Titanium dioxide containing cementitious materials: characterization and air cleaning potential

Author(s): Aníbal Maury, Nele De Belie, Kristof Demeestere, Tapio Mäntylä
Paper category : conference
Book title: International RILEM Symposium on Photocatalysis, Environment and Construction Materials - TDP 2007
Editor(s): P. Baglioni and L. Casssar
Print-ISBN: 978-2-35158-056-1
e-ISBN: 978-2-35158-057-8
Publisher: RILEM Publications SARL
Publication year: 2007
Pages: 227 - 234
Total Pages: 8
Language: English

Abstract: In this work, promising results are presented concerning the air purification potential of titanium dioxide loaded cementitious materials.
In a first part of research, a dip-coating technology, based on the submersion of four different cementitious substrates in a suspension of titanium dioxide and ethanol, has been developed. The weather resistance of each sample was evaluated and showed to be function of the TiO2 particle size, and the pore size (distribution) of the substrates. The chemical composition of the substrate surfaces was analyzed with SEM-EDAX; the roughness was determined using a laser profilometer; and a mercury porosimeter was used for determination of the porosity.
In a second stage of research, another four cement based materials with different finishing techniques at their surfaces were loaded with TiO2 using the dip-coating technique developed in the first part of research next to a sol-gel method. The substrate surfaces were characterized in terms of porosity and roughness, using vacuum saturation and a laser profilometer.
Moreover, the potential of both dip-coated and sol-gel prepared TiO2 samples towards air purification were evaluated on lab-scale. Toluene removal efficiencies up to 86% were observed for the dip-coated samples, at a toluene inlet concentration of 12.3±1.2 ppmv, an air relative humidity of 41±6%, and a gas residence time of about 3 minutes. In contrast, no significant toluene removal was observed with the sol-gel prepared TiO2 samples.

Online publication: 2011-07-01
Publication type : full_text
Public price (Euros): 0.00