Air Purification Performance of Photocatalytic Concrete Paving Blocks after Seven Years of Service
2019
Hubert Witkowski | Wioletta Jackiewicz-Rek | Karol Chilmon | Janusz Jarosławski | Anna Tryfon-Bojarska | Arkadiusz Gąsiński
This paper presents the results of laboratory tests on photocatalytic pavement blocks from a bicycle lane in Poland after seven years of service. Air purification performance was tested on dusty and clean samples using different light sources and setups, with non-laminar gas circulation. Secondary Electrons Secondary Ions (SESI) and InLens detectors combined with SEM−EDS and X-ray analyses were applied to confirm the presence of TiO<sub>2</sub> in the studied blocks. The obtained results show that TiO<sub>2</sub> was present in the form of agglomerates with a diameter of 0.25−5 µm and was bonded to the cement matrix components. The tested samples still maintained nitric oxide (NO) removal capability with a NO reduction rate of 4−45%, depending on light source and surface cleanliness.
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