Browsing by Author "Saavedra Reveco, Macarena"
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Item Síntesis verde de nanopartículas de plata para el desarrollo de un nanosensor de fenol y la detección de cu2+.(Universidad de Concepción, 2024) Saavedra Reveco, Macarena; Benito Gómez, Noelia; Yévenes Burgos, MarielaGreen synthesis of nanomaterials offers a sustainable and environmentally friendly alternative to conventional synthesis methods, using natural resources such as plant extracts and microorganisms as stabilising and reducing agents. This study focuses on the green synthesis of nanoparticles (AgNPs) from the leaf extract of Peumus Boldus for application in water quality monitoring by detecting phenol and copper ions. AgNPs were synthesised by varying the concentration of silver nitrate (AgNO3) and the volume of boldo extract, finding that the optimum concentrations were AgNO3 at 5mM and 10 % extract. AgNPs were found to have a spherical shape and an average diameter of 22.8±4.2 nm. For phenol detection, an electrochemical sensor was fabricated by modifying a fluorine-doped tin oxide (FTO) electrode with the synthesised nanoparticles, which was able to detect in the range of 5 - 100 muM using the differential pulse voltammetry (DPV) technique. For the detection of copper, UV-Visible spectroscopy was employed with the unmodified AgNPs, observing that as the concentration of copper sulphate (CuSO4) is increased, the surface plasmon resonance (SPR) of the AgNPs decreases and a new absorption band appears, attributable to the presence of copper ions, which becomes more intense along with the concentration of CuSO4, detecting in a range of 1 - 6 mM. This study demonstrates the potential of green-synthesised AgNPs for the efficient and sensitive detection of contaminants in water.