Determination of the air-purification effect of photocatalytically active materials and surfaces

Determination of photocatalytic air purification – degradation of nitrogen oxide.
© Fraunhofer IST, Ronald Frommann
Determination of photocatalytic air purification – degradation of nitrogen oxide.

Neutral and independent testing and evaluation of air-purifying products

As a member of the DIN Photocatalysis Standards Committee and a recognized test laboratory of the German Association of Applied Photocatalysis (FAP), the Fraunhofer IST offers its customers standard tests of their photocatalytically active products in accordance with the currently applicable national and international test standards as well as certification of their products in accordance with the guidelines of the FAP. In addition, we carry out customer-specific tests as part of the product development process and thus offer our customers a comprehensive range of services for evaluating everything from material to application.

A wide range of standardized test methods

The Fraunhofer IST has various methods at its disposal for the detection and quantification of the pollutant degradation of photocatalytically active products in the air with regard to the following pollutants:

  • NO, NO2, (O3), including ISO 22197-1, ISO 17168-4, prEN 16980-1, DIN 19279
  • Acetaldehyde (ISO 22197-2, ISO 17168-2)
  • Toluene (ISO 22197-3, ISO 17168-3)
  • Formaldehyde (ISO 22197-4, ISO 17168-4)

The use of different reactor types (e.g. for planar samples, non-wovens or bulk materials) and light sources (fluorescent lamps, LEDs) thereby allows a wide variety of products to be tested.

Determination of the decomposition of nitrogen oxide according to ISO 22197-1

Measuring facility for the determination of photocatalytic air-purification capacity.
© Fraunhofer IST, Falko Oldenburg
Measuring facility for the determination of photocatalytic air-purification capacity.

In this method, the substrate to be tested is continuously exposed to the pollutant nitric oxide (NO) with simultaneous UV irradiation, which is oxidized to nitrate by the photocatalytic process. The reaction rate of the degradation reaction of NO allows a quantitative assessment of the photocatalytic efficiency of the tested surfaces if the environmental parameters (wavelength, irradiance, gas concentrations and conditions, etc.) are known.

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