scholarly journals PEMBUATAN NANOPARTIKEL PERAK (NPP) DENGAN BIOREDUKTOR EKSTRAK BUAH Muntingia calabura L UNTUK ANALISIS LOGAM MERKURI

Alotrop ◽  
2017 ◽  
Vol 1 (1) ◽  
Author(s):  
Purwo Ismaya Sari ◽  
M. Lutfi Firdaus ◽  
Rina Elvia
Keyword(s):  
Silver Nanoparticles ◽  
Digital Image ◽  
Contact Time ◽  
Volume Ratio ◽  
Reduction Reaction ◽  
Image Method ◽  
Metal Analysis ◽  
Fruit Extract ◽  
Agno3 Solution ◽  
Muntingia Calabura

The goal of this research was to make silver nanoparticles (NPP) with a cherry fruit extract bioreductor which was used for mercury metal analysis by using a digital image method. The process of making silver nanoparticles had done by a bottom up method involving a reduction reaction. The precursors used were 1 mM AgNO3 solution and as a bioreductor was an antioxidant compound which were in cherry fruit extract. Variation of the volume ratio between cherry fruit extract and 1 mM AgNO3 solution was 1: 3, 1: 4, 1: 5, 1: 6, and 1: 7 and the variation of contact time were 5, 15, 30, 45, 1, 2, 3 hours, and 1, 2, 7 days. The most optimum results of silver nanoparticles were synthesized with 1 : 4 volume ratio and 1 hour contact time. From the results of selectivity test, it was known that silver nanoparticles were made selective toward Hg and Fe metal. The sensitivity test toward Hg metal, it was known that NPP can detect mercury metal with the smallest concentration of 16,7  ppb.

scholarly journals UPAYA PENINGKATAN SENSITIVITAS NANOPARTIKEL PERAK UNTUK ANALISIS ION MERKURI(II) SECARA CITRA DIGITAL DENGAN PENAMBAHAN NaCl

Alotrop ◽  
2019 ◽  
Vol 3 (2) ◽  
Author(s):  
Edo Prasetia ◽  
M. Lutfi Firdaus ◽  
Elvinawati Elvinawati
Keyword(s):  
Silver Nanoparticles ◽  
Concentration Level ◽  
Limit Of Detection ◽  
Reduction Reaction ◽  
Small Concentration ◽  
Image Method ◽  
Capsicum Frutescens ◽  
Agno3 Solution ◽  
Sensitive Method ◽  
Colorimetric Sensors

The very small concentration of mercury (Hg) in the environment is difficult to detect, so an accurate and sensitive method is needed in order to detect the concentration. Therefore, the purpose of this study was to develop an accurate and sensitive method based on the use of digital imaging methods and silver nanoparticles (AgNPs) as colorimetric sensors for mercury(II) ions (Hg2+) analysis. The process of making AgNPS is done by a bottom up method involving a reduction reaction. The precursor used is 1 mM AgNO3 solution and as bioreductor is an antioxidant compound present in extract of chili pepper (Capsicum frutescens L) with ratio 1: 9. Contact time variation 15, 30, 45, 60 min and 1, 2, 7 days. Addition of NaCl 0.5 and 1 M NaCl were used to increase the sensitivity of AgNPs as colorimetric sensors of Hg2+ ions. Digital Image Method is used to analyze Hg2+ ions at ppb concentration level. The results of the most optimum silver nanoparticles synthesized at the time of solar heating is 60 minutes. The addition of NaCl 0.5 M and 1 M into AgNPs is able to increase the sensitivity of AgNPs. Limit of Detection (LoD) of AgNPs added NaCl 0.5 M and 1 M was able to detect Hg2 + ions by 3.02 ppb and 2.46ppb.

scholarly journals Fortunella japonica extract as a reducing agent for green synthesis of silver nanoparticles

2018 ◽  
Vol 7 (3) ◽  
pp. 1570
Author(s):  
Nguyen Phung Anh ◽  
Truong Thi Ai Mi ◽  
Duong Huynh Thanh Linh ◽  
Nguyen Thi Thuy Van ◽  
Hoang Tien Cuong ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Silver Nanoparticles ◽  
Antibacterial Activity ◽  
Volume Ratio ◽  
Diffusion Method ◽  
High Antibacterial Activity ◽  
Agno3 Solution ◽  
Transmission Electron ◽  
Vis Spectroscopy ◽  
Average Size

