US National Library of Medicine, Nov 15, 2020
Review on heterogeneous photocatalytic disinfection of waterborne, airborne, and foodborne viruses: Can we win against pathogenic viruses?
Abstract: Microbial pathogenic contaminations have world widely represented a serious health hazard to humans. Viruses, as a member of microbial contaminants, seriously threaten human health due to their high environmental resistance, having small sizes, and causing an extensive range of diseases. Therefore, selecting an appropriate technology to remove viral contaminants from the air, water, and foods is of prominent significance. Traditional methods for viral disinfection have not proven to be highly practical and effective because they need high energy resources and operational expenses. In recent years, semiconductor-based photocatalysis has attracted more attention in the field of microorganism inactivation due to its outstanding performance and mild reaction conditions....
MDPI (Molecular Diversity Preservation International) Article published by the WHO, July 16, 2020
Photocatalysis for Air Treatment Processes: Current Technologies and Future Applications for the Removal of Organic Pollutants and Viruses
Abstract: Photocatalysis for air treatment or photocatalytic oxidation (PCO) is a relatively new technology which requires titanium dioxide (TiO2) and a source of light (Visible or near-UV) to degrade pollutants contained in air streams. Present approaches for the photodegradation of indoor pollutants in air streams aim to eliminate volatile organic compounds (VOCs) and viruses, which are both toxic and harmful to human health. Photocatalysis for air treatment is an inexpensive and innovative green process. Additionally, it is a technology with a reduced environmental footprint when compared to other conventional air treatments which demand significant energy, require the disposal of used materials, and release CO2 and other greenhouse gases to the environment.
US Food and Drug Administration
UV Lights and Lamps: Ultraviolet-C Radiation, Disinfection, and Coronavirus
This Articel shows the Limitations and Risks of Applications only based on UV Light. ETS Airpurification Systems are using Photocatalytic Oxidation with its outstanding performance.
Abstract: Given the current outbreak of Coronavirus Disease 2019 (COVID-19) disease caused by the novel coronavirus SARS-CoV-2, consumers may be interested in purchasing ultraviolet-C (UVC) lamps to disinfect surfaces in the home or similar spaces. The FDA is providing answers to consumers’ questions about the use of these lamps for disinfection during the COVID-19 pandemic.
University of Michigan, Published on 
, April 8, 2019
Cold plasma can kill 99.9% of airborne viruses
Abstract: "The results tell us that nonthermal plasma treatment is very effective at inactivating airborne viruses," said Krista Wigginton, assistant professor of civil and environmental engineering. "There are limited technologies for air disinfection, so this is an important finding."
This parallel approach -- combining filtration and inactivation of airborne pathogens -- could provide a more efficient way of providing sterile air than technologies used today, such as filtration and ultraviolet light.
Note: ETS Products Philippines uses a 5-Tier Purification System including HEPA Filtration, Photocatalytic Oxidation and Bipolar (cold) Plasma.
https://www.sciencedaily.com/releases/2019/04/190408161630.htm
