IMT-Mines Ales, France
Title: Indoor air disinfection in dynamic dark operating conditions
Biography: Alienor Chauvin
It is already a well-known fact that on the average, employed men spend 90% of the day (21.7 h) indoors; as for married housewives, they spend 95% of the day (22.8 h) indoors. In this context, the indoor air conditioning (climatic, chemical, and antimicrobial) is currently one of the strategic priorities in the domain of collective hygiene and healthcare. Among modern technologies applied for the indoor air antimicrobial conditioning, the greatest attention is currently drawn to the photocatalytic air recycling procedures. However, all photocatalysts need to be activated by external energy inputs (energetically-dependent materials). For voluminous confined spaces, the energy costs of long-duration recycling photocatalytic processes become very important. The possibilities of application of non-photocatalytic dark-operating active materials for the environmental media germicidal conditioning were already discussed. These species occurring in the majority of cases, as metal or metal oxide-based nanomaterials (M/MO-NMs), including free nanoparticle (NPs), are declared to be energetically independent: no external excitation is needed for their functioning. The oxidative stress provided by reactive oxygen species (ROS) formed in contact of M/MO-NMs and NPs surfaces with humid media is the most widely probed contributory factor to the germicidal ability of the materials under consideration. The second mechanism which can cause important mechanical cellular damages is available for certain fibrous and tube-like shaped species. The dark-operating germicidal materials (DOGM) are applied predominantly in water medium and often in static conditions. The present contribution discusses the results of the implementation of two new DOGM types: a MnO2-based interactive ROS generator and a ZnO-based blade-needle-shaped cellular destructor, for dynamic indoor air antimicrobial conditioning carried out in recycling operating mode (300 L pilot unit, airborne bacteria, real-time viable particle counter 9510-BD BioTrak, different circulation rates).
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