scholarly journals Green Synthesis of Silver Nanoparticles using Lantana camara Fresh Leaf Extract for Qualitative Detection of Hg2+, Cu2+, Pb2+, and Mn2+ in Aqueous Solution

2021 ◽  
Vol 21 (4) ◽  
pp. 990
Author(s):  
Henry Fonda Aritonang ◽  
Talita Kojong ◽  
Harry Koleangan ◽  
Audy Denny Wuntu
Keyword(s):  
Silver Nanoparticles ◽  
Aqueous Solutions ◽  
Colorimetric Method ◽  
Environmentally Friendly ◽  
Ethanol Extract ◽  
Lantana Camara ◽  
Colloidal Synthesis ◽  
Distilled Water ◽  
Average Size ◽  
Almost All

This research was focused on the discovery of new environmentally friendly sensors based on nanoscale materials whose main purpose was to detect the presence of heavy metals in aqueous solutions. The environmentally friendly extracellular biosynthetic technique was applied to produce silver nanoparticles (AgNps). The reducing agents used were distilled water and ethanol extract obtained from fresh leaves of Lantana camara. The silver-containing extracts (Ag-extract) were then used to detect the presence of Hg2+, Cu2+, Pb2+, and Mn2+ in aqueous solutions by the colorimetric method using UV-visible spectroscopy. The colloidal synthesis of AgNPs was then monitored by the same method. The spectrum obtained showed peaks between 430 and 450 nm according to the Plasmon absorbance of AgNP. AgNPs' size and shape were characterized using the Transmission Electron Microscopy (TEM) technique, which showed the average size varies from 1.6 to 25 nm. The colorimetric data showed that Ag-extract, both of distilled water or ethanol solvents, was the best for detecting the presence of Hg2+ followed by Mn2+. On the other hand, Ag-extract in distilled water cannot detect Cu2+, Pb2+, and Mn2+ ions, while almost all Ag-extracts in ethanol solvents could identify the presence of these metals.

scholarly journals DETERMINING OPTIMIZED CONDITIONS FOR REMOVAL OF CHLOROPHYLL IN EXTRACTED LIQUID FROM NEEM LEAVES BY DISTILLED WATER BY RESPONSE SURFACE METHOD

2011 ◽  
Vol 14 (4) ◽  
pp. 36-42
Author(s):  
Do Van Vu ◽  
Nguyen Hong Nguyen ◽  
Tri Ly Minh Nguyen
Keyword(s):  
Response Surface ◽  
Response Surface Method ◽  
Ethanol Extract ◽  
Distilled Water ◽  
Surface Method ◽  
Neem Leaves ◽  
Initial Content ◽  
Almost All ◽  
Optimized Conditions ◽  
And Storage

Chlorophyll content in liquid ethanol extract of neem’s leaves has bad effect on quality and storage time of the extract. In this study, we tried to remove remaining chlorophyll in the liquid ethanol extract of neem’s leaves by distilled water. The results showed that after chlorophyll removing, the liquid extract still retained almost all the biological activity ingredients (limonoid). Three effecting factors, i.e., (i) The time to cool to precipitate chlorophyll in the extracted liquid, (ii) The initial content of chlorophyll; (iii) The ratio between the extracted liquid and distilled water added all affect chlorophyll removal efficiency, have been studied. The Response Surface Method (RSM) showed that, the optimal conditions for removing chlorophyll process, the ratio between extracted liquid and distilled water respectively is 16.8 μg/ml and 1.3 (13:10; v:v). The time to cool to precipitate chlorophyll in the extracted liquid didi not have significantly affect on the performance of the removing chlorophyll’s contents.

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.

ACOUSTIC PANEL CHICKEN FEATHER WASTE ENVIRONMENTALLY FRIENDLY

2020 ◽  
Author(s):  
Ansarullah ◽  
Ramli Rahim ◽  
Baharuddin Hamzah ◽  
Asniawaty Kusno ◽  
Muhammad Tayeb
Keyword(s):  
Animal Feed ◽  
Environmentally Friendly ◽  
Selling Price ◽  
Chicken Feather ◽  
Chicken Feathers ◽  
The Road ◽  
Feather Waste ◽  
Chicken Feather Waste ◽  
Almost All ◽  
The Impact

Chicken feathers are the result of waste from slaughterhouses and billions ofkilograms of waste produced by various kinds of poultry processing. This hal is a veryserious problem for the environment because it causes the impact of pollution. Hasmany utilization of chicken feather waste such as making komocen, accessories,upholstery materials, making brackets to the manufacture of animal feed but from theresults of this activity cannot reduce the production of chicken feathers that hiscontinuously increase every year. This is due to the fact that the selling price of chickenmeat has been reached by consumers with middle to upper economic levels. This caneasily be a chicken menu in almost all restaurants and restaurants to the food stalls onthe side of the road. An alternative way of utilizing chicken feathers is to makecomposite materials in the form of panels. Recent studies have shown that the pvacmaterial can be utilized as a mixing and adhesive material with mashed or groundfeathered composites to form a panel that can later be used as an acoustic material.The test results show that the absorption of chicken feathers and pvac glue into panelscan absorb sound well with an absorption coefficient of 0.59, light. This result is veryeconomical so it is worth to be recommended as an acoustic material. Apart from theresults of research methods carried out is one of the environmentally friendly activitiesin particular the handling of waste problems

scholarly journals Functional Attributes of Myco-Synthesized Silver Nanoparticles from Endophytic Fungi: A New Implication in Biomedical Applications

