Development of TiO 2 -CaCO 3 Based Composites as an Affordable Building Material for the Photocatalytic Abatement of Hazardous NO x from the Environment.

This study explores the depollution activity of a photocatalytic cementitious composite comprising various compositions of n-TiO 2 and CaCO 3 . The photocatalytic activity of the CaCO 3 -TiO 2 composite material is assessed for the aqueous photodegradation efficiency of MB dye solution and NO x under UV light exposure. The catalyst CaCO 3 -TiO 2 exhibits the importance of an optimal balance between CaCO 3 and n-TiO 2 for the highest NO x removal of 60% and MB dye removal of 74.6%. The observed trends in the photodegradation of NO x removal efficiencies suggest a complex interplay between CaCO 3 and TiO 2 content in the CaCO 3 -n-TiO 2 composite catalysts. This pollutant removal efficiency is attributed to the synergistic effect between CaCO 3 and n-TiO 2, where a higher percentage of n-TiO 2 appeared to enhance the photocatalytic activity. It is recommended that CaCO 3 -TiO 2 photocatalysts are effectiveness in water and air purification, as well as for being cost-effective construction materials.