1. Sophia University, 7-1 Kioi-cho, Chiyoda-ku, Tokyo 102-8554, Japan
Photocatalytic Active Building Materials: Are They Affecting the Air Quality in the Urban Environment?
Ralf Dillert
Sophia University, 7-1 Kioi-cho, Chiyoda-ku, Tokyo , Japan
Permanent address: Institut für Technische Chemie, Leibniz Universität Hannover, Callinstr. 3, Hannover, Germany

2. Photocatalytic Products for Passive Air Treatment
Cement
Pavement Stones
Roofing Stones …
Tiles
Roofing Tiles
Plasters
Façade Paints

3. Testing the Photocatalytic Activity: Oxidation of NO (ISO 22197-1)
Test Conditions
cNO,in = 1000 ppb in air
T = 25 °C
hr = 50 %
EUV = 10 W m-2

4. Photocatalytic NO Oxidation

5. Environmental Conditions
Weather Conditions
Temperature
Humidity
UV Irradiance
Urban Air Pollution

6. Temperature

7. Humidity

8. Light Intensity (UV Irradiance)

9. Kinetics of Photocatalytic NO Oxidation
N. Bengtsson and M. Castellote, J. Adv. Oxid. Technol., 2010, 13, 341.
M. Hunger, G. Hüsken and J. Brouwers, Cement Concrete Res., 2010, 49, 313.
M. M. Ballari et al., Catal. Today, 2010, 151, 71.
M. M. Ballari et al., Appl. Catal. B: Environ., 2010, 95, 245.

10. Kinetics of Photocatalytic NO Oxidation: Influence of Irradiance and NO Concentration
Dillert et al., Phys. Chem. Chem. Phys. 2013, 15,

11. Kinetics of Photocatalytic NO Oxidation: Influence of Irradiance and NO Concentration
Dillert et al., J. Hazard Mater. 2012, ,

12. Kinetics of Photocatalytic NO Oxidation: Influence of Irradiance and NO Concentration
Dillert et al., J. Hazard Mater. 2012, ,
Dillert et al., Phys. Chem. Chem. Phys. 2013, 15,

13. Kinetics of Photocatalytic NO Oxidation: Influence of Humidity
Dillert et al., unpublished results.

14. Kinetics of Photocatalytic NO Oxidation: Influence of Humidity
Dillert et al., unpublished results.

15. Environmental Conditions
Weather Conditions
Urban Air Pollution
NO, NO2, HONO, … CO
SO2
Organic Compounds (BTEX, Acids, Aldehydes, …)
Particulate Matter (C, Organic Compounds, NH4NO3, other Inorganic Compounds)

16. Pollutant Concentration
Concentration / µg m-3

17. Photocatalytic Treatment of NO/NO2 Mixtures
cNO,in + cNO2,in = cNOx,in ≈ const
experimentell run
Dillert et al., unpublished results.

18. Photocatalytic Oxidation of Urban Air Pollutants
NOx → NO3– NH3 → N2, NOx, NO3– SO2 → SO42– CxHyX → x CO2 + y/2 H2O + X –

19. Summary

20. Are Photocatalytic Active Building Materials Affecting the Air Quality in the Urban Environment?

21. Prof. Dr. Detlef Bahnemann
Acknowledgement
Dipl. chem. Astrid Engel
Dipl.chem. Olga Raisch
Dipl.chem. Anna Glyk
Dr. Julia Große
Prof. Dr. Detlef Bahnemann
Financial Support: BMBF (03X0069F, “HelioClean – Nanotechnologisch funktionalisierte Baustoffe zur solarkatalytischen Luft- und Oberflächenreinigung”)