scholarly journals Process Optimization of Silver Nanoparticle Synthesis and Its Application in Mercury Detection

Micromachines ◽  
2021 ◽  
Vol 12 (9) ◽  
pp. 1123
Author(s):  
Lung-Ming Fu ◽  
Jia-Hong Hsu ◽  
Ming-Kuei Shih ◽  
Chang-Wei Hsieh ◽  
Wei-Jhong Ju ◽  
...  
Keyword(s):  
Nanoparticle Synthesis ◽  
Trisodium Citrate ◽  
Hot Water ◽  
Color Intensity ◽  
Biochemical Engineering ◽  
Absorption Properties ◽  
Mercury Detection ◽  
Reaction Optimization ◽  
Simple Detection ◽  
Silver Nanoparticle Synthesis

Silver nanoparticles (AgNPs) have stable reactivity and excellent optical absorption properties. They can be applied in various industries, such as environmental protection, biochemical engineering, and analyte monitoring. However, synthesizing AgNPs and determining their appropriate dosage as a coloring substance are difficult tasks. In this study, to optimize the process of AgNP synthesis and obtain a simple detection method for trace mercury in the environment, we evaluate several factors—including the reagent addition sequence, reaction temperature, reaction time, the pH of the solution, and reagent concentration—considering the color intensity and purity of AgNPs as the reaction optimization criteria. The optimal process for AgNP synthesis is as follows: Mix 10 mM of silver nitrate with trisodium citrate in a hot water bath for 10 min; then, add 10 mM of sodium borohydride to produce the AgNPs and keep stirring for 2 h; finally, adjust the pH to 12 to obtain the most stable products. For AgNP-based mercury detection, the calibration curve of mercury over the concentration range of 0.1–2 ppb exhibits good linearity (R2 > 0.99). This study provides a stable and excellent AgNP synthesis technique that can improve various applications involving AgNP-mediated reactions and has the potential to be developed as an alternative to using expensive detection equipment and to be applied for the detection of mercury in food.

scholarly journals A REVIEW: A GREEN APPROACH FOR THE SYNTHESIS OF SILVER NANOPARTICLES AND ITS ANTIBACTERIAL APPLICATIONS

2018 ◽  
Vol 11 (8) ◽  
pp. 74 ◽  
Author(s):  
Shyla Marjorie Haqq ◽  
Amit Chattree
Keyword(s):  
Silver Nanoparticles ◽  
Antimicrobial Properties ◽  
Nanoparticle Synthesis ◽  
Silver Ions ◽  
Multidrug Resistant ◽  
X Ray Diffraction ◽  
Green Approach ◽  
Transmission Electron ◽  
Uv Visible ◽  
Silver Nanoparticle Synthesis

  This review is based on the synthesis of silver nanoparticles (AgNPs) using a green approach which is biofabricated from various medicinal plants. AgNPs were prepared from the various parts of the plants such as the flowers, stems, leaves, and fruits. Various physiochemical characterizations were performed using the ultraviolet (UV)-visible spectroscopy, Fourier transform infrared spectroscopy, X-ray diffraction spectroscopy, transmission electron microscopy, and energy dispersive spectroscopy. AgNPs were also used to inhibit the growth of bacterial pathogens and were found to be effective against both the Gram-positive and Gram-negative bacteria. For the silver to have antimicrobial properties, it must be present in the ionized form. All the forms of silver-containing compounds with the observed antimicrobial properties are in one way or another source of silver ions. Although the antimicrobial properties of silver have been known, it is thought that the silver atoms bind to the thiol groups in enzymes and subsequently leads to the deactivation of enzymes. For the silver to have antimicrobial properties, it must be present in the ionized form. The study suggested that the action of the AgNPs on the microbial cells resulted into cell lysis and DNA damage. AgNPs have proved their candidature as a potential antibacterial against the multidrug-resistant microbes. The biological agents for synthesizing AgNPs cover compounds produced naturally in microbes and plants. Reaction parameters under which the AgNPs were being synthesized hold prominent impact on their size, shape, and application. Silver nanoparticle synthesis and their application are summarized and critically discussed in this review.

Vigna mungo Seed Non-Destructive Based Colloidal Silver Nanoparticle Synthesis and Toxicity

2016 ◽  
Vol 3 (2) ◽  
pp. 119-126
Author(s):  
Jyoti Prasad Saikia ◽  
◽  
Bably Khatun ◽  
Bhaskarjyoti Gogoi ◽  
Alak Kumar Buragohain ◽  
...  
Keyword(s):  
Silver Nanoparticle ◽  
Nanoparticle Synthesis ◽  
Vigna Mungo ◽  
Colloidal Silver ◽  
Non Destructive ◽  
Silver Nanoparticle Synthesis

Does Nitrate Reductase Play a Role in Silver Nanoparticle Synthesis? Evidence for NADPH as the Sole Reducing Agent

2019 ◽  
Vol 7 (9) ◽  
pp. 8070-8076 ◽  
Author(s):  
Sebastian Hietzschold ◽  
Andrew Walter ◽  
Connor Davis ◽  
Aidan A. Taylor ◽  
Lior Sepunaru
Keyword(s):  
Nitrate Reductase ◽  
Silver Nanoparticle ◽  
Nanoparticle Synthesis ◽  
Reducing Agent ◽  
Silver Nanoparticle Synthesis

scholarly journals Slight pH Fluctuations in the Gold Nanoparticle Synthesis Process Influence the Performance of the Citrate Reduction Method

Sensors ◽  
2018 ◽  
Vol 18 (7) ◽  
pp. 2246 ◽  
Author(s):  
Braulio Contreras-Trigo ◽  
Víctor Díaz-García ◽  
Enrique Guzmán-Gutierrez ◽  
Ignacio Sanhueza ◽  
Pablo Coelho ◽  
...  
Keyword(s):  
Large Scale ◽  
Colloidal Suspension ◽  
Nanoparticle Synthesis ◽  
Trisodium Citrate ◽  
Gold Surface ◽  
Point Of View ◽  
Synthesis Process ◽  
Reaction Yield ◽  
Size Dependent ◽  
Gold Nanoparticle Synthesis

Gold nanoparticles (AuNPs) are currently under intense investigation for biomedical and biotechnology applications, thanks to their ease in preparation, stability, biocompatibility, multiple surface functionalities, and size-dependent optical properties. The most commonly used method for AuNP synthesis in aqueous solution is the reduction of tetrachloroauric acid (HAuCl4) with trisodium citrate. We have observed variations in the pH and in the concentration of the gold colloidal suspension synthesized under standard conditions, verifying a reduction in the reaction yield by around 46% from pH 5.3 (2.4 nM) to pH 4.7 (1.29 nM). Citrate-capped AuNPs were characterized by UV-visible spectroscopy, TEM, EDS, and zeta-potential measurements, revealing a linear correlation between pH and the concentration of the generated AuNPs. This result can be attributed to the adverse effect of protons both on citrate oxidation and on citrate adsorption onto the gold surface, which is required to form the stabilization layer. Overall, this study provides insight into the effect of the pH over the synthesis performance of the method, which would be of particular interest from the point of view of large-scale manufacturing processes.

Sign in / Sign up

Export Citation Format

Share Document