Measurement of benzene, toluene, ethylbenzene and o-xylene gas phase photodegradation by titanium dioxide dispersed in cementitious materials using a mixed flow reactor

By A. Strini, S. Cassese, L. Schiavi. 2005

198 citations recorded by the source corpus.

A method for the measurement of the photocatalytic activity of titanium dioxide dispersed in cementitious building materials was developed as part of the European Project Photocatalytic Innovative Coverings Applications for Depollution Assessment (PICADA). The method is based on a specially designed stirred flow reactor. It is aimed at the measuring of the photodegradation of organic compounds in air at ppb level at the surface of photocatalytic materials. The use of an actively mixed flow reactor results in a uniform concentration of reactants at the catalytic material surface at high conversion factors which also allows to measure the photocatalytic activity bypassing the limitations imposed by the concentration gradients of unmixed flow reactors. A titanium dioxide modified cementitious material was studied by applying the described method, with a benzene, toluene, ethylbenzene and o-xylene (BTEX) mixture used as organic pollutant standard. The pollutant concentrations and irradiation levels used throughout the study were comparable to those that can be found under real ambient conditions. The effects of variation of pollutant concentration, irradiation level and titanium dioxide percentage in the cementitious materials were studied. The photocatalytic activity of a pure titanium dioxide film was also measured to stand as reference benchmark. The cementitious photocatalytic material showed an interesting photocatalytic activity with linear dependence versus pollutant air concentration and irradiance. On the other hand the variation of titanium dioxide content (from 0 to 5.6% as dry powder) in the cementitious mixture showed a non-linear relationship denoting a relative loss of efficiency at higher concentrations.

Subfields: Renewable Energy, Sustainability and the Environment, Water Science and Technology

View Paper: https://www.semanticscholar.org/paper/c73c947596ce873150aceb5f51aea5609ad67aaf

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Citations in the corpus

Volatile organic compounds in indoor environment and photocatalytic oxidation: state of the art. (2007, background): “However, the photocatalytic activity observed for the pure titanium dioxide sample was higher than cementitious samples with 3% catalyst content (Strini et al., 2005).”
Nanotechnology: Advantages and drawbacks in the field of construction and building materials (2011, background): “[46] mentioned that TiO2 thin films possess a photocatalytic capacity which is 3–10 times higher than for TiO2 cementitious composites.”