Destroy Odors, Pollutants and Microbes with Photocatalytic Filtration

Depurex photocatalytic filters: your secret weapon against pollution

Since 2011, Depurex has focused on titanium dioxide-activated photocatalytic filtration.

This technology provides high levels of purification for a wide range of pollutants and can also provide a sanitizing effect through the use of UVC rays.

Odor abatement, purification from volatile organic compound pollutants, and bactericidal sanitization: in one filter device.

Activated carbon traps pollutants by giving time for photocatalysis to destroy them, breaking them down. Activated carbon is thus cleaned up, increasing the life of the filter.

Advantages of titanium dioxide filtration:

  • Effectiveness: Can remove a wide range of VOCs, even those with low concentrations.
  • Selectivity: Can selectively attack VOCs, leaving other gases in the air or water unaffected.
  • Environmentally friendly: Does not use hazardous chemicals and does not produce harmful by-products.
  • Low maintenance: Titanium dioxide filters are relatively robust and require minimal maintenance.

Photocatalytic filtration can be used in any application where high performance is required, domestic, industrial, or air emission.

The pressure drop is minimal.

Where photocatalytic filtration is effective

what is photocatalytic filtration

Photosynthesis
Photosynthesis
Photosynthesis
Photosynthesis

Most of us are familiar with chlorophyll photosynthesis. It is the process by which plants convert water, mineral salts and carbon dioxide from the air into nutrients, releasing oxygen.

This transformation requires two elements: chlorophyll, a catalyst, and light, which provides the energy to activate chlorophyll (the term photosynthesis comes from the Greek word “photo,” meaning “light”).

In photosynthesis, light provides energy to chlorophyll, which uses it to create carbon (C) from CO2, hydrogen (H) from H2O, oxygen (O) from O2 in the air, and nitrogen (N) from the fertilizer to form CHON.

In photocatalytic filtration, titanium dioxide (TiO2), also known as white pigment and the ninth most common mineral on the planet, replaces the function of chlorophyll in photosynthesis.

As in chlorophyll photosynthesis, UV light (natural or artificial) activates titanium dioxide. This catalyst breaks down the organic substances absorbed by its surface into their constituent elements: water vapor, carbon dioxide and minerals.

In other words, photocatalysis breaks down the pollutant into water vapor, carbon dioxide and mineral residues.

This process is particularly effective inodor abatement.

Titanium dioxide-activated photocatalytic filtration is thus a simple and natural way to reverse the contamination process, keep surfaces clean, and purify the air. Powerful technology for destroy microbes, volatile organic compounds (VOCs) and chemically active compounds.

To give an idea of the performance that can be achieved with photocatalytic filtration, consider that it can destroy even 0.001-micron particles, whereas HEPA filters, commonly used in the medical field, can retain only 0.3-micron particles.

In addition to filters, the potential of photocatalytic filtration is also used in other applications such as
smog-eating asphalts
and self-cleaning glass(San Gobain Bioclean™, Pilkington Active™ and Sunclean™).

The limits of photocatalysis in air purification

filtro cinese 2
Alibaba Filter

Chinese-made titanium dioxide treated filters available on AliBaba.

Despite scientifically established efficacy, the commercial success of filter products based on photocatalytic filtration has not lived up to expectations.

Let’s try to understand why.

The first applications of this technology were those based on photocatalytic paints applied to solid surfaces (walls, furniture, etc.).

These applications are effective if the goal is to sanitize only the surface but are not suitable for purifying the air. Think of a room completely covered with titanium dioxide paint: only the small part of the air in contact with the walls will be purified.

Products introduced to the market as “filters” with this type of construction, such as filters made of ceramic or metallic material coated with titanium dioxide, do not exceed these limits: since they are wide-meshed, only a small part of the air comes into contact with titanium dioxide.

In addition, they do not meet a prerequisite: contact time.

Photocatalysis is not instantaneous; it needs a contact time between the pollutant and the catalyst, which does not occur in crossing this type of filter.

Depurex filters, on the other hand, use technology that is able to fully exploit the benefits of photocatalytic filtration.

Innovative technology for air purification: photocatalytic filters from Depurex

Depurex has developed a nonwoven filter media that contains highly efficient carbon microspheres. The substrate is treated with titanium dioxide with nanomaterial characteristics, which allows the treatment to adhere uniformly to the fabric without altering its permeability.

This solution addresses critical issues not solved by other products because it ensures that all air passes through the filter and comes into contact with the catalyst.

Pollutants are retained by the carbon microspheres as they pass through, enabling photocatalysis.

When exposed to UV light, natural or artificial, titanium dioxide triggers photocatalysis. This process converts pollutants into water vapor and carbon dioxide, which evaporate, while the remaining minerals are retained.

Depurex has been manufacturing panel and cartridge filters since 2011. These filters use photocatalytic filtration to reduce volatile organic compounds in air emissions and indoor pollution purification and sanitization applications.

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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.