scholarly journals Photocatalytic degradation of organic pollutants using Trianthema Portulastrum leaf extract based CeO2 nanoparticles

2020 ◽  
Vol 16 (10) ◽  
pp. 765-778
Author(s):  
Swetharanyam Swetharanyam ◽  
Keyword(s):  
Leaf Extract ◽  
Antioxidant Activities ◽  
Dye Degradation ◽  
Visible Spectrum ◽  
X Ray Diffraction ◽  
Low Concentrations ◽  
Ft Ir ◽  
Photoluminescence Studies ◽  
Antibacterial And Antioxidant Activity ◽  
High Inhibition

Comparison of bio CeO2-Nps prepared using Trianthema Portulastrum leaf extract with chemical CeO2-Nps is of interest. The ultraviolet - visible, x-ray diffraction, HR - TEM, FT - IR, and photoluminescence studies were conducted with CeO2-Nps. UV–Maximum absorptionat 292 nm was completed using UV-visible spectrum. The HR–TEM images showed 38 nm bio CeO2-Nps with spherical morphology. This showed the polycrystalline character of CeO2-Nps similar to XRD data. The presence of metal oxide is confirmed by FT - IR analyses. The CeO2-Nps showed the potential photocatalytic activity for Acid black 1 color degradation after exposure to sunlight. Chem and bio CeO2-Nps have a degradation rate of 86.66 and 94.33%, respectively for acid black 1 dye. The synthesized CeO2-Nps are also evaluated for antibacterial and antioxidant activity. The bio CeO2-Nps has antibacterial activity for Pseudomonas aeruginosa (17 ± 0.56 mm) and Staphylococcus aureus (16 ± 0.24 mm) at low concentrations of 100 μl. The CeO2-Nps bio showed high inhibition of radical DPPH IC50 μg/ml, at 95.17 ± 21. Thus, we show that CeO2-Nps have environmentally friendly properties that are useful for dye degradation with antimicrobial and antioxidant activities.

scholarly journals Bio Synthesis and Characterization of Silver Nanoparticles Using Lagenaria siceraria Leaf Extract and their Antibacterial Activity

2014 ◽  
Vol 38 ◽  
pp. 35-45 ◽  
Author(s):  
B. Anandh ◽  
A. Muthuvel ◽  
M. Emayavaramban
Keyword(s):  
Silver Nanoparticles ◽  
Leaf Extract ◽  
Face Centered Cubic ◽  
Lagenaria Siceraria ◽  
Human Pathogens ◽  
X Ray Diffraction ◽  
Visible Spectroscopy ◽  
X Ray ◽  
Ft Ir ◽  
Uv Visible

The present investigation demonstrates the formation of silver nanoparticles by the reduction of the aqueous silver metal ions during exposure to the Lagenaria siceraria leaf extract. The synthesized AgNPs have characterized by UV-visible spectroscopy, X-ray diffraction (XRD) and Fourier transform infrared spectroscopy (FT-IR) techniques. AgNPs formation has screened by UV-visible spectroscopy through colour conversion due to surface plasma resonance band at 427 nm. X-ray diffraction (XRD) confirmed that the resulting AgNPs are highly crystalline and the structure is face centered cubic (fcc). FT-IR spectrum indicates the presence of different functional groups present in the biomolecules capping the nanoparticles. Further, inhibitory activity of AgNPs and leaf extract were tested against human pathogens like gram-pastive (Staphylococcus aureus, Bacillus subtilis), gram-negative (Escherichia coli and Pseudomonas aeruginosa). The results indicated that the AgNPs showed moderate inhibitory actions against human pathogens than Lagenaria siceraria leaf extract, demonstrating its antimicrobial value against pathogenic diseases

Microwave-Hydrothermal Synthesis and Characterization of Graphene

2012 ◽  
Vol 602-604 ◽  
pp. 917-920 ◽  
Author(s):  
Zhen Hui Xiao ◽  
Shui Sheng Wu ◽  
Yan Lin Sun ◽  
Yu Lin Zhao ◽  
Ya Ming Wang
Keyword(s):  
Chemical Reduction ◽  
Visible Spectrum ◽  
Synthesis And Characterization ◽  
X Ray Diffraction ◽  
X Ray ◽  
Microwave Hydrothermal ◽  
Ft Ir ◽  
Uv Visible ◽  
Scanning Electron

Graphene was synthesized by microwave-hydrothermal chemical reduction of graphite oxide using hydrazine hydrate as the reducing agent. Graphene was characterized using X-ray diffraction, UV-visible spectrum, FT-IR spectrum and scanning electron microscopy. Results indicated that the as-prepared graphene was wrinkled and comprised fewer graphenes with a highly crystalline structure.

