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<p>The application of advanced nanotechnology in conventional water treatment processes offers new technological opportunities for sustainable disinfection. This study investigated the antibacterial properties of silver nanoparticles (AgNPs) individually and in conjunction with near-UV (412&#xa0;nm) and blue (460&#xa0;nm) light emitting diodes (LEDs) against <i>Escherichia coli</i> (<i>E. coli</i>) in water. The AgNPs-loaded disc combined with near-UV and blue LEDs irradiation achieved 4.03- and 3.65 log₁₀ reductions respectively in <i>E. coli</i>, significantly higher than those achieved by either treatment (<i>p</i> &lt; 0.0001). The lower performance of near-UV LEDs alone is suggestive to its limited penetration power as compared to blue light, however when coupled with AgNPs, pronounced synergistic effect was observed, likely due to enhanced generation of reactive oxygen species (ROS) from photoactivated silver nanoparticles. LEDs and NPs-loaded disc synergistically boost ROS generation thus accelerated bacterial inactivation when they work in concert for 45&#xa0;min of treatment. Moreover, the nanoparticles-loaded disc and blue light used independently also showed potential as a low-cost, scalable solution for bacterial disinfection in water. Unlike conventional systems, this approach harnesses nanomaterial that works through ROS mediated bacterial inactivation thus eliminating the need for chemical additives or complex infrastructure. This strategy may reduce the reliance on chemicals for disinfection and can also be explored as a promising alternative to anitbiotics and is expected to exert low selective pressure for bacterial resistance development.</p> Graphical Abstract <p></p>

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An exploratory study on the antibacterial activity of silver nanoparticles with near-UV and blue LEDs against E. coli disinfection in water

  • 期刊论文

  • 发表日期：

    2026年7月22日

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  • Rafaqat Ali Khan,
  • Shahzad Anwar,
  • Munib Ahmed Shafique,
  • Muhammad Bilal Khan,
  • Hina Ali

摘要

The application of advanced nanotechnology in conventional water treatment processes offers new technological opportunities for sustainable disinfection. This study investigated the antibacterial properties of silver nanoparticles (AgNPs) individually and in conjunction with near-UV (412 nm) and blue (460 nm) light emitting diodes (LEDs) against Escherichia coli (E. coli) in water. The AgNPs-loaded disc combined with near-UV and blue LEDs irradiation achieved 4.03- and 3.65 log₁₀ reductions respectively in E. coli, significantly higher than those achieved by either treatment (p < 0.0001). The lower performance of near-UV LEDs alone is suggestive to its limited penetration power as compared to blue light, however when coupled with AgNPs, pronounced synergistic effect was observed, likely due to enhanced generation of reactive oxygen species (ROS) from photoactivated silver nanoparticles. LEDs and NPs-loaded disc synergistically boost ROS generation thus accelerated bacterial inactivation when they work in concert for 45 min of treatment. Moreover, the nanoparticles-loaded disc and blue light used independently also showed potential as a low-cost, scalable solution for bacterial disinfection in water. Unlike conventional systems, this approach harnesses nanomaterial that works through ROS mediated bacterial inactivation thus eliminating the need for chemical additives or complex infrastructure. This strategy may reduce the reliance on chemicals for disinfection and can also be explored as a promising alternative to anitbiotics and is expected to exert low selective pressure for bacterial resistance development.

Graphical Abstract