A rapid way of synthesizing silver nanoparticles (AgNPs) by treating Ag+ ions with a green Fortunella Japonica (F.J.) extract as a combined reducing and stabilizing agent was investigated. The reaction solutions were monitored using UV-Vis spectroscopy, the size and shape of crystals were determined by scanning electron microscopy and transmission electron microscopy, the crystalline phases of AgNPs were presented by X–ray diffraction, and the relation of nanoparticles with Fortunella Japonica extract was confirmed using fourier transform infrared spectroscopy. The results indicated that no formation of AgNPs had taken place in the dark during 24 hours at room temperature and 40 oC. Meanwhile, it was found that the rate of AgNPs formation increased rapidly under the sunlight. The effects of the synthesis factors on the AgNPs formation were investigated. The suitable conditions for the synthesis of AgNPs using F.J. extract were determined as follows: F.J. extract was mixed with AgNO3 1.75 mM solution with the volume ratio of 3.5 AgNO3 solution/1.5 F.J. Extract, stirred 300 rpm for 150 minutes at 40 oC under sunlight illumination. At these conditions, AgNPs showed high crystalline structure with the average size of 15.9 nm. The antibacterial activity of silver nanoparticles was determined by agar well diffusion method against E. coli and B. subtilis bacteria. The green synthesized AgNPs performed high antibacterial activity against both bacteria.  

Bacterial Cellulose as a Template for the Formation of Polymer/Nanoparticle Nanocomposite

2011 ◽  
Vol 2 (3) ◽  
Author(s):  
Cai Zhijiang ◽  
Hou Chengwei ◽  
Yang Guang ◽  
Kim Jaehwan
Keyword(s):  
Silver Nanoparticles ◽  
Bacterial Cellulose ◽  
Weight Percent ◽  
Preparation Condition ◽  
Reduction Reaction ◽  
X Ray Diffraction ◽  
X Ray ◽  
Agno3 Solution ◽  
Silver Nanocomposites ◽  
Average Size

In this paper, we investigate a novel method using bacterial cellulose (BC) as template by in situ method to prepare BC/silver nanocomposites. We first introduce sonication procedure during immersion and reduction reaction process to make sure that the silver nanoparticles can be formed and distributed homogeneously throughout the whole bacterial cellulose network. The BC/silver nanocomposites were confirmed by scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDX), X-ray diffraction (XRD), and thermogravimetric analysis (TGA). To examine the effect of varying solution concentrations on silver nanoparticles formation, the concentration of AgNO3 solution was increased from 0.01 M to 0.05 M and Ag+-ions were reduced by the same concentration of NaBH4. The effects of time and frequency of sonication on BC/silver nanocomposite preparation were also investigated by varying sonication time from 10 min to 60 min and sonication frequency from 20 kHz to 60 kHz. Compared with an ordinary process, ultrasound seems to be an effective way for ions to penetrate into BC and thus the weight percent of silver nanoparticles can be increased. Combined with TGA result, the weight percent of silver nanoparticles can be improved from 8.9% to 31.7% with simple sonication procedure performed by the same preparation condition. However, the average size of silver nanoparticles is around 15 nm, which is bigger than ordinary process. This may be due to the aggregation of small nanoparticles, especially at high AgNO3 concentration.

scholarly journals Synthesis and Characterization of Silver Nanoparticles Prepared with Carrasquilla Fruit Extract (Berberis hallii) and Evaluation of Its Photocatalytic Activity

Catalysts ◽  
2021 ◽  
Vol 11 (10) ◽  
pp. 1195
Author(s):  
Geovanna Arroyo ◽  
Yolanda Angulo ◽  
Alexis Debut ◽  
Luis Heriberto Cumbal
Keyword(s):  
Silver Nanoparticles ◽  
Photocatalytic Activity ◽  
Silver Ions ◽  
Industrial Processes ◽  
Metallic Elements ◽  
Fruit Extract ◽  
Agno3 Solution ◽  
Solar Light Irradiation ◽  
Thiazine Ring

In this study, silver nanoparticles (AgNPs) were obtained using a green-chemistry procedure. For this protocol, the Carrasquilla extract (CE) (Berberis hallii) and a AgNO3 solution were used as the reducing agent and the metal precursor, respectively. The as-prepared AgNPs after characterization were then used to evaluate the degradation of the methylene blue (MB), the safranin (SF), and the mixture of both dyes in the aqueous phase under solar light irradiation. The photocatalytic activity of AgNPs for the degradation of the MB (k = 0.0092 min−1) was higher than the SF (k = 0.00016 min−1) due to the susceptibility of the thiazine ring of the MB to photodegradation contrasted to the phenyl phenazine of the SF. However, SF was mostly removed by adsorption with a maximum uptake of 2907 mg/g. Overall, this eco-friendly and green conversion of silver ions to metallic elements avoids the use of toxic chemicals and could be applied for the degradation/adsorption of dyes used in several industrial processes.