Biosynthesis of silver nanoparticles using lavender leaf and their applications for catalytic, sensing, and antioxidant activities

2016 ◽  
Vol 5 (6) ◽  
Author(s):  
Brajesh Kumar ◽  
Kumari Smita ◽  
Luis Cumbal
Keyword(s):  
Silver Nanoparticles ◽  
Leaf Extract ◽  
Antioxidant Activities ◽  
Present Report ◽  
X Ray Diffraction ◽  
Visible Spectroscopy ◽  
X Ray ◽  
Transmission Electron ◽  
Red Color ◽  
Uv Visible

AbstractThe present report summarizes an eco-friendly approach for the biosynthesis of silver nanoparticles (AgNPs) using the leaf extract of lavender. Initially, the synthesis of AgNPs was visually observed by the appearance of a wine red color. The optical property, morphology, and structure of as-synthesized AgNPs were characterized by UV-visible spectroscopy, dynamic light scattering, transmission electron microscopy, and X-ray diffraction analyses. All characterization data revealed the formation of crystalline and spherical AgNPs (Ag/Ag

scholarly journals Antimicrobial Brazilian Propolis (EPP-AF) Containing Biocellulose Membranes as Promising Biomaterial for Skin Wound Healing

2013 ◽  
Vol 2013 ◽  
pp. 1-10 ◽  
Author(s):  
Hernane da Silva Barud ◽  
Adalberto Miguel de Araújo Júnior ◽  
Sybele Saska ◽  
Letícia Boldrin Mestieri ◽  
Juliana Alvares Duarte Bonini Campos ◽  
...  
Keyword(s):  
Wound Healing ◽  
Antioxidant Activities ◽  
Antibacterial Properties ◽  
Skin Wound ◽  
X Ray Diffraction ◽  
Skin Wound Healing ◽  
Ft Ir ◽  
Brazilian Propolis ◽  
Dose Dependent ◽  
Ft Ir Spectroscopy

Among remarkable discoveries concerning propolis, such as antifungal, antiviral, and antioxidant activities, its anti-inflammatory, and mainly its antibacterial, properties deserve special attention when skin wound healing is concerned. Based on this and knowing the distinctive performance of bacterial (BC) membranes on wound healing, in this work it is proposed to demonstrate the potent antimicrobial activity and wound healing properties of a novel propolis containing biocellulose membrane. The obtained propolis/BC membrane was able to adsorb propolis not only on the surface, but also in its interstices demonstrated by scanning electron microscopy, X-ray diffraction, Fourier transform infrared (FT-IR) spectroscopy, and thermogravidimetric assays. Additionally, the polyphenolic compounds determination and the prominent antibacterial activity in the membrane are demonstrated to be dose dependent, supporting the possibility of obtaining propolis/BC membranes at the desired concentrations, taking into consideration its application and its skin residence time. Finally, it could be suggested that propolis/BC membrane may favor tissue repair in less time and more effectively in contaminated wounds.

scholarly journals Biosynthetic Greener Move towards Nanosized Silver by Diospyros Montana Leaf Extract and Their Antimicrobial and Antioxidant Activities

2020 ◽  
Vol 8 (5) ◽  
pp. 4864-4869
Keyword(s):  
Leaf Extract ◽  
Antioxidant Activities ◽  
Radical Scavenging ◽  
Volume Ratio ◽  
Ultra Violet ◽  
Nanosized Particles ◽  
X Ray Diffraction ◽  
Green Approach ◽  
Transmission Electron ◽  
Excellent Activity

Synthesis of nanomaterials by eco-friendly method is being exploited by chemists because of several advantages over other conventional techniques. The current investigation reports the green approach for Diospyros Montana(DM) silver nanosized particles which has high antimicrobial and antioxidant activities. The synthesized nanosized particles were investigated by several techniques such as IR, Ultra violet, X-Ray Diffraction, Transmission Electron Microscope and AFM studies. Crystalline size of the silver nanoparticle is in the range of 47.05 nm which was clear from the powder X-rd studies. The silver nanoparticls prepared were tested for their antimicrobial potential against E.coli, B.subtilis, C.albicans and A.flavus species and was found to reveal excellent activity because of its volume ratio and high surface.The DPPH assy was used to find scavenging activity of free radicals. In this work we report the silver nanoparticles by aqueous Diospyros Montana leaf extract and its potential for free radical scavenging.

