Publication
Title
Photocatalytic activity of titanium dioxide nanoparticle coatings applied on autoclaved aerated concrete: Effect of weathering on coating physical characteristics and gaseous toluene removal
Author
Abstract
Autoclaved aerated concrete has been coated by TiO2 nanoparticles through a dip-coating (DC) and a novel vacuum saturation (VS) method to investigate the weathering resistance and gaseous toluene removal potential of both coating types. The effect of intensive weathering – corresponding to a period of about 25 years – on the coating characteristics was studied in terms of TiO2 content, coating thickness and color changes. Toluene removal was investigated in a lab-scale flow-through photoreactor at 24 °C and 52% relative humidity, and results obtained immediately after application of the coatings and after two weathering stages were compared. Weathering of the DC and VS coated samples resulted into a decrease of the coating layer thickness of more than 98%, confirmed by a decline in TiO2 content by more than 99% and 93%, respectively. Surprisingly, toluene removal efficiencies before and after weathering kept constant at about 95% for both coating types, corresponding to an elimination rate of 60–70 mg/(m2 h) at an initial toluene concentration of 15 ppmv and a gas residence time of 3 min. Increasing the toluene load by applying higher toluene inlet concentrations (up to 35 ppmv) and lower gas residence times (1 min) did decrease the toluene removal efficiency to 32–41%, but elimination rates increased up to 214 mg/(m2 h), being a factor of 1.6–4.5 times higher than reported in recent work.
Language
English
Source (journal)
Journal of hazardous materials. - Amsterdam
Publication
Amsterdam : 2012
ISSN
0304-3894
DOI
10.1016/J.JHAZMAT.2011.12.037
Volume/pages
211-212 (2012) , p. 218-225
ISI
000302756100026
Full text (Publisher's DOI)
UAntwerpen
Publication type
Subject
External links
Web of Science
Record
Identifier
Creation 13.10.2023
Last edited 12.02.2024
To cite this reference