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Photo-active float for field water disinfection.

R Shwetharani1, R Geetha Balakrishna

  • 1Centre for Nano and Material Sciences, Jain University, Jain Global Campus, Bangalore-562112, India. cnms.jainuniversity.ac.in br.geetha@jainuniversity.ac.in.

Photochemical & Photobiological Sciences : Official Journal of the European Photochemistry Association and the European Society for Photobiology
|March 1, 2016
PubMed
Summary

This study shows that a novel photoactive float using nitrogen-fluorine titanium dioxide (N-F-TiO2) effectively disinfects contaminated field water. Sunlight activates the N-F-TiO2 to release reactive oxygen species, eliminating harmful Gram-positive and Gram-negative bacteria.

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Area of Science:

  • Environmental Science
  • Materials Science
  • Microbiology

Background:

  • Field water is often contaminated with Gram-positive and Gram-negative bacteria, posing a public health risk.
  • Disinfection methods are crucial for ensuring water safety, especially in resource-limited settings.
  • Photocatalysis offers a promising approach for water purification using light-activated materials.

Purpose of the Study:

  • To investigate the antibacterial efficacy of a visible light-activated N-F-TiO2 photoactive float for field water disinfection.
  • To assess the ability of N-F-TiO2 to eliminate common Gram-positive and Gram-negative bacterial contaminants.
  • To confirm water purity and bacterial inactivation using standard analytical methods.

Main Methods:

  • Fabrication of a photoactive float using visible light active N-F-TiO2.
  • Exposure of contaminated field water to sunlight for photocatalytic disinfection.
  • Characterization of N-F-TiO2 nanoparticles using XRD, BET, SEM, EDX, UV-Vis, and PL analysis.
  • Confirmation of bacterial inactivation via standard plate count (SPC), MDA, RNA, and DNA analysis.

Main Results:

  • N-F-TiO2 nanoparticles effectively released reactive oxygen species under sunlight illumination.
  • Complete elimination of Gram-positive (Staphylococcus aureus, Bacillus species) and Gram-negative (Salmonella typhimurium, Escherichia coli, Pseudomonas species) bacteria was achieved.
  • Water purity was validated by SPC, showing zero bacterial counts after two days of storage and testing.

Conclusions:

  • The developed N-F-TiO2 photoactive float demonstrates significant potential for effective and sustainable field water disinfection.
  • Visible light-activated N-F-TiO2 is a viable photocatalyst for removing diverse bacterial contaminants from water.
  • This technology offers a promising solution for improving access to safe drinking water.