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Abstract <p>Silver nanoparticles (AgNP) were prepared using the fresh leaf extract of <i>Coleus</i> <i>amboinicus</i> (CA) as both the capping and reducing agent through a microwave-assisted method. The phytosynthesized AgNP with CA (AgNP-CA) demonstrated highly selective optical and electrochemical sensing capabilities for mercuric ions. The AgNP-CA and complexation AgNP-CA with Hg<sup>2+</sup> ions (AgNP-CA-Hg<sup>2+</sup>) were characterized using UV-vis spectroscopy, X-ray diffraction (XRD), Fourier-transform infrared (FTIR), energy-dispersive X-ray (EDX), transmission electron microscopy (TEM), zeta potential, and dynamic light scattering (DLS) techniques. The effective complexation of AgNP-CA with Hg<sup>2+</sup> ions resulted in visually observable colour changes, confirmed by UV-vis spectroscopy. The green-fabricated electrochemical AgNP-CA modified platinum electrode (AgNP-CA-Pt) sensor exhibited a limit of detection (LOD) of 0.8524 µM using the differential pulse voltammetry (DPV) method. The catalytic potential of AgNP-CA for the reduction of toxic organic dyes, Congo Red and Safranin, using NaBH<sub>4</sub> was also examined. The catalytic reductions were completed within a few minutes and followed a pseudo-first-order kinetics model. The linear relationship between catalyst concentration and reduction rates was experimentally determined. This eco-friendly approach to AgNP-CA synthesis and its applications is a useful tool for monitoring and managing environmental pollution.</p>

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Microwave Assisted Phytosynthesised Silver Nanoparticles for the Sensing of Toxic Mercuric Ions and as Catalyst for the Treatment of Environmental Pollutants

  • 期刊论文

  • 发表日期：

    2025年4月1日

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  • Mamatha Susan Punnoose,
  • Binila K. Korah,
  • Beena Mathew

摘要

Abstract

Silver nanoparticles (AgNP) were prepared using the fresh leaf extract of Coleus amboinicus (CA) as both the capping and reducing agent through a microwave-assisted method. The phytosynthesized AgNP with CA (AgNP-CA) demonstrated highly selective optical and electrochemical sensing capabilities for mercuric ions. The AgNP-CA and complexation AgNP-CA with Hg2+ ions (AgNP-CA-Hg2+) were characterized using UV-vis spectroscopy, X-ray diffraction (XRD), Fourier-transform infrared (FTIR), energy-dispersive X-ray (EDX), transmission electron microscopy (TEM), zeta potential, and dynamic light scattering (DLS) techniques. The effective complexation of AgNP-CA with Hg2+ ions resulted in visually observable colour changes, confirmed by UV-vis spectroscopy. The green-fabricated electrochemical AgNP-CA modified platinum electrode (AgNP-CA-Pt) sensor exhibited a limit of detection (LOD) of 0.8524 µM using the differential pulse voltammetry (DPV) method. The catalytic potential of AgNP-CA for the reduction of toxic organic dyes, Congo Red and Safranin, using NaBH4 was also examined. The catalytic reductions were completed within a few minutes and followed a pseudo-first-order kinetics model. The linear relationship between catalyst concentration and reduction rates was experimentally determined. This eco-friendly approach to AgNP-CA synthesis and its applications is a useful tool for monitoring and managing environmental pollution.