Photocatalytic cement-based materials: Comparison of nitrogen oxides and toluene removal potentials

Abstract Using cement-based building materials as a matrix for nano-photocatalysts is an important development for the large scale application of photocatalytic technologies. Air pollution mitigation and self-cleaning surface are two major applications of photocatalytic building materials. In this study, a comparison was made to evaluate the performance of TiO 2 modified concrete surface layers for NO x and VOC degradation. The self-cleaning performance of TiO 2 modified self-compacting mortars (SCM) developed for decorative applications was also evaluated. The results show that the photocatalytic conversion of toluene by the TiO 2 modified surface layer was not detected, although NO x could be effectively removed under the same conditions. The presence of toluene did not influence the NO x removal process. TiO 2 modified SCM were found to be effective in the discoloration of rhodamine B under UV and strong halogen light irradiation. The level of adsorption of the air contaminants onto the active sites of the cement-TiO 2 composite was identified to be the key factor determining the subsequent photocatalytic efficiency.

[1]  Hjh Jos Brouwers,et al.  NOx photocatalytic degradation employing concrete pavement containing titanium dioxide , 2010 .

[2]  T. Salthammer,et al.  Surface-catalysed reactions on pollutant-removing building products for indoor use. , 2009, Chemosphere.

[3]  Adam Heller,et al.  Photooxidative self-cleaning transparent titanium dioxide films on glass , 1995 .

[4]  A. Stern.  Fundamentals of air pollution , 1973 .

[5]  Jun Chen,et al.  Photocatalytic cementitious materials: influence of the microstructure of cement paste on photocatalytic pollution degradation. , 2009, Environmental science & technology.

[6]  Mohamad Sleiman,et al.  Photocatalytic oxidation of toluene at indoor air levels (ppbv): Towards a better assessment of conversion, reaction intermediates and mineralization , 2009 .

[7]  Anita Rachel,et al.  Comparison of photocatalytic efficiencies of TiO2 in suspended and immobilised form for the photocatalytic degradation of nitrobenzenesulfonic acids , 2002 .

[8]  Maria Vittoria Diamanti,et al.  Characterization of photocatalytic and superhydrophilic properties of mortars containing titanium dioxide , 2008 .

[9]  Hjh Jos Brouwers,et al.  Photocatalytic degradation of air pollutants - From modeling to large scale application , 2010 .

[10]  S. Matsuzawa,et al.  Transparent Micrometer-Thick TiO2 Films on SiO2-Coated Glass Prepared by Repeated Dip-Coating/Calcination: Characteristics and Photocatalytic Activities for Removing Acetaldehyde or Toluene in Air , 2007 .

[11]  Jun Chen,et al.  Photocatalytic activity of titanium dioxide modified concrete materials - influence of utilizing recycled glass cullets as aggregates. , 2009, Journal of environmental management.

[12]  Surface properties of doped and undoped TiO2 thin films deposited by magnetron sputtering , 2009 .

[13]  N. Serpone,et al.  Photocatalysis: Fundamentals and Applications , 1989 .

[14]  N. Moussiopoulos,et al.  Photocatalytic degradation of NOx in a pilot street canyon configuration using TiO2-mortar panels , 2007, Environmental monitoring and assessment.

[15]  Armand Masion,et al.  Structural degradation at the surface of a TiO(2)-based nanomaterial used in cosmetics. , 2010, Environmental science & technology.

[16]  S. Ardizzone,et al.  Photocatalytic degradation of toluene in the gas phase: relationship between surface species and catalyst features. , 2008, Environmental science & technology.

[17]  Louay N. Mohammad,et al.  Evaluation of the durability of titanium dioxide photocatalyst coating for concrete pavement , 2010 .

[18]  Nele De Belie,et al.  Titanium dioxide coated cementitious materials for air purifying purposes: Preparation, characterization and toluene removal potential , 2010 .

[19]  Francois Olive,et al.  TiO2-containing cement pastes and mortars: Measurements of the photocatalytic efficiency using a rhodamine B-based colourimetric test , 2009 .

[20]  Pierre Pichat,et al.  State of the art and perspectives on materials and applications of photocatalysis over TiO2 , 2005 .

[21]  A. Fujishima,et al.  TiO2 photocatalysis and related surface phenomena , 2008 .

[22]  Z. Bai,et al.  Influence of relative humidity on the photocatalytic oxidation (PCO) of toluene by TiO2 loaded on activated carbon fibers: PCO rate and intermediates accumulation , 2008 .

[23]  Roger Atkinson,et al.  Evaluated kinetic and photochemical data for atmospheric chemistry: Volume I - gas phase reaxtions of Ox, HOx, NOx and SOx species , 2004 .

[24]  Joonas Auvinen,et al.  The influence of photocatalytic interior paints on indoor air quality , 2008 .

[25]  G Götz Hüsken,et al.  Experimental study of photocatalytic concrete products for air purification , 2009 .

[26]  M. Ferraris,et al.  Development of titania coatings on glass foams , 2009 .

[27]  Alberto Strini,et al.  Measurement of benzene, toluene, ethylbenzene and o-xylene gas phase photodegradation by titanium dioxide dispersed in cementitious materials using a mixed flow reactor , 2005 .

[28]  Hidekazu Tsukamoto,et al.  Kinetic studies of oxidation of ethylene over a TiO2 photocatalyst , 1999 .

[29]  P. Cloirec,et al.  Kinetic study of ketones photocatalytic oxidation in gas phase using TiO2-containing paper: effect of water vapor , 2004 .

[30]  Y. Nosaka,et al.  Design and evaluation of photocatalytic micro-channel reactors using TiO2-coated porous ceramics , 2006 .

[31]  R. Derwent,et al.  Photochemical ozone creation potentials for a large number of reactive hydrocarbons under European conditions , 1996 .