The Influence of Selected Material Variables of Photocatalytic Cementitious Composites on the Self-Cleaning Properties and Air Purification Efficiency from NOx Pollutants

This work aimed to investigate the influence of selected material variables on self-cleaning and air purification efficiency in NOx pollutants cement-based photocatalytic composites. Tests were performed cement mortars, with seven independent considered: mass ratio between quartz powder sand, water ratio, total amount photocatalysts (two different types), content nanoparticulate silica, percentage replacing part cement, two sands fine granulation. Photocatalytic cementitious materials had their properties tested via methods (spectrophotometry—the degradation rhodamine B under UVA irradiation, change contact angle—via a goniometer). Air reaction chamber visible light at low irradiance (0.2 W/m2 for UVA, 150 visible). It was found that TiO2 sand most influential within ranges variability, being least significant variable properties.