Cementitious materials with air-purifying and self-cleaning properties

(finished project researcher: Anibal Maury Ramirez, for more information contact prof. dr. ir. Nele De Belie)

TiO2 coatings can be applied on concrete in order to obtain materials with both self-cleaning (algal fouling removal) and air-purifying (toluene removal) properties. These novel material properties certainly decrease maintenance activities on building façades while improving air quality in urban environments. In this project, four different aspects have been investigated. These are the effects of
(1) substrate characteristics (roughness and porosity),
(2) TiO2 loading technique: direct addition of TiO2 to the concrete mass versus different coating techniques as e.g. direct TiO2 synthesis via liquid flame spraying, low and high temperature sol-gel synthesis or application of commercially available TiO2 nanoparticles via dip-coating or vacuum saturation,
(3) environmental weathering,
(4) pollutant concentration and contact time on the materials performance towards the defined purposes. concrete and environment 14

Schematic representation of the mechanism of air-purifying cementitious materials containing TiO2.


concrete and environment 15

Schematic representation of the self-cleaning mechanism of cementitious materials containing TiO2. This scheme does not contain the direct degradation of micro-organisms such as algae.