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IET Nanobiotechnol ; 12(4): 479-483, 2018 Jun.
Article in English | MEDLINE | ID: mdl-29768233

ABSTRACT

The present study investigated the synthesis of gold nanoparticles (AuNPs) using mangrove plant extract from Avicennia marina as bioreductant for eco-friendly bioremediation of 4-nitrophenol (4-NP). The AuNPs synthesised were confirmed by UV spectrum, transmission electron microscopy (TEM), X-ray diffraction, Fourier transmission infrared spectroscopy (FTIR), dynamic light scattering (DLS), and zeta potential. The AuNPs were found to be spherical in shape with size ranging from 4 to 13 nm, as evident by TEM and DLS. Further, the AuNPs were encapsulated with sodium alginate in the form of gold nano beads and used as heterogeneous catalyst and degrading agent to reduce 4-NP. This reduction in 4-NP into 4-aminophenol was confirmed by UV and FTIR. The aqueous solution of 4-NP peaked its absorbance at 320 nm, and shifted to 400 nm, with an intense yellow colour, appeared due to formation of 4-nitrophenolate ion. After the addition of AuNps, the 4-NP solution became colourless and peaked at 400 nm and reduced to 290 nm corresponding to the formation of 4-aminophenol. Hence, the present work suggested the AuNPs as the potent, eco-friendly bionanocomposite catalyst for bioremediation of 4-NP.


Subject(s)
Aminophenols/chemistry , Gold/chemistry , Green Chemistry Technology/methods , Metal Nanoparticles/chemistry , Nitrophenols/chemistry , Avicennia/chemistry , Biodegradation, Environmental , Nanocomposites/chemistry , Oxidation-Reduction , Particle Size , Plant Extracts/chemistry , Plant Extracts/metabolism , Spectrophotometry, Ultraviolet
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