Rhodamine B discolouration on TiO 2 in the cement environment: A look at fundamental aspects of the self-cleaning effect in concretes

A. Folli*, U. H. Jakobsen, G. L. Guerrini, D. E. Macphee

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

43 Citations (Scopus)

Abstract

The present work addresses the photocatalytic properties of two commercial titanias for application in concrete technology. A microsized, m-TiO 2 (average particle size 153.7 nm ± 48.1 nm) and a nanosized, n-TiO2 (average particle size 18.4 nm ± 5.0 nm) have been tested. Cement paste samples (CEMI 52.5 cement, w/c=0.4) containing both photocatalysts have been evaluated based on Rhodamine B (RhB) discolouration under U.V. light, a standard test for self-cleaning cementitious materials. Experimental data are discussed in relation to photocatalyst properties (e.g.: particle size), dye adsorption and degradation characteristics. The influence of the chemical environment on photocatalyst performance and its impact on applications in construction concrete are also discussed. © 2009 Science & Technology Network, Inc.

Original languageEnglish
Pages (from-to)126-133
Number of pages8
JournalJournal of Advanced Oxidation Technologies
Volume12
Issue number1
DOIs
Publication statusPublished - Jan 2009

Keywords

  • visible-light irradiation
  • titanium-dioxide
  • water-treatment
  • Monte-Carlo
  • degradation
  • dispersions
  • adsorption
  • surfaces
  • forces
  • layers

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