Homogeneous catalytic activity of gold nanoparticles synthesized using turnip (Brassica rapa L.) leaf extract in the reductive degradation of cationic azo dye

2015 ◽  
Vol 32 (7) ◽  
pp. 1273-1277 ◽  
Author(s):  
Kannan Badri Narayanan ◽  
Hyun Ho Park
Keyword(s):  
Gold Nanoparticles ◽  
Catalytic Activity ◽  
Brassica Rapa ◽  
Azo Dye ◽  
Leaf Extract ◽  
Reductive Degradation

scholarly journals Green Method for Synthesis of Gold Nanoparticles Using Polyscias scutellaria Leaf Extract under UV Light and Their Catalytic Activity to Reduce Methylene Blue

2017 ◽  
Vol 2017 ◽  
pp. 1-6 ◽  
Author(s):  
Yoki Yulizar ◽  
Tresye Utari ◽  
Harits Atika Ariyanta ◽  
Digha Maulina
Keyword(s):  
Methylene Blue ◽  
Gold Nanoparticles ◽  
Catalytic Activity ◽  
Leaf Extract ◽  
Uv Light ◽  
Reduction Rate ◽  
Hydroxyl Groups ◽  
Face Centered Cubic ◽  
Pseudo First Order Reaction ◽  
Aqueous Fraction

The aqueous fraction of Polyscias scutellaria leaf extract (PSE) has been used as a reducing agent and stabilizer in the green synthesis of gold nanoparticles (AuNPs). UV-Vis spectrophotometry, particle size analyzer (PSA), Fourier transform infrared (FTIR) spectroscopy, transmission electron microscopy-selected area electron diffraction (TEM-SAED), and X-ray diffraction (XRD) were used to characterize AuNPs. The AuNPs have a size of 5–20 nm and have a face centered cubic (fcc) crystal structure and are stable for 21 days. Phenolic compounds, which are secondary metabolites of PSE, act as an active compound to reduce Au3+ ion to Au0, as well as stabilize the AuNPs through their surface interaction with carbonyl and hydroxyl groups of phenols. AuNPs exhibit excellent catalytic activity for the reduction of methylene blue with NaBH4. The reduction of methylene blue using AuNPs catalysts is a pseudo-first-order reaction with a reduction rate constant (kobs) of 0.0223 min−1.

scholarly journals Silver and Gold Nanoparticles from Limnophila rugosa Leaves: Biosynthesis, Characterization, and Catalytic Activity in Reduction of Nitrophenols

2021 ◽  
Vol 2021 ◽  
pp. 1-11
Author(s):  
Van Thuan Le ◽  
Ngoc Nhu Quynh Ngu ◽  
Tan Phat Chau ◽  
Thi Dung Nguyen ◽  
Van Toan Nguyen ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Gold Nanoparticles ◽  
Catalytic Activity ◽  
Metal Nanoparticles ◽  
Leaf Extract ◽  
Noble Metal Nanoparticles ◽  
Metallic Ions ◽  
Ftir Microscopy ◽  
X Ray ◽  
Silver And Gold Nanoparticles

This study describes a simple green method for the synthesis of Limnophila rugosa leaf-extract-capped silver and gold nanoparticles without using any expensive toxic reductant or stabilizer. The noble metal nanoparticles were characterized by Fourier transform infrared (FTIR) microscopy, powder X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM), energy-dispersive X-ray analysis (EDX), high-resolution transmission electron microscopy (HR-TEM), selected area electron diffraction (SAED), and dynamic light scattering (DLS) method. It has been found that the biosynthesized silver and gold nanoparticles are nearly spherical in shape with a mean particle size distribution of 87.5 nm and 122.8 nm, respectively. XRD and SAED patterns confirmed the crystalline nanostructure of the metal nanoparticles. FTIR spectra revealed the functional groups of biomolecules presented in the extract possibly responsible for reducing metallic ions and stabilizing formed nanoparticles. The biosynthesized metal nanoparticles have potential application in catalysis. Compared to previous reports, Limnophila rugosa leaf-extract-capped silver and gold nanoparticles exhibited a good catalytic activity in the reduction of several derivatives of nitrophenols including 1,4-dinitrobenzene, 2-nitrophenol, 3-nitrophenol, and 4-nitrophenol.

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.

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