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<p>This study presents a pioneering 'dual-action' strategy for advanced wastewater remediation by engineering a bifunctional nanohybrid for solar-driven organic pollutant degradation and targeted pathogen disinfection (selective antibacterial activity). This gives a significant advancement in sustainable nanotechnology by introducing green, one-pot synthesis of a silver -decorated carbon dot nanohybrids (AgNP@NCD) using&#xa0;<i>Azadirachta Indica</i>&#xa0;(<i>Neem</i>) leaf extract. In this novel approach, high quantum yield, intensely blue fluorescent Neem-derived nitrogen and oxygen co-doped carbon dots (NCDs) uniquely function as both a green reducing agent and a stabilizing scaffold, eliminating the need for external toxic chemicals. Comprehensive characterization via HR-TEM, XPS, FTIR, and UV–Vis spectroscopy confirmed the successful formation of AgNP@NCD hetero nano structures with effective O and N doping, with high Quantum yield(67%). The resulting AgNP@NCD heterostructures were used for solar-light-driven photocatalytic degradation of Methylene Blue (MB). The hybrid nanocatalysts demonstrated outstanding performance, achieving 97% degradation within 6&#xa0;h of exposure to solar energy with a mere 5&#xa0;mg catalyst load. Kinetic studies revealed that the photodegradation process followed a pseudo-first-order model, with the AgNP@NCD hybrid achieving the highest rate constant of 5.03 × 10⁻<sup>3</sup>&#xa0;min⁻<sup>1</sup>. Beyond its photocatalytic prowess, it also demonstrated significant and selective antibacterial activity, showing a clear zone of inhibition (14 ± 1.2&#xa0;mm) against&#xa0;<i>Serratia marcescens</i>. This present a solar-harvesting, Ag-decorated carbon dot nanohybrid that redefines sustainable remediation by functioning as an autonomous 'dual-action' platform for simultaneous organic pollutant degradation and targeted pathogen disinfection.</p> Graphical Abstract <p></p>

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A Multifunctional Green-Synthesized Silver-Carbon Dot Nano-Hybrid from Azadirachta Indica for enhanced Solar Light-Driven Photodegradation of pollutants and Selective Antibacterial Activity in Water Treatment

  • 期刊论文

  • 发表日期：

    2026年3月25日

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  • Arun John,
  • Rinu Elizabeth Roy,
  • S. Parvathy,
  • Sajna Salim

摘要

This study presents a pioneering 'dual-action' strategy for advanced wastewater remediation by engineering a bifunctional nanohybrid for solar-driven organic pollutant degradation and targeted pathogen disinfection (selective antibacterial activity). This gives a significant advancement in sustainable nanotechnology by introducing green, one-pot synthesis of a silver -decorated carbon dot nanohybrids (AgNP@NCD) using Azadirachta Indica (Neem) leaf extract. In this novel approach, high quantum yield, intensely blue fluorescent Neem-derived nitrogen and oxygen co-doped carbon dots (NCDs) uniquely function as both a green reducing agent and a stabilizing scaffold, eliminating the need for external toxic chemicals. Comprehensive characterization via HR-TEM, XPS, FTIR, and UV–Vis spectroscopy confirmed the successful formation of AgNP@NCD hetero nano structures with effective O and N doping, with high Quantum yield(67%). The resulting AgNP@NCD heterostructures were used for solar-light-driven photocatalytic degradation of Methylene Blue (MB). The hybrid nanocatalysts demonstrated outstanding performance, achieving 97% degradation within 6 h of exposure to solar energy with a mere 5 mg catalyst load. Kinetic studies revealed that the photodegradation process followed a pseudo-first-order model, with the AgNP@NCD hybrid achieving the highest rate constant of 5.03 × 10⁻3 min⁻1. Beyond its photocatalytic prowess, it also demonstrated significant and selective antibacterial activity, showing a clear zone of inhibition (14 ± 1.2 mm) against Serratia marcescens. This present a solar-harvesting, Ag-decorated carbon dot nanohybrid that redefines sustainable remediation by functioning as an autonomous 'dual-action' platform for simultaneous organic pollutant degradation and targeted pathogen disinfection.

Graphical Abstract