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Open AccessArticle

Characterization of Photoactive Fe-TiO2 Lime Coatings for Building Protection: The Role of Iron Content

1
School of Architecture, Technical University of Crete, Polytechnioupolis, Akrotiri