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Photocatalytic Composite Nanomaterial and Engineering Solution for Inactivation of Airborne Bacteria

Abstract

In this study we propose a new composite material with an enhanced bactericidal action that utilises the complex interactions with bacteria: mechanical interactions of the bacteria with ZnO tetrapod spikes, a photocatalytic process on ZnO nanoparticles, and disinfection by Ag nanoparticles. ZnO and Ag nanoparticles were immobilised on a single-crystalline ZnO tetrapod by the ultrasonic mixing method. The XRD, TEM, SEM and EDS analyses showed the tetrapod-like crystals covered by ZnO and Ag nanoparticles. This complex photocatalytic material, deposited on a grid support, was tested in the UV purifier air system in the AR Diagnostic company. The active microbial monitoring of the indoor air showed a decrease in the concentration of bacteria in the air of the meeting room, with the door open, at 90% for a duration of 30–40 min. A simple variant of the design of an air purifier system, which can be mounted in different types of air channels and compartments, is proposed.

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Acknowledgements

The authors are thankful the H2020-MSCA-RISE-2015 Programme, project N 690968 NANOGUARD2AR for support of this work. The authors are also thankful to A. Chauvin for colonies counting.

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Correspondence to Igor Danilenko.

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Danilenko, I., Gorban, O., da Costa Zaragoza de Oliveira Pedro, P.M. et al. Photocatalytic Composite Nanomaterial and Engineering Solution for Inactivation of Airborne Bacteria. Top Catal 64, 772–779 (2021). https://doi.org/10.1007/s11244-020-01291-2

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Keywords

  • ZnO composite photocatalyst
  • Airborne bacteria
  • Air purification system