Síntesis verde de nanopartículas de plata para el desarrollo de un nanosensor de fenol y la detección de cu2+
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Date
2024
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Universidad de Concepción
Abstract
La síntesis verde de nanomateriales ofrece una alternativa sustentable y ecológica en comparación a los métodos convencionales de síntesis, utilizando recursos naturales como extractos de planta y microorganismos como agentes estabilizadores y reductores. Este estudio se enfoca en la síntesis verde de nanopartículas (AgNPs) a partir de extracto de hojas de Peumus Boldus (boldo), para su aplicación en el monitoreo de calidad del agua mediante la detección de fenol y de iones de cobre. Las AgNPs fueron sintetizadas variando la concentración de nitrato de plata (AgNO3) y el volumen del extracto de boldo, encontrando que las concentraciones óptimas fueron AgNO3 al 5mM y un 10 % de extracto. Se encontró que las AgNPs poseen una forma esférica y un diámetro promedio de 22.8±4.2 nm. Para la detección de fenol, se fabricó un sensor electroquímico modificando un electrodo de óxido de estaño dopado con fluor (FTO) con las nanopartículas sintetizadas, el cual logró detectar en un rango de 5 - 100 µM utilizando la técnica de voltamperometría de pulso diferencial (DPV). Para la detección de cobre, se empleó espectroscopia UV-Visible con las AgNPs sin modificar, observándose que a medida que se aumenta la concentración de sulfato de cobre (CuSO4), el peak de la resonancia de plasmones superficiales (RSP) de las AgNPs disminuye y una nueva banda de absorción aparece, atribuible a la presencia de iones de cobre, la cual se hace más intensa junto con la concentración de CuSO4, detectando en un rango de 1 - 6 mM. Este estudio demuestra el potencial de las AgNPs de síntesis verde para la detección eficaz y sensible de contaminantes en el agua.
Green 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.
Green 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.
Description
Tesis presentada para optar al grado de Magíster en Ciencias con Mención en Física
Keywords
Fenoles, Sensores, Nanopartículas