentus (Okra) processing waste aqueous extract and test their antibacterial and cytotoxic activities. The production of biosynthesized silver nanoparticles (AgNPs) was monitored using UV-visible spectrophotometer and their size was estimated by transmission electron microscopy (TEM). The average particle size of biosynthesized AgNPs was found to be approximately 10 nm. The antibacterial activity of biosynthesized AgNPs was tested against three Gram positive and three Gram negative bacteria. The results showed that biosynthesized AgNPs have a strong inhibitory effect on all studied bacteria with a more pronounced inhibition against Gram positive bacteria. Results of the cytotoxicity test of AgNPs on hepatic carcinoma cells (HEPG2) was shown to be limited and concentration dependent. The present work highlight a green pathway for the synthesis of silver nanoparticles using okra fruit waste which is a cost effective and eco-friendly alternative to conventional chemical methods of synthesis.
Biological synthesis of silver nanoparticles using Abelmoschus moschatus
2014
Abelmoschus moschatus Medik (Family: Malvaceae) is commercially valued for the ambrette oil obtained from its seeds. This plant source of musk is an economical, ethical substitute for animal musk and a healthier alternative. Supplementary uses of plant parts would enhance the economic value of the plant. Nanoparticles of gold, silver, iron and zinc have received a great deal of attention due to the altered properties of the constituent metal. In the present study, stable silver nanoparticles were biosynthesized using an aqueous extract of A. moschatus. The obtained silver nanoparticles were analyzed using UVVis spectrophotometry, Dynamic light scattering, Energy dispersive X-ray spectroscopy and Fourier transform infrared spectroscopy. The antimicrobial activity of silver nanoparticles was also demonstrated against some Gram positive and Gram negative bacteria.
Sustainable Nanotechnology- Green Synthesis Methods for Silver Nanoparticles
International Journal of Scientific Research in Science and Technology, 2023
Silver has a long history of being an excellent substance in its field of medicine Because of their special qualities, they have been used for a wide range of products, including antibacterial agents, household, industrial, and healthcare-related items, coatings for medical devices, drug delivery, and eventually to increase the tumor-killing effects of anticancer drugs. By the help of nanotechnology pure silver nanoparticles is obtained. The bioreduction of metal ions into their elemental form in the size range of 1–100 nanometers (nm) is known as "green synthesis," and it requires the use of plants or plant parts. As a result, the biological activities are increased and the toxicity level is decreased when AgNPs are synthesised using a green method. Scientists and researchers from various fields are becoming more and more interested in synthesising nanoparticles, particularly silver nanoparticles. However, they are unsure of the proper procedures to follow and the safety precautions to take when synthesising AgNPs, which is why the main goal of this paper is to provide a detailed methodology for the environmentally friendly synthesis of silver nanoparticles.
IJERT-Synthesis and Characterization of Silver Nanoparticles from Ecofriendly Materials: A Review
International Journal of Engineering Research and Technology (IJERT), 2020
https://www.ijert.org/synthesis-and-characterization-of-silver-nanoparticles-from-ecofriendly-materials-a-review https://www.ijert.org/research/synthesis-and-characterization-of-silver-nanoparticles-from-ecofriendly-materials-a-review-IJERTV9IS090402.pdf Recently, silver nanoparticles have been investigated by various researchers due to their unusual optical, electronic and chemical properties. Likewise, depending on their size and shape, many possibilities with respect to technological applications have been advanced. Silver nanoparticle has been discovered as one of the inorganic nano-materials suitable as antimicrobial agents. Hence, synthesis of silver nanoparticles from leaf extracts of numerous plants has been evolving as a cost effective and environmental friendly alternative to chemical and physical methods. The use of plants as major materials for the synthesis of nanoparticles is a green chemistry approach that interconnects nanotechnology and plant biotechnology. The focus of the present review is to examine the various means of synthesis of silver nanoparticles (Ag-NP) using different methods, plant extracts and their characterization as appropriate materials for diverse engineering applications.
Investigation of the Effect of Extracts on the Green Synthesis of Silver Nanoparticles
2017
Nanoparticles bio production, considering their performance in medicine and biological science, is increasing; also, raising awareness of green chemistry and bioprocesses has encouraged the use of environmentally friendly methods for the production of non-toxic nanomaterials. Also uses of plants extracts are found to be more advantageous over chemical, physical and microbial (bacterial, fungal, algal) methods for silver nanoparticles (AgNPs) synthesis.The objectives of this study were the production of silver nanoparticles using aqueous and hydroalcoholic extracts of Avena sativa L. and investigation of the effect of extracts on the synthesis of nanoparticles. The morphology and size of the nanoparticles were determined using Scanning Electron Microscope (SEM) and UV-Vis spectroscopy. SEM images showed that the synthesized nanoparticles were mainly spherical and round shaped. The results indicated that synthesized nanoparticles using aqueous extract were better than the synthesized ...