Durable Photocatalytic Thin Coatings for Road Applications

In this study, 6 different coatings have been developed as photocatalytic coatings based on TiO₂, which can be applied to concrete for road applications. The goal of these coatings is to degrade pollutants such as nitrogen oxides and volatile organic compounds emitted by road transport. The coatings are synthesized by sol-gel process in organic or water solvent or by a functionalization technique with hydroxybenzoic acid on commercial TiO₂ nanoparticles (P25). These suspensions are deposited by dip-coating or spray-coating on three different concrete substrates: pavement blocks, brushed or exposed aggregates road concrete. For each process, particular attention has been paid to the development of TiO₂ synthesis that will be easily produced on a larger scale. The samples are characterized with photocatalytic test on NOx degradation, mechanical resistance test and resistance to freeze-thaw cycles in presence of de-icing salts. Except from the samples resulting from the sol-gel organic route, all other samples show a NOx degradation between 10 and 45%. From resistance point of view, the best coating is the TiO₂ P25/E coating synthesized by functionalization of P25 nanoparticles. Results highlight that anatase TiO₂ is well present at the surface of the sample and an optimal TiO₂ loading exists for this coating. The TiO₂ P25/E coating shows promising properties for road applications.

Language

  • English

Media Info

Subject/Index Terms

Filing Info

  • Accession Number: 01708952
  • Record Type: Publication
  • Files: TRIS
  • Created Date: May 4 2019 3:10PM