Biology ◽  
2021 ◽  
Vol 10 (6) ◽  
pp. 473
Author(s):  
Prabu Kumar Seetharaman ◽  
Rajkuberan Chandrasekaran ◽  
Rajiv Periakaruppan ◽  
Sathishkumar Gnanasekar ◽  
Sivaramakrishnan Sivaperumal ◽  
...  
Keyword(s):  
Silver Nanoparticles ◽  
Culture Filtrate ◽  
Morphological Changes ◽  
Xrd Analysis ◽  
Penicillium Oxalicum ◽  
Breast Cancer Cell Lines ◽  
Face Centered Cubic ◽  
Tem Analysis ◽  
X Ray ◽  
Average Size

To develop a benign nanomaterial from biogenic sources, we have attempted to formulate and fabricate silver nanoparticles synthesized from the culture filtrate of an endophytic fungus Penicillium oxalicum strain LA-1 (PoAgNPs). The synthesized PoAgNPs were exclusively characterized through UV–vis absorption spectroscopy, Fourier Transform Infra-Red spectroscopy (FT-IR), X-ray powder diffraction (XRD), and Transmission Electron Microscopy (TEM) with energy dispersive X-ray spectroscopy (EDX). The synthesized nanoparticles showed strong absorbance around 430 nm with surface plasmon resonance (SPR) and exhibited a face-centered cubic crystalline nature in XRD analysis. Proteins presented in the culture filtrate acted as reducing, capping, and stabilization agents to form PoAgNPs. TEM analysis revealed the generation of polydispersed spherical PoAgNPs with an average size of 52.26 nm. The PoAgNPs showed excellent antibacterial activity against bacterial pathogens. The PoAgNPs induced a dose-dependent cytotoxic activity against human adenocarcinoma breast cancer cell lines (MDA-MB-231), and apoptotic morphological changes were observed by dual staining. Additionally, PoAgNPs demonstrated better larvicidal activity against the larvae of Culex quinquefasciatus. Moreover, the hemolytic test indicated that the as-synthesized PoAgNPs are a safe and biocompatible nanomaterial with versatile bio-applications.

scholarly journals Green Synthesized Silver Nanoparticles Immobilized on Activated Carbon Nanoparticles: Antibacterial Activity Enhancement Study and Its Application on Textiles Fabrics

Molecules ◽  
2021 ◽  
Vol 26 (13) ◽  
pp. 3790
Author(s):  
Pratama Jujur Wibawa ◽  
Muhammad Nur ◽  
Mukhammad Asy’ari ◽  
Wijanarka Wijanarka ◽  
Heru Susanto ◽  
...  
Keyword(s):  
Silver Nanoparticles ◽  
Antibacterial Activity ◽  
Activated Carbon ◽  
Aloe Vera ◽  
Particle Size Analysis ◽  
Size Analysis ◽  
E Coli ◽  
Transmission Electron ◽  
Average Size ◽  
Green Synthesized Silver Nanoparticles

This research aimed to enhance the antibacterial activity of silver nanoparticles (AgNPs) synthesized from silver nitrate (AgNO3) using aloe vera extract. It was performed by means of incorporating AgNPs on an activated carbon nanoparticle (ACNPs) under ultrasonic agitation (40 kHz, 2 × 50 watt) for 30 min in an aqueous colloidal medium. The successful AgNPs synthesis was clarified with both Ultraviolet-Visible (UV-Vis) and Fourier Transform Infrared (FTIR) spectrophotometers. The successful AgNPs–ACNPs incorporation and its particle size analysis was performed using Transmission Electron Microscope (TEM). The brown color suspension generation and UV-Vis’s spectra maximum wavelength at around 480 nm confirmed the existence of AgNPs. The particle sizes of the produced AgNPs were about 5 to 10 nm in the majority number, which collectively surrounded the aloe vera extract secondary metabolites formed core-shell like nanostructure of 8.20 ± 2.05 nm in average size, while ACNPs themselves were about 20.10 ± 1.52 nm in average size formed particles cluster, and 48.00 ± 8.37 nm in average size as stacking of other particles. The antibacterial activity of the synthesized AgNPs and AgNPs-immobilized ACNPs was 57.58% and 63.64%, respectively (for E. coli); 61.25%, and 93.49%, respectively (for S. aureus). In addition, when the AgNPs-immobilized ACNPs material was coated on the cotton and polyester fabrics, the antibacterial activity of the materials changed, becoming 19.23% (cotton; E. coli), 31.73% (polyester; E. coli), 13.36% (cotton; S. aureus), 21.15% (polyester; S. aureus).

