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Tuesday, 20 August 2019
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Raw materials & technologies, Applications

Photocatalytic functions of self-compacting architectural glass mortars

Friday, 2 October 2015

Interests in the combined use of titanium dioxide (TiO2) photocatalyts with cementitious materials to produce functional cement based photocatalytic products (PCP) have attracted increasing research attention.

A total inactivation of <emphasize>Escherichia coli</emphasize> was observed after 120&nbsp;min UVA irradiation for the TiO<custom name='sub'>2</custom> coated SCAM. Source: Lupe tigatelu/Fotolia
A total inactivation of Escherichia coli was observed after 120 min UVA irradiation for the TiO2

However, an effective method to obtain a high photocatalytic efficiency, thus multiple photocatalytic functions, is in strong demand. A study investigated the strategy of directly applying a TiO2 containing paint on the surface of self-compacting architectural mortars (SCAM). For comparison, 5% TiO2-intermixed SCAM samples were also prepared.

High efficiency in xylene and dye degradation

The results showed that the TiO2 coated SCAM sample displayed a high photocatalytic NOx and xylene removal ability under UV-A and sunlight irradiation conditions. In contrast, 5% TiO2-intermixed samples only achieved a significantly lower NOx removal efficiency, and failed to degrade xylene. In addition, the TiO2 coating on the SCAM surface also demonstrated a high rhodamine B (RhB) degradation ability. Moreover, a total inactivation of Escherichia coli was observed after 120 min UVA irradiation for the TiO2 coated SCAM. Whereas, the 5% TiO2-intermixed SCAM only exhibited a negligible E. coli killing activity. All the architectural mortar samples were found to have a low bioreceptivity. Overall, the TiO2 coated SCAM has the potential to be used as environmentally-friendly products for air-purifying, bactericidal and self-cleaning applications.

The study is published in: Materials & Design, Volume 88, 25 December 2015, Pages 1260-1268.

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