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Precisely Engineered Photoreactive Titanium Nanoarray Coating to Mitigate Biofouling in Ultrafiltration.

Lei Zhang1,2, Xingxing Shi1, Meng Sun2

  • 1Department of Chemical Engineering and Material Science, Tianjin University of Science & Technology, Tianjin 300457, P. R. China.

ACS Applied Materials & Interfaces
|February 22, 2021
PubMed
Summary

This study developed a stable titanium dioxide (TiO2) nanoarray coating for membranes using atomic layer deposition and solvothermal methods. The novel TiO2 coating effectively prevents biofouling and enhances membrane performance.

Keywords:
TiO2 nanoarrayantifoulingantimicrobial activityatomic layer depositionphotoreactivereactive oxygen speciesultrafiltration membrane

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Surface Chemistry

Background:

  • Biofouling on membranes reduces efficiency and requires frequent cleaning.
  • Titanium dioxide (TiO2) nanostructures show antimicrobial properties but traditional coatings lack stability.
  • Developing durable and effective antimicrobial coatings is crucial for membrane applications.

Purpose of the Study:

  • To create a stable and uniform TiO2 nanoarray coating on polytetrafluoroethylene (PTFE) ultrafiltration membranes.
  • To enhance the antimicrobial efficacy and durability of TiO2 coatings for biofouling control.
  • To investigate the mechanisms behind the antimicrobial activity of the TiO2 nanoarray.

Main Methods:

  • Stepwise fabrication using atomic layer deposition (ALD) for uniform seeding of TiO2 nanoparticles.
  • Solvothermal deposition to assemble and align TiO2 nanoparticles into a nanoarray forest.
  • Characterization of the TiO2 nanoarray structure and assessment of its antimicrobial activity under sunlight.

Main Results:

  • ALD enabled precise, uniform seeding of TiO2 nanoparticles on the membrane surface.
  • Solvothermal deposition successfully formed a uniform, aligned TiO2 nanoarray.
  • The TiO2 nanoarray demonstrated effective inactivation of bacteria and improved flux recovery after cleaning.
  • Antimicrobial action involved physical membrane damage and light-induced reactive oxygen species (ROS) production.

Conclusions:

  • A robust bottom-up synthesis method for stable TiO2 nanoarrays on membranes was established.
  • The developed TiO2 nanoarray coating offers a promising solution for antifouling applications in ultrafiltration.
  • This approach provides a tunable strategy for designing advanced antifouling surfaces for diverse applications.