Fabrication of g-C3N4 Microspheres without Template via Microwave Heating Method

2017 ◽  
Vol 727 ◽  
pp. 284-288
Author(s):  
Yong Zhi Yu ◽  
Ji Gang Wang
Keyword(s):  
Microwave Heating ◽  
Shell Thickness ◽  
Carbon Nitride ◽  
Visible Spectrum ◽  
X Ray Diffraction ◽  
Heating Method ◽  
X Ray ◽  
Intrinsic Semiconductor ◽  
Ft Ir ◽  
Scanning Electron

This research reported the preparation of the graphitic carbon nitride (g-C3N4) microspheres without template via microwave heating method using melamine as precursor. The as-synthesized samples were characterized by powder X-ray diffraction (XRD), fourier transform infrared spectroscopy (FT-IR), field-emission scanning electron microscopy (FE-SEM), ultraviolet-visible (UV-Vis) and photoluminescence (PL). Results showed that the g-C3N4 microspheres were successfully synthesized. The diameters of the microspheres range from 800 nm to 1.5 μm, and the shell thickness is about 50 nm. UV-Vis absorption edge and PL peak of the g-C3N4 were shown at 457 nm and 468 nm, respectively, indicating the intrinsic semiconductor-like absorption in the blue region of the visible spectrum. This was the first attempt to prepare g-C3N4 microspheres without template via microwave heating approach, which was proved to be facile and effective.

scholarly journals BIOSYNTHESIS OF COPPER NANOPARTICLES USING PARTHENIUM HYSTEROPHORUS LEAF EXTRACT AND SCREENING ITS ANTIMICROBIAL ACTIVITY

2019 ◽  
pp. 93-99
Author(s):  
ROHINI SAHAYA MARY ◽  
MAHESH MK ◽  
PRUTHVI ML
Keyword(s):  
Copper Nanoparticles ◽  
Leaf Extract ◽  
Color Change ◽  
Morphological Characteristics ◽  
Antimicrobial Activities ◽  
Parthenium Hysterophorus ◽  
Diffusion Method ◽  
X Ray Diffraction ◽  
Resonance Band ◽  
High Inhibition

Objective: The aim of this study is to synthesis the copper nanoparticles (CuNPs) using the leaf extract of Parthenium hysterophorus. Methods: Dry and fresh leaf extract was prepared and CuSo4 was added. The color change was noted and recorded by ultraviolet–visible spectrophotometer. The morphological characteristics were analyzed by scanning electron microscopy (SEM). Antimicrobial activities were performed by the disc diffusion method. Results: The color change indicates the production of CuNPs. Surface plasmon resonance band was observed around 599 nm and 572 nm for fresh and dry samples of P. hysterophorus leaf extract. SEM confirms the formation and the crystalline nature of CuNPs and X-ray diffraction studies show the particle size. The antibacterial potentials of the CuNPs were studied and have shown good high inhibition activity against Staphylococcus aureus, Bacillus subtilis, Proteus vulgaris, and Pseudomonas aeruginosa at different concentrations in compare to fungi species. Conclusion: This method is effective and environmental friendly for the synthesis of CuNPs using leaf extract of Parthenium hysterophorus.

Effect of Magnetite Nanoparticles Doped Glass with Enhanced Verdet Constant for Magnetic Optical Current Transducer Applications

2011 ◽  
Vol 271-273 ◽  
pp. 13-18 ◽  
Author(s):  
Qiu Ling Chen ◽  
Lin Wan ◽  
Qiu Ling Chen ◽  
Meng Zhang
Keyword(s):  
Fe3o4 Nanoparticles ◽  
Glass Melting ◽  
X Ray Diffraction ◽  
Verdet Constant ◽  
Low Concentrations ◽  
Current Transducer ◽  
Doped Glasses ◽  
Ft Ir ◽  
Doped Glass ◽  
B2o3 Glass

. Fe3O4 nanoparticles were synthesized and doped into two glass systems (Na2O-B2O3 glass and PbO-Bi2O3-B2O3-GeO2 glasses) at low concentrations using traditional glass melting method. The formation of Fe3O4 nanoparticles was obtained through coprecipitation of Fe(II) and Fe(III) in alkaline media.The size of the Fe3O4 nanoparticles was observed to be around 15 nm. The structure and properties of doped glasses were studied by X-ray diffraction (XRD), scanning electric microscope (SEM), UV-VIS spectray, FT-IR spectray analysis and Faraday rotation test. Compared to the host glass, Fe3O4 nanoparticles doped glasses shown enhanced Faraday Effect in term of Verdet constant and will have potential application in magneto-optical devices.

scholarly journals Evaluation of three different green fabrication methods for the synthesis of crystalline ZnO nanoparticles using Pelargonium zonale leaf extract

2019 ◽  
Vol 8 (1) ◽  
pp. 302-308 ◽  
Author(s):  
Afsaneh Vahidi ◽  
Hamideh Vaghari ◽  
Yahya Najian ◽  
Mohammad Javad Najian ◽  
Hoda Jafarizadeh-Malmiri
Keyword(s):  
Microwave Irradiation ◽  
Leaf Extract ◽  
Antioxidant Activities ◽  
Antibacterial Activities ◽  
Conventional Heating ◽  
Diffusion Method ◽  
Average Crystalline Size ◽  
Zno Nps ◽  
Pelargonium Zonale ◽  
Ft Ir

Abstract Zinc oxide nanoparticles (ZnO NPs) were green synthesized using Pelargonum zonale leaf extract under three different heating methods, and their characteristics were evaluated using X-ray diffractometry (XRD), Fourier-transform infrared spectroscopy (FT-IR), scanning electron microscopy (SEM), 2,2-diphenyl-2-picrylhydrazyl (DPPH) assay and antibacterial well diffusion method. The FT-IR analysis indicated that the Pelargonium leaf extract contained hydroxyl and amide I groups which were related to the proteins, carbohydrate, tannins and phenolic compounds of the extract and had an essential role in the reduction of the zinc ions and synthesis of the ZnO NPs. The obtained results revealed that the synthesized spherical individual ZnO NPs as well as the number of aggregates using microwave irradiation, autoclave and conventional heating (heater-stirrer) methods had average crystalline size of 51, 60 and 61 nm. Furthermore, antioxidant activities of the fabricated ZnO NPs were 7.8, 4.1 and 5.5% by using conventional heating, autoclave and microwave irradiation, respectively. The obtained results indicated that all the formed ZnO NPs had bactericidal effects against to the both Gram negative and Gram positive bacteria strains. However, the synthesized ZnO NPs using conventional heating method had the highest antibacterial activities toward both studied bacteria strains.

Two hydrazones derived from 1-aryl-3-(p-substituted phenyl)prop-2-en-1-one: synthesis, crystal structure, Hirshfeld surface analysis andin vitrobiological properties

2018 ◽  
Vol 74 (6) ◽  
pp. 703-714 ◽  
Author(s):  
Ouafa Dammene Debbih ◽  
Assia Sid ◽  
Rafika Bouchene ◽  
Sofiane Bouacida ◽  
Wissam Mazouz ◽  
...  
Keyword(s):  
Single Crystal ◽  
Surface Analysis ◽  
Antioxidant Activities ◽  
Hirshfeld Surface ◽  
Hirshfeld Surface Analysis ◽  
Significant Activity ◽  
X Ray Diffraction ◽  
X Ray ◽  
Ft Ir ◽  
Scavenging Efficiency

Two chalcones were synthesized by the aldolic condensation of enolizable aromatic ketones with substituted benzaldehydes under Claisen–Schmidt reaction conditions and then treated with 2,4-dinitrophenylhydrazine to yield their corresponding hydrazones. The two (E,Z)-2,4-dinitrophenylhydrazone structures, namely (Z)-1-(2,4-dinitrophenyl)-2-[(E)-3-(4-methylphenyl)-1-phenylallylidene]hydrazine, C22H18N4O4, (H1), and (Z)-1-[(E)-3-(4-chlorophenyl)-1-(naphthalen-1-yl)allylidene]-2-(2,4-dinitrophenyl)hydrazine, C25H17ClN4O4, (H2), were isolated by recrystallization and characterized by FT–IR, UV–Vis, single-crystal and powder X-ray diffraction methods. The UV–Vis spectra of the hydrazones have been studied in two organic solvents of different polarity. It was found that (H2) has a molar extinction coefficient larger than 40000. Single-crystal X-ray diffraction analysis reveals that the molecular zigzag chains of (H1) and (H2) are interconnected through noncovalent contacts. A quantitative analysis of the intermolecular interactions in the crystal structures has been performed using Hirshfeld surface analysis. All the synthesized chalcones and hydrazones were evaluated for their antibacterial and antioxidant activities. Results indicate that the studied compounds show significant activity against Gram negativeEscherichia colistrain and the chalcone 3-(4-methylphenyl)-1-phenylprop-2-en-1-one, (C1), was the most effective. In addition, only hydrazone (H1) displayed a moderate DPPH (2,2-diphenyl-1-picryl hydrazyl) scavenging efficiency.

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