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<p>The abatement of environmental hazards through a facile and clean approach using nanoparticles bio-converted from medicinal plants has recently attracted increased amounts of attention. By leveraging LED technology, this study presents an innovative approach for the photocatalytic degradation of textile dyes, viz. methylene blue, methyl orange, and rhodamine B using phytosynthesized silver/gold nanoparticles (Ag/AuNPs) synthesized from aqueous leaf extract of <i>Swertia chirata</i>. The process parameters were optimized for the maximum synthesis of AgNPs using the central composite design of response surface methodology. The ideal conditions for AgNP synthesis obtained were 23.83% leaf extract (LE), 2.92&#xa0;mM of silver nitrate (AgNO<sub>3</sub>), pH 8.31, and a temperature of 44.60&#xa0;°C. The desirability function validated the accuracy of the model. Phytosynthesis of AuNPs was carried out with the optimized conditions described previously by the present authors following the same modeling approach. The photocatalytic ability of both metal nanoparticles to degrade textile dyes under irradiation of different light-emitting diodes with varying spectral qualities was explored. Differential behavior of photocatalytic activity both in terms of the rate of reaction and degradation efficiency between silver and gold nanoparticles was observed with varying wavebands. The current study is the first to suggest the regulatory role of spectral quality in dye degradation. Monochromatic irradiation of blue LEDs in most cases enhances the photocatalytic performance. A plausible mechanism involving light-specific plasmonic tuning of the LSPR and subsequent transfer of electrons to generate the reactive oxygen species necessary for dye degradation has been proposed. This study explores the photocatalytic degradation of textile dyes using silver/gold nanoparticles (Ag/AuNPs) synthesized from <i>Swertia chirata</i> leaf extract. Optimal conditions for nanoparticle synthesis were determined using response surface methodology, and the photocatalytic performance was evaluated under LED irradiation with varying spectral qualities. Results showed that blue LED light enhances the degradation efficiency, with differential photocatalytic activity observed between AgNPs and AuNPs, linked to plasmonic effects and electron transfer mechanisms.</p> Graphical Abstract <p></p>

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Innovative textile dye treatment using biomass and metal nanoparticles: an eco-luminescent approach

  • 期刊论文

  • 发表日期：

    2025年1月10日

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  • Nirlipta Saha,
  • S. Dutta Gupta

摘要

The abatement of environmental hazards through a facile and clean approach using nanoparticles bio-converted from medicinal plants has recently attracted increased amounts of attention. By leveraging LED technology, this study presents an innovative approach for the photocatalytic degradation of textile dyes, viz. methylene blue, methyl orange, and rhodamine B using phytosynthesized silver/gold nanoparticles (Ag/AuNPs) synthesized from aqueous leaf extract of Swertia chirata. The process parameters were optimized for the maximum synthesis of AgNPs using the central composite design of response surface methodology. The ideal conditions for AgNP synthesis obtained were 23.83% leaf extract (LE), 2.92 mM of silver nitrate (AgNO3), pH 8.31, and a temperature of 44.60 °C. The desirability function validated the accuracy of the model. Phytosynthesis of AuNPs was carried out with the optimized conditions described previously by the present authors following the same modeling approach. The photocatalytic ability of both metal nanoparticles to degrade textile dyes under irradiation of different light-emitting diodes with varying spectral qualities was explored. Differential behavior of photocatalytic activity both in terms of the rate of reaction and degradation efficiency between silver and gold nanoparticles was observed with varying wavebands. The current study is the first to suggest the regulatory role of spectral quality in dye degradation. Monochromatic irradiation of blue LEDs in most cases enhances the photocatalytic performance. A plausible mechanism involving light-specific plasmonic tuning of the LSPR and subsequent transfer of electrons to generate the reactive oxygen species necessary for dye degradation has been proposed. This study explores the photocatalytic degradation of textile dyes using silver/gold nanoparticles (Ag/AuNPs) synthesized from Swertia chirata leaf extract. Optimal conditions for nanoparticle synthesis were determined using response surface methodology, and the photocatalytic performance was evaluated under LED irradiation with varying spectral qualities. Results showed that blue LED light enhances the degradation efficiency, with differential photocatalytic activity observed between AgNPs and AuNPs, linked to plasmonic effects and electron transfer mechanisms.

Graphical Abstract