Materiales de Construcción, Vol 64, No 314 (2014)

Heterogeneous photocatalysis on construction materials: effect of catalyst properties on the efficiency for degrading NOx and self cleaning


https://doi.org/10.3989/mc.2014.06713

N. Bengtsson
Institute of Construction Science Eduardo Torroja–IETcc (CSIC) - (Madrid-Spain), Spain

M. Castellote
Institute of Construction Science Eduardo Torroja–IETcc (CSIC) - (Madrid-Spain), Spain

Abstract


This paper analyzes the effect of some properties of different catalysts on the photocatalytic activity. The efficiency has been determined for two different processes: NOx abatement and self-cleaning for Rhodamine B and tobacco extract being, the TiO2 based photocatalyst, supported as coatings on white mortar. Eight different catalysts were tested, seven commercial ones and one home-made catalyst with improved visible light absorption properties. Additionally, some of them were submitted to exposition to water and/or calcinations to alter their physical properties. A kinetic approach was used to evaluate the photocatalytic activity, being the first reaction constant (for NO) and just empirical constants (for self-cleaning) the parameters used for the comparison of the different materials. As a result, the efficiency, even for ranking, is dependent on the type of contaminant used in the experiment. In general, NO oxidation and tobacco followed similar trends while no clear relations were found for Rhodamine B.

Keywords


TiO2; Optical; Crystalline and microstructure properties; NOx removal; Self cleaning; Rhodamine B; Tobacco extract; Construction materials

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References


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