Testing of photocatalytic potential of silver nanoparticles produced through nonthermal plasma reduction reaction and stabilized with saccharides

2021 ◽  
pp. 1-14
Author(s):  
N.U.H. Altaf ◽  
M.Y. Naz ◽  
S. Shukrullah ◽  
H.N. Bhatti
Keyword(s):  
Silver Nanoparticles ◽  
Band Gap ◽  
Light Exposure ◽  
Argon Plasma ◽  
Silver Ions ◽  
Reduction Reaction ◽  
Diameter Distribution ◽  
Light Spectrum ◽  
Plasma Reduction ◽  
Narrow Diameter Distribution

In this study, silver nanoparticles (AgNPs) were produced through an atmospheric pressure plasma reduction reaction and tested for photodegradation of methyl blue (MB) under sunlight exposure. The argon plasma born reactive species were used to reduce silver ions to AgNPs in the solution. Glucose, fructose and sucrose were also added in the solution to stabilize the growth process. The glucose stabilized reaction produced the smallest nanoparticles of 12 nm, while sucrose stabilized reaction produced relatively larger nanoparticles (14 nm). The nanoparticles exhibited rough morphology and narrow diameter distribution regardless of stabilizer type. The narrow diameter distribution and small band gap helped activating majority of nanoparticles at a single wavelength of light spectrum. The band gap energy of AgNPs varied from 2.22 eV to 2.41 eV, depending on the saccharide type. The photoluminescence spectroscopy of AgNPs produced emission peaks at 413 nm, 415 nm, and 418 nm. The photocatalytic potential of AgNP samples was checked by degrading MB dye under sunlight. The degradation reaction reached a saturation level of 98% after 60 min of light exposure.

scholarly journals Green synthesis of silver nanoparticles by using carambola fruit extract and their antibacterial activity

2015 ◽  
Vol 6 (4) ◽  
pp. 045015 ◽  
Author(s):  
S J Mane Gavade ◽  
G H Nikam ◽  
R S Dhabbe ◽  
S R Sabale ◽  
B V Tamhankar ◽  
...  
Keyword(s):  
Silver Nanoparticles ◽  
Antibacterial Activity ◽  
Green Synthesis ◽  
Fruit Extract

scholarly journals Green synthesis of antimicrobial silver nanoparticles using fruit extract of Glycosmis pentaphylla and its theoretical explanations

2022 ◽  
Vol 1247 ◽  
pp. 131361
Author(s):  
Tanmoy Dutta ◽  
Swapan Kumar Chowdhury ◽  
Narendra Nath Ghosh ◽  
Asoke P. Chattopadhyay ◽  
Mahuya Das ◽  
...  
Keyword(s):  
Silver Nanoparticles ◽  
Green Synthesis ◽  
Fruit Extract

Plant-mediated green synthesis and characterization of silver nanoparticles using Phyllanthus emblica fruit extract

2021 ◽  
Author(s):  
Sajib Aninda Dhar ◽  
Rashedul Alam Chowdhury ◽  
Shaon Das ◽  
Md. Khalid Nahian ◽  
Dipa Islam ◽  
...  
Keyword(s):  
Silver Nanoparticles ◽  
Green Synthesis ◽  
Synthesis And Characterization ◽  
Phyllanthus Emblica ◽  
Fruit Extract

Optimization and Characterization of Biogenic Silver Nanoparticles Synthesized by Leaves Extract of Alphonsea Madraspatana

2021 ◽  
Vol 17 ◽  
Author(s):  
Amita Sahu ◽  
Sudhanshu Shekhar Swain ◽  
Goutam Ghosh ◽  
Deepak Pradhan ◽  
Dipak Kumar Sahu ◽  
...  
Keyword(s):  
Silver Nanoparticles ◽  
Volume Ratio ◽  
Xrd Analysis ◽  
Biofilm Inhibition ◽  
Nano Silver ◽  
E Coli ◽  
Biogenic Silver Nanoparticles ◽  
Icp Ms ◽  
Anti Oxidant

Background: Literature evidences as well as traditional uses of genus Alphonsea reveal significant antimicrobial and anti-oxidant activity, which encourages to consider A. madraspatana to have potent antimicrobials, there by offering potential adjuncts to synthesize improved antimicrobial Silver nanoparticles (AgNPs). The objective of the present exposition is to optimize reaction parameters to synthesize antimicrobial Biogenic Silver nanoparticles (BAgNPs) from extract of A. madraspatana leaves (AML) and to evaluate the effect against bacteria. Methods: BAgNPs was synthesized by optimized reaction. The Synthesized nanoparticles were characterized by UV, IR, ICP-MS and XRD analysis. The antibacterial potency of optimized BAgNPs was evaluated against E. coli by comparing with positive controls. Results: Results of optimization process indicate nanoscale BAgNPs were produced at operating temp. of 45°C for 120 min at pH 8 with 1:5 volume ratio of AgNO3 and extract. Optimized BAgNPs exhibits relatively higher antimicrobial activity (31±1mm) compared to Ciprofloxacin (27±1mm) and marketed nano silver (28± 2 mm). The developed BAgNPs shows comparable biofilm inhibition (86.50%) as compared to marketed nano silver (88.10%) and Ciprofloxacin (83.10%). Conclusion: Experimental evidence suggests methanolic extract of AML under predefined conditions successfully generate nano-template of silver with better antibacterial response against E. coli.

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