scholarly journals A biomimetic synthesis of stable gold nanoparticles derived from aqueous extract of Foeniculum vulgare seeds and evaluation of their catalytic activity

2017 ◽  
Vol 7 (7) ◽  
pp. 439-447 ◽  
Author(s):  
Manoj Kumar Choudhary ◽  
Jyoti Kataria ◽  
Shweta Sharma
Keyword(s):  
Gold Nanoparticles ◽  
Catalytic Activity ◽  
Aqueous Extract ◽  
Biomimetic Synthesis ◽  
Foeniculum Vulgare

Strong Promoting Effect of Gold Nanoparticles on the CO Abatement Catalytic Activity of CoO x /Clay‐Bonded SiC Catalysts Produced by AA‐MOCVD Method Using Co(acac) 2 as Precursor

2020 ◽  
Vol 5 (44) ◽  
pp. 13878-13887
Author(s):  
Golnoosh MirMoghtadaei ◽  
Manoj K. Ghosalya ◽  
Luca Artiglia ◽  
Jeroen A. Bokhoven ◽  
Cavus Falamaki
Keyword(s):  
Gold Nanoparticles ◽  
Catalytic Activity ◽  
Promoting Effect

scholarly journals Catalytic Activity of Beta-Cyclodextrin-Gold Nanoparticles Network in Hydrogen Evolution Reaction

Catalysts ◽  
2021 ◽  
Vol 11 (1) ◽  
pp. 118
Author(s):  
Qui Quach ◽  
Erik Biehler ◽  
Ahmed Elzamzami ◽  
Clay Huff ◽  
Julia M. Long ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Catalytic Activity ◽  
Gold Catalyst ◽  
Hydrogen Gas ◽  
Hydrolysis Reaction ◽  
X Ray Diffraction ◽  
Beta Cyclodextrin ◽  
Transmission Electron ◽  
Production Of Hydrogen ◽  
Climate Crisis

The current climate crisis warrants investigation into alternative fuel sources. The hydrolysis reaction of an aqueous hydride precursor, and the subsequent production of hydrogen gas, prove to be a viable option. A network of beta-cyclodextrin capped gold nanoparticles (BCD-AuNP) was synthesized and subsequently characterized by Powder X-Ray Diffraction (P-XRD), Fourier Transform Infrared (FTIR), Transmission Electron Microscopy (TEM), and Ultraviolet-Visible Spectroscopy (UV-VIS) to confirm the presence of gold nanoparticles as well as their size of approximately 8 nm. The catalytic activity of the nanoparticles was tested in the hydrolysis reaction of sodium borohydride. The gold catalyst performed best at 303 K producing 1.377 mL min−1 mLcat−1 of hydrogen. The activation energy of the catalyst was calculated to be 54.7 kJ/mol. The catalyst resisted degradation in reusability trials, continuing to produce hydrogen gas in up to five trials.

scholarly journals Influence of Co-Precipitation Agent on the Structure, Texture and Catalytic Activity of Au-CeO2 Catalysts in Low-Temperature Oxidation of Benzyl Alcohol

Catalysts ◽  
2021 ◽  
Vol 11 (5) ◽  
pp. 641
Author(s):  
Lukasz Wolski ◽  
Grzegorz Nowaczyk ◽  
Stefan Jurga ◽  
Maria Ziolek
Keyword(s):  
Gold Nanoparticles ◽  
Catalytic Activity ◽  
Low Temperature ◽  
Benzyl Alcohol ◽  
Low Temperature Oxidation ◽  
Temperature Oxidation ◽  
Oxidation Of Benzyl Alcohol ◽  
Key Factor ◽  
Au Particle Size ◽  
Co Precipitation

The aim of the study was to establish the influence of a co-precipitation agent (i.e., NaOH–immediate precipitation; hexamethylenetetramine/urea–gradual precipitation and growth of nanostructures) on the properties and catalytic activity of as-synthesized Au-CeO2 nanocomposites. All catalysts were fully characterized with the use of XRD, nitrogen physisorption, ICP-OES, SEM, HR-TEM, UV-vis, XPS, and tested in low-temperature oxidation of benzyl alcohol as a model oxidation reaction. The results obtained in this study indicated that the type of co-precipitation agent has a significant impact on the growth of gold species. Immediate co-precipitation of Au-CeO2 nanostructures with the use of NaOH allowed obtainment of considerably smaller and more homogeneous in size gold nanoparticles than those formed by gradual co-precipitation and growth of Au-CeO2 nanostructures in the presence of hexamethylenetetramine or urea. In the catalytic tests, it was established that the key factor promoting high activity in low-temperature oxidation of benzyl alcohol was size of gold nanoparticles. The highest conversion of the alcohol was observed for the catalyst containing the smallest Au particle size (i.e., Au-CeO2 nanocomposite prepared with the use of NaOH as a co-precipitation agent).

scholarly journals Catalytic activity of gold nanoparticles deposited on N-doped carbon-based supports in oxidation of glucose and arabinose mixtures

2021 ◽  
Author(s):  
Sebastian Franz ◽  
Nataliya D. Shcherban ◽  
Igor Bezverkhyy ◽  
Sergii A. Sergiienko ◽  
Irina L. Simakova ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Catalytic Activity ◽  
Glucose Oxidation ◽  
Glucuronic Acid ◽  
Carbon Surface ◽  
Carbon Supports ◽  
Constant Ph ◽  
Oxidation Of Glucose ◽  
Mesoporous Structures ◽  
Carbon Based

AbstractOxidation of a mixture of glucose and arabinose over Au particles deposited on porous carbons, N-doped carbons and carbon nitrides was investigated at 70 °C, under constant pH of 8, and oxygen partial pressure 0.125 atm. In particular, Au deposited on nitrogen-containing carbon-based mesoporous structures demonstrated activity in the oxidation of the sugars to the corresponding aldonic acids higher than gold deposited on undoped carbon supports (conversion of glucose up to ca. 60%, arabinose–ca. 30% after 200 min). The results can be explained by the basic nature of the supports leading to an increase in the polarity of the carbon surface and the oxygen activation. Glucuronic acid (with selectivity ca. 10–93.5%) together with gluconic acid was formed as a result of glucose oxidation, while arabinose was selectively oxidized to arabinonic acid.

Catalytic Activity of Gold Nanoparticles Incorporated into Modified Zeolites

2007 ◽  
Vol 7 (6) ◽  
pp. 1882-1886 ◽  
Author(s):  
E. Smolentseva ◽  
N. Bogdanchikova ◽  
A. Simakov ◽  
A. Pestryakov ◽  
M. Avalos ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Catalytic Activity ◽  
Modified Zeolites

scholarly journals Green Synthesis of Gold Nanoparticles from Leaf Extracts of Ginkgo biloba L. and its Antibiotic Potential Against Escherichia coli and Bacillus subtilis

2020 ◽  
Vol 2 (1) ◽  
pp. 29
Keyword(s):  
Gold Nanoparticles ◽  
Bacillus Subtilis ◽  
Aqueous Extract ◽  
Ginkgo Biloba ◽  
Bacterial Pathogens ◽  
Sem Analysis ◽  
Leaf Extracts ◽  
Living Fossil ◽  
E Coli ◽  
Global Environmental

Based on the global environmental pollution problems, the main focus of every nano-research is to produce the nanomaterial in a green and eco-friendly way without any interference of chemical synthesis. By the way, the present study was intended to use an aqueous extract of the living fossil plant viz., Ginkgo biloba L., to synthesize the gold nanoparticles and evaluate their antibiotic activity against bacterial pathogens. The gold nanoparticles (AuNps) were successfully synthesized by mixing the Ginkgo biloba aqueous extract and the auric chloride solution for approximately 24 hours. The UV-Vis spectra of Gold nanoparticles (AuNps) showed the maximum absorption peak at 520nm. The SEM analysis also showed the gold nanoparticles synthesized from Ginkgo biloba were spherical with particle size ranging from 40 to 60nm. During our study, the gold nanoparticles exhibited significant antimicrobial activity against bacterial pathogens, i.e., E. coli and Bacillus subtilis. The later bacterium was found to be more susceptible to the nanoparticles as well as the extracts of G. biloba in comparison to the former bacterium.

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