indoor air quality

For most of our day, we breathe indoors, at home, and in the office, and it is this air quality that should therefore concern us most.

In addition to viruses and microorganisms, volatile organic compounds are consistently listed as one of the most significant pollutants in indoor environments.

Sources of Volatile Organic Compounds (VOCs) pollution in indoor air are diverse and affect somewhat all household objects and activities: primarily construction and furnishing materials (whose emissions persist even for years), cosmetic or deodorizing products, cigarette smoke, cleaning materials and various products (e.g., glues, adhesives, solvents, paints), recently processed clothes in the laundry, heating devices, printers and photocopiers.

Thus, air quality is not only about “outdoor” environmental pollution but, even more so, about indoor residential and workplaces, since volatile organic compounds exist as gases at room temperature and the main route of exposure is through normal breathing.

the sum of two benefits

Photocatalysis has been shown to kill a wide range of organisms, including Gram-negative and Gram-positive bacteria, including endospores, fungi, algae, protozoa, and viruses, as well as to inactivate prions. Photocatalysis has also been shown to destroy microbial toxins.

Photocatalysis not only kills bacterial cells but also decomposes them.

The killing mechanism involves the degradation of the cell wall and cytoplasmic membrane due to the production of reactive oxygen species, such as hydroxyl radicals and hydrogen peroxide. This leads initially to leakage of cellular contents, then to cell lysis, and may be followed by complete mineralization of the organism. Killing is most efficient when there is close contact between the organisms and the TiO2 catalyst.

Titanium dioxide performs better than any other antibacterial agent because the photocatalytic reaction occurs even when there are cells covering the surface and the multiplication of bacteria is active, activating on the surface and bypassing the biofilm created by the bacteria. It proves effective where traditional chemical sanitizers perform less well. In addition, the endotoxin resulting from cell death is decomposed due to the photocatalytic action.

Titanium dioxide does not degrade and shows a long-term antibacterial and virucidal effect. In general, disinfection by titanium dioxide is 3 times more effective than disinfection by chlorine, and 1.5 times of ozone.

The advantage of using photocatalysis along with conventional air filtration is that the filters are also self-cleaning.

the sum of two benefits

The sterilizing effects ofultraviolet germicidal irradiation (UVGI) were discovered in the late 1800s and became established in the 1900s; UVCs modifies the DNA or RNA of microorganisms and thus prevent them from reproducing or being harmful.

The recent pandemic has elevated attention on air sanitation, and studies on the germicidal efficacy of UVCs have received further, numerous confirmations.

Because the photocatalytic process of TiO2 is also activated by emissions in the UVC range, the two systems are excellent partners for developing a filter system that, in a single step, abates:

– Bad smells
– Germs, bacteria and viruses

So why not take advantage of this opportunity to provide a total response to a problem that is comprehensive?

All filters in the Depurex photocatalytic range can be activated by a UVC light source to achieve an exceptional level of purification.

Photocatalytic filtration, combined with UVCs, is the most advanced answer to making air handling units that are truly effective in indoor pollution abatement and air sanitization.

from the blog


Odor abatement: types and methods

Odor abatement is the process of reducing or eliminating unpleasant odors from an environment.

The perception of a bad odor should not be underestimated because it may not relate exclusively to the well-being aspect, namely perceived annoyance, but could be indicative of the presence of a pollutant in the air and therefore harmful to health.

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Depurex progetta e produce filtri fotocatalitici trattati al biossido di titanio per l’abbattimento di composti organici volatili, di cattivi odori e la sanificazione dell’aria da virus e batteri.