Penetration Dynamics of Solid Particles into Liquids High-Speed Experimental Results and Modelling

2005 ◽  
Vol 473-474 ◽  
pp. 429-434 ◽  
Author(s):  
Olga Verezub ◽  
György Kaptay ◽  
Tomiharu Matsushita ◽  
Kusuhiro Mukai
Keyword(s):  
Contact Angle ◽  
Particle Size ◽  
Aqueous Solutions ◽  
Particle Velocity ◽  
Weber Number ◽  
High Speed ◽  
Solid Particles ◽  
Bulk Liquid ◽  
Distilled Water ◽  
Critical Weber Number

Penetration of model solid particles (polymer, teflon, nylon, alumina) into transparent model liquids (distilled water and aqueous solutions of KI) were recorded by a high speed (500 frames per second) camera, while the particles were dropped from different heights vertically on the still surface of the liquids. In all cases a cavity has been found to form behind the solid particle, penetrating into the liquid. For each particle/liquid combination the critical dropping height has been measured, above which the particle was able to penetrate into the bulk liquid. Based on this, the critical impact particle velocity, and also the critical Weber number of penetration have been established. The critical Weber number of penetration was modelled as a function of the contact angle, particle size and the ratio of the density of solid particles to the density of the liquid.

Shear degradation resistance of star poly(ethyleneimine) - polyacrylamides during elongational flow

e-Polymers ◽  
2011 ◽  
Vol 11 (1) ◽  
Author(s):  
Ming Duan ◽  
Shenwen Fang ◽  
Liehui Zhang ◽  
Fuxiao Wang ◽  
Peng Zhang ◽  
...  
Keyword(s):  
Shear Rate ◽  
Aqueous Solutions ◽  
Relative Viscosity ◽  
Reduction Rate ◽  
Elongational Flow ◽  
Exponential Dependence ◽  
Distilled Water ◽  
Shear Stability ◽  
Low Viscosity ◽  
Shear Degradation

AbstractAn experimental study of the flow-induced scission behaviour of four star hydrolyzed polyacrylamides (HPMA) with different arms during planar elongational flow in a cross-slot flow cell is described. The results showed that the shear stability of linear HPAM in distilled water was not essentially different from star HPAM. Polymer scission was not observed in either system in a shear rate range from 20,000 to 100,000s-1, which can be attributed to the strong polyelectrolyte behaviour of HPAM in distilled water. However, at the same shear rate, the star HPAMs exhibited superior shear stability in comparison to the linear HPAMs in aqueous solutions containing NaCl (CNaCl=0.2-1.0%wt) and, in particular, the initial reduction rate of relative viscosity (R) decreased with the degree of branching of the HPAMs. In addition, it was found that the R of five HPAMs in NaCl aqueous solutions exhibited an exponential dependence on shear rate, in which the coefficient C1 can be used to quantitatively evaluate shear stability. In star HPAM NaCl aqueous solutions, the increase of R with shear rate is very likely due to the decrease of the hydrodynamic radius (Rh) of these HPAMs, while the increase of R with NaCl concentrations can be attributed to the relatively low viscosity of these polymers at high NaCl concentrations.

Silver nanoparticles induce cytotoxicity, but not cell transformation or genotoxicity on Balb3T3 mouse fibroblasts

2013 ◽  
Vol 14 (1-2) ◽  
pp. 49-60 ◽  
Author(s):  
Francesca Broggi ◽  
Jessica Ponti ◽  
Guido Giudetti ◽  
Fabio Franchini ◽  
Vicki Stone ◽  
...  
Keyword(s):  
Silver Nanoparticles ◽  
Cell Transformation ◽  
Micronucleus Test ◽  
Chemical Properties ◽  
Neoplastic Transformation ◽  
Research Centre ◽  
Ag Nps ◽  
Joint Research ◽  
Ic50 Values ◽  
Average Size

AbstractSilver nanoparticles (Ag NPs) are one of the most common nanomaterials present in nanotechnology-based products. Here, the physical chemical properties of Ag NPs suspensions of 44 nm, 84 nm and 100 nm sizes synthesized in our laboratory were characterized. The NM-300 material (average size of 17 nm), supplied by the Joint Research Centre Nanomaterials Repository was also included in the present study. The Ag NPs potential cytotoxicity was tested on the Balb3T3 cell line by the Colony Forming Efficiency assay, while their potential morphological neoplastic transformation and genotoxicity were tested by the Cell Transformation Assay and the micronucleus test, respectively. After 24 h of exposure, NM-300 showed cytotoxicity with an IC50 of 8 µM (corresponding to 0.88 µg/mL) while for the other nanomaterials tested, values of IC50 were higher than 10 µM (1.10 µg/mL). After 72 h of exposure, Ag NPs showed size-dependent cytotoxic effect with IC50 values of 1.5 µM (1.16 µg/mL) for NM-300, 1.7 µM (1.19 µg/mL) for Ag 44 nm, 1.9 µM (0.21 µg/mL) for Ag 84 nm and 3.2 µM (0.35 µg/mL) for Ag 100 nm. None of the Ag NPs tested was able to induce either morphological neoplastic transformation or micronuclei formation.

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