A step ahead towards the green synthesis of monodisperse gold nanoparticles: the use of crude glycerol as a greener and low-cost reducing agent

RSC Advances ◽  
2016 ◽  
Vol 6 (97) ◽  
pp. 95210-95219 ◽  
Author(s):  
Rashida Parveen ◽  
Germano Tremiliosi-Filho

Crude glycerol obtained directly from transesterification reaction was employed as a low-cost and greener reducing agent to prepare monodisperse AuNPs (∼8 nm).

Nativa ◽  
2019 ◽  
Vol 7 (3) ◽  
pp. 268
Author(s):  
Pedro Henrique da Conceição Silva ◽  
Anselmo Fortunato Ruiz Rodriguez

Tradicionalmente as técnicas de síntese de nanopartículas utilizam solventes tóxicos, o que gera resíduos potencialmente nocivos tanto à saúde quanto ao meio ambiente. Buscando metodologias mais sustentáveis na síntese de nanopartículas várias pesquisas têm proposto a utilização de agentes biológicos ou parte deles, em substituição aos reagentes químicos tóxicos. Assim, este trabalho propôs sintetizar nanopartículas de ouro, utilizando síntese verde, ou seja, o látex da planta Sangue de Dragão (Croton lechleri Müll. Arg.) como agente redutor. A planta Sangue de Dragão é nativa dos países Peru e Bolívia, no Brasil ela é encontrada na região Norte, nos estados Rondônia, Acre e Amazonas. Para realizar a síntese de nanopartículas, em busca de condições de síntese e de aperfeiçoamento de parâmetros, utilizou-se a técnica de visão de nanopartículas em suspensão coloidal e estabilidade, com monodispersividade. Obtendo-se monodispersidade das nanopartículas de ouro, sendo formadas nanopartículas que se encontram no diâmetro entre 10 nm e 40 nm. O potencial zeta esteve na faixa de da região de +/- 30 mV, também foi observado que as partículas se agregam com uma dispersão instável, no decorrer do tempo. A síntese verde utilizando o látex da planta Sangue de Dragão apresentou-se resultados compatíveis com as técnicas que utilizam os agentes tóxicos, porem sustentável e com baixo custo para a realização.Palavras-chave: Croton lechleri, nanopartículas de ouro, ressonância plasmônica superficial. SYNTHESIS AND CHARACTERIZATION OF COLOIDAL GOLD NANOPARTICLES WITH LATEX AS A REDUCING AGENT ABSTRACT: Traditionally the techniques of synthesis of nanoparticles use toxic solvents, which generate residues potentially harmful to health and the environment. Looking for more sustainable methodologies in the synthesis of nanoparticles several researches has proposed the use of biological agents or part of them, replacing the toxic chemical reagents. Thus, this work proposed to synthesize gold nanoparticles, using green synthesis, that is, the latex of the Dragon Blood plant (Croton lechleri Müll. Arg.) As a reducing agent. The Dragon Blood plant is native to Peru and Bolivia, in Brazil it is found in the North region, in the states of Rondônia, Acre and Amazonas. To perform the synthesis of nanoparticles, searching for conditions of synthesis and improvement of parameters, the technique of nanoparticle vision in colloidal suspension and stability, with monodispersivity, was used. Obtaining monodispersity of the gold nanoparticles, being formed nanoparticles that are in the diameter between 10 nm and 40 nm. The zeta potential was within the range of +/- 30 mV, it was also observed that the particles aggregate with an unstable dispersion over time. The green synthesis using the latex of the Dragon Blood plant presented results compatible with the techniques that use the toxic agents, but sustainable and with low cost to the realization.Keywords: Croton lechleri, gold nanoparticles, superficial plasmon resonance.


Catalysts ◽  
2021 ◽  
Vol 11 (3) ◽  
pp. 347
Author(s):  
Beomjin Kim ◽  
Woo Chang Song ◽  
Sun Young Park ◽  
Geuntae Park

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.


2013 ◽  
Vol 686 ◽  
pp. 8-12 ◽  
Author(s):  
Rabizah Makhsin Siti ◽  
Abdul Razak Khairunisak ◽  
Abdul Aziz Azlan ◽  
Rahmah Noordin

In this work, 10 nm gold nanoparticles (AuNPs) was successfully synthesized via seeded-growth method. The green chemically synthesis of this AuNPs becomes attractive because the growth process does not involve heat. Moreover, this technique has advantages of quick, simple, and low cost process. Sodium borohydrate (NaBH4) was used as a reducing agent while trisodium citrate was used as a source of OH- ions in the seed stage. Hydroxylamine hydrochloride (NH4.3H2O) was used as a slow reducing agent to enlarge 4 nm seeds to 10 nm AuNPs. A 4 ml AuNPs seed was the optimized volume to produce 10 nm AuNPs with great homogeneity and dispersity. A sharp peak of surface plasmon resonance (SPR) measurement at 517 nm proved that 10 nm AuNPs was successfully synthesized via this method. Optical properties of the seeds and grown AuNPs were analyzed using UV-Vis spectroscopy while size and surface morphology were observed using a transmission electron microscopy (TEM). Particle size distribution was measured using Zetasizer. 10 nm AuNPs was then conjugated with streptavidin and goat anti-human IgA. Depending on type of protein, 10 µg/ml of streptavidin and 11.2 µg/ml of goat anti-human IgA were required to conjugate with 10 nm AuNPs. The produced products had binding capability on lateral flow immunoassay (LFI). A few nanometer red-shifted absorption spectrum of 10 nm AuNPs conjugated protein revealed successful conjugation instead of agglomeration. 1% BSA was determined as the optimum concentration to stabilize 10 nm AuNPs conjugated biomolecules.


2013 ◽  
Vol 02 (02) ◽  
pp. 78-86 ◽  
Author(s):  
Pradnya Nalawade ◽  
Tulsi Mukherjee ◽  
Sudhir Kapoor

2013 ◽  
Vol 2013 ◽  
pp. 1-10 ◽  
Author(s):  
Flávio C. Cabrera ◽  
Haider Mohan ◽  
Renivaldo J. dos Santos ◽  
Deuber L. S. Agostini ◽  
Ricardo F. Aroca ◽  
...  

Green chemistry is an innovative way to approach the synthesis of metallic nanostructures employing eco-friendly substances (natural compounds) acting as reducing agents. Usually, slow kinetics are expected due to, use of microbiological materials. In this report we study composites of natural rubber (NR) membranes fabricated using latex fromHevea brasiliensistrees (RRIM 600) that works as reducing agent for the synthesis of gold nanoparticles. A straight and clean method is presented, to produce gold nanoparticles (AuNP) in a flexible substrate or in solution, without the use of chemical reducing reagents, and at the same time providing good size’s homogeneity, reproducibility, and stability of the composites.


RSC Advances ◽  
2014 ◽  
Vol 4 (46) ◽  
pp. 24119-24125 ◽  
Author(s):  
Mujeeb Khan ◽  
Abdulhadi H. Al-Marri ◽  
Merajuddin Khan ◽  
Nils Mohri ◽  
Syed Farooq Adil ◽  
...  

The environmentally friendly and low cost green synthesis of highly reduced graphene oxide usingP. glutinosa


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