Green Synthesis of Homogeneous Gold Nanoparticles Using Sargassum spp. Extracts and Their Enhanced Catalytic Activity for Organic Dyes

Abstract

Sargassum species-based extracts were used to carry out the synthesis of homogeneous gold nanoparticles. Various techniques were used to determine the characteristics and composition of the nanoparticles. The UV-Vis results showed that the 50% water/ethanol extract had the most reducing agents and stabilizers. Therefore, this type of extract was used to synthesize nanoparticles and for their subsequent characterization. Crystallinity and crystal size were evaluated using X-ray diffraction. Size and morphology were analyzed using scanning electron microscopy, showing that the gold nanoparticles were mostly spherical, with a size range of 15–30 nm. The catalytic activity of the gold nanoparticles was evaluated through the degradation of organic dyes: methylene blue, methyl orange, and methyl red. The degradation rates were different, depending on the nature of each dye, the simplest to degrade was methylene blue and methyl red was the most difficult to degrade. The results indicated that the use of Sargassum spp. for the synthesis of gold nanoparticles has potential in the remediation of water that is contaminated with organic dyes. Moreover, given the recent serious environmental and economic problems caused by the overpopulation of Sargassum spp. in the Mexican Caribbean, the findings hold promise for their practical and sustainable use in the synthesis of nanomaterials.

Phytogenically bioengineered metal nanoarchitecture for degradation of refractory dye water pollutants: A pragmatic minireview

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Nanoarchitectonics of an acetogenin-enriched nanosystem mediated by an aqueous extract of Annona cherimola Mill with anti-inflammatory and proapoptotic activity against HepG2 cell line

“…In gold, the LSPR is displayed between 500 and 600 nm. The position of this signal is inversely proportional to the size of the nanoparticles, while the intensity of the absorption band is directly proportional to the concentration [42]. Hence, UV-vis spectroscopy could be a helpful technique that allows the estimation of the particle size by analyzing the extinction spectra of the AuNPs-Ac using the MIE theory.…”

A Review on the Synthesis and Fabrication of Gold Nanoparticles and Their Application in Dyes Degradation

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