Photocatalytic performance of calcium aluminate cements modified with TiO2
NOx abatement
Compressive Strength
X-ray Diffraction
Calcium Aluminate Cement
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The authors want to thank Ciments Molins and Kerneos España for the material supplied. This work was funded by Fundación Universitaria de Navarra (grant FUNA2013-15108402) and by Fundación CajaNavarra (under grant 31-2014). M. Pérez also gratefully acknowledges Friends of University of Navarra Inc. for a pre-doctoral grant.
Editorial note: 
The Chinese Ceramic Society; China Building Materials Academy
Pérez-Nicolás M, Navarro-Blasco I, Durán A, Sirera R, Fernández JM, Álvarez JI. "" Photocatalytic performance of calcium aluminate cements modified with TiO2"". EN: The 14th International Congress on the Chemistry of Cement. Abstracts Book 2015 Vol II:382. Poster presentation
The photocatalytic activity of powdered TiO2 (75% anatase, 25% rutile) was tested after the incorporation of the additive in mortars of calcium aluminate cement. Two different CACs were used according to their chemical and mineralogical composition: one of the CAC was a high alumina cement (H-CAC, 70.9% of Al2O3) while the other one was a low alumina cement (L-CAC, 42.0% of Al2O3) with a large amount of ferrite. One batch of the prepared mortars was tested after being subjected to 28 days under a normal curing regime (20ºC and 95% RH). A second batch was tested after a curing regime of 60ºC and 100% RH (for 24 hours) and then 20ºC and 95% RH. This second curing regime intended to induce the conversion reaction, which is responsible for the formation of stable calcium aluminate hydrates at the expense of metastable hydrates. Different properties such as workability, setting time and compressive strength were determined in the tested mortars in order to study the influence of the TiO2 addition. The photocatalytic effect was assessed by means of the NOx abatement under UV irradiation. The TiO2-H-CAC mortars were found excellent systems to decrease NO2 concentrations in connection with the more abundant presence of aluminates. The better NO2 retention improved the NOx removal. An chemical interaction between ferrite and TiO2 was suggested to take place in the L-CAC mortars as evidenced by XRD, SEM, EDAX and zeta potential analyses. This interaction originated two new iron titanate phases, namely pseudobrookite and, to a lesser extent, ilmenite. The reduced band-gap energy of these compounds compared with that of TiO2 improved the photocatalytic efficiency of L-CAC samples in the visible spectrum, as proved by Methyl Orange degradation tests, conferring a self-cleaning ability to the TiO2-bearing iron-reach L-CAC under visible illumination.

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