scholarly journals Optimization of physicochemical parameters in the biofabrication of gold nanoparticles using marine macroalgae Padina tetrastromatica and its catalytic efficacy in the degradation of organic dyes

2018 ◽  
Vol 8 (3) ◽  
pp. 333-342 ◽  
Author(s):  
K. F. Princy ◽  
Anu Gopinath
Keyword(s):  
Gold Nanoparticles ◽  
Physicochemical Parameters ◽  
Organic Dyes ◽  
Marine Macroalgae ◽  
Padina Tetrastromatica

scholarly journals Green Synthesis of Silver and Gold Nanoparticles via Sargassum serratifolium Extract for Catalytic Reduction of Organic Dyes

Catalysts ◽  
2021 ◽  
Vol 11 (3) ◽  
pp. 347
Author(s):  
Beomjin Kim ◽  
Woo Chang Song ◽  
Sun Young Park ◽  
Geuntae Park
Keyword(s):  
Gold Nanoparticles ◽  
Green Synthesis ◽  
Catalytic Reduction ◽  
Organic Dyes ◽  
Low Cost ◽  
Inorganic Nanoparticles ◽  
X Ray ◽  
Selected Area Electron Diffraction ◽  
Transmission Electron ◽  
Sargassum Serratifolium

The green synthesis of inorganic nanoparticles (NPs) using bio-materials has attained enormous attention in recent years due to its simple, eco-friendly, low-cost and non-toxic nature. In this work, silver nanoparticles (AgNPs) and gold nanoparticles (AuNPs) were synthesized by the marine algae extract, Sargassum serratifolium (SS). The characteristic studies of bio-synthesized SS-AgNPs and SS-AuNPs were carried out by using ultraviolet–visible (UV–Vis) absorption spectroscopy, dynamic light scattering (DLS), high-resolution transmission electron microscope (HR-TEM), selected area electron diffraction (SAED), energy-dispersive X-ray spectroscopy (EDX), X-ray powder diffraction (XRD) and Fourier transform infrared spectroscopy (FT-IR). Phytochemicals in the algae extract, such as meroterpenoids, acted as a capping agent for the NPs’ growth. The synthesized Ag and Au NPs were found to have important catalytic activity for the degradation of organic dyes, including methylene blue, rhodamine B and methyl orange. The reduction of dyes by SS-AgNPs and -AuNPs followed the pseudo-first order kinetics.

Production of liquid biofuels (biodiesel and bioethanol) from brown marine macroalgae Padina tetrastromatica

2017 ◽  
Vol 135 ◽  
pp. 351-361 ◽  
Author(s):  
Veeramuthu Ashokkumar ◽  
Mohd Razman Salim ◽  
Zainal Salam ◽  
Pandian Sivakumar ◽  
Cheng Tung Chong ◽  
...  
Keyword(s):  
Marine Macroalgae ◽  
Padina Tetrastromatica

Plasmon-enhanced light absorption at organic-coated interfaces: collectivity matters

2018 ◽  
Vol 6 (6) ◽  
pp. 1413-1420 ◽  
Author(s):  
Alexandra I. Zvyagina ◽  
Alexander A. Ezhov ◽  
Ivan N. Meshkov ◽  
Vladimir K. Ivanov ◽  
Kirill P. Birin ◽  
...  
Keyword(s):  
Thin Films ◽  
Gold Nanoparticles ◽  
Optical Absorption ◽  
Intermolecular Interactions ◽  
Light Absorption ◽  
Organic Dyes

Intermolecular interactions in thin films of organic dyes control the enhancement of the optical absorption by collective plasmons of gold nanoparticles.

scholarly journals Photocatalytic Activity of Revolutionary Galaxaura elongata, Turbinaria ornata, and Enteromorpha flexuosa’s Bio-Capped Silver Nanoparticles for Industrial Wastewater Treatment

Nanomaterials ◽  
2021 ◽  
Vol 11 (12) ◽  
pp. 3241
Author(s):  
Manal N. Abdel Azeem ◽  
Safwat Hassaballa ◽  
Osama M. Ahmed ◽  
Khaled N. M. Elsayed ◽  
Mohamed Shaban
Keyword(s):  
Silver Nanoparticles ◽  
Wastewater Treatment ◽  
Organic Dyes ◽  
Exposure Period ◽  
Marine Macroalgae ◽  
Ag Nps ◽  
Turbinaria Ornata ◽  
Vis Spectroscopy ◽  
Safranine O ◽  
The Impact

More suitable wastewater treatment schemes need to be developed to get rid of harmful dyes and pigments before they are discharged, primarily from apparel and textile factories, into water bodies. Silver nanoparticles (Ag-NPs) are very effective, reductive nanocatalysts that can degrade many organic dyes. In this study, Ag-NPs are stabilized and capped with bioactive compounds such as Galaxaura elongata, Turbinaria ornata, and Enteromorpha flexuosa from marine macroalgae extracts to produce Ag[GE], Ag[TE], and Ag[EE] NPs. The reduction of Ag ions and the production of Ag[GE], Ag[TE], and Ag[EE] NPs have been substantiated by UV–Vis spectroscopy, SEM, EDX, and XRD tests. The NPs are sphere and crystalline shaped in nature with dimensions ranging from 20 to 25 nm. The biosynthesized Ag[GE], Ag[TE], Ag[EE] NPs were applied to photodegrade hazardous pigments such as methylene blue, Congo red, safranine O, and crystal violet under sunlight irradiation. In addition to the stability analysis, various experimental parameters, including dye concentration, exposure period, photocatalyst dose, and temperature, were optimized to achieve 100% photodegradation of the dyes. Moreover, the thermodynamic and kinetic parameters were calculated and the impact of scavengers on the photocatalytic mechanism was also investigated.

scholarly journals Persea americana seed extract mediated gold nanoparticles for mercury(ii)/iron(iii) sensing, 4-nitrophenol reduction, and organic dye degradation

RSC Advances ◽  
2019 ◽  
Vol 9 (68) ◽  
pp. 39834-39842 ◽  
Author(s):  
Naveen Kumar Reddy Bogireddy ◽  
Vivechana Agarwal
Keyword(s):  
Gold Nanoparticles ◽  
Organic Dyes ◽  
Dye Degradation ◽  
Catalytic Efficiency ◽  
Seed Extract ◽  
Persea Americana ◽  
Nitrophenol Reduction ◽  
Highly Sensitive ◽  
Organic Dye Degradation ◽  
Highly Sensitive Detection

Gold nanoparticles for highly sensitive detection of Hg(ii)/Fe(iii) and catalytic efficiency towards the reduction/degradation of 4-nitrophenol and organic dyes.

Gold nanoparticles and organic dyes for BIPV-DSSCs

2015 ◽  
Author(s):  
M. Mazzoni ◽  
F. Ratto ◽  
A. Mordini ◽  
A. Ienco ◽  
L. Zani ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Organic Dyes

scholarly journals Selective Oxidation of Transient Organic Radicals in the Presence of Gold Nanoparticles

Nanomaterials ◽  
2021 ◽  
Vol 11 (3) ◽  
pp. 727
Author(s):  
Viacheslav Shcherbakov ◽  
Sergey A. Denisov ◽  
Mehran Mostafavi
Keyword(s):  
Gold Nanoparticles ◽  
Catalytic Activity ◽  
Selective Oxidation ◽  
Room Temperature ◽  
Catalytic Effect ◽  
Organic Dyes ◽  
Organic Radicals ◽  
Species Concentration ◽  
Reactive Oxygen Species Concentration

The ability of gold nanoparticles (AuNPs) to catalyze reactions involving radicals is poorly studied. However, AuNPs are used in applications where chemical reactions involving transient radicals occur. Herein, we investigate AuNPs’ catalytic effect on 2-propanol oxidation and acetanilide hydroxylation in aqueous solutions under ionizing radiation at room temperature. In both cases, the presence of AuNPs led to selective oxidation of organic radicals, significantly changing the products’ composition and ratio. Based on these observations, we stress how AuNPs’ catalytic activity can affect the correctness of reactive oxygen species concentration determination utilizing organic dyes. We also provide a discussion on the role of AuNPs’ catalytic activity in the radiosensitization effect actively studied for radiotherapy.

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