Review Article - Journal of Chemical Technology and Applications (2021) Volume 4, Issue 3
Indoor air disinfection in dynamic dark operating conditions
It is well knowledge that working males spend 90 percent of their day (21.7 hours) indoors, whereas married housewives spend 95 percent of their day (22.8 hours) indoors. In this context, one of the strategic goals in the domains of community hygiene and healthcare is indoor air conditioning (climatic, chemical, and antimicrobial). The photocatalytic air recycling techniques are presently receiving the most attention among recent technologies used for indoor air antibacterial cooling. External energy inputs are required to activate all photocatalysts (energetically-dependent materials). The energy costs of long-duration recycling photocatalytic systems become particularly critical in voluminous restricted areas. The prospects of using non-photocatalytic dark-operating active compounds for germicidal conditioning of ambient media have also been considered. These species, which are most commonly found as metal or metal oxide-based nanomaterials (M/MO-NMs), including free nanoparticles (NPs), have been proclaimed to be energetically independent, meaning that they do not require external excitation to function. The most commonly investigated contributing element to the germicidal capacity of the materials under investigation is oxidative stress caused by reactive oxygen species (ROS) generated when M/MO-NMs and NPs surfaces come into contact with humid media. Certain fibrous and tube-like shaped species have a second mechanism that can cause significant mechanical cellular injury. DOGMs (darkoperating germicidal materials) are mostly used in an aqueous media and are frequently used in static situations. The results of the deployment of two new DOGM types for dynamic indoor air antimicrobial conditioning in recycling working mode are discussed in this paper: a MnO2-based interactive ROS generator and a ZnO-based blade-needle-shaped cellular destructor (300 L pilot unit, airborne bacteria, real-time viable particle counter 9510-BD BioTrak, different circulation rates). People in wealthy nations spend more than 85% of their time in confined spaces. In this context, one of the strategic goals in the domains of community hygiene and healthcare is indoor air conditioning (climatic, chemical, and antimicrobial). The photocatalytic air recycling techniques are presently receiving the most attention among recent technologies used for indoor air antibacterial cooling. Photocatalysts have been at the forefront of bacteria inactivation research since Matsunaga et al. first investigated titanium dioxide TiO2 for this purpose. All photocatalysts, on the other hand, are energy-dependent materials that require external energy to activate. The energy costs of recycling photocatalytic long-duration processes become considerable in large restricted environments. Furthermore, photocatalytic reactions at the surface of an active material require time to complete, and the contact time between the disinfecting agent and the air is a key component in air conditioning processes.
Author(s): Alienor Chauvin, Alexei Evstratov, Sandrine Bayle and Lionel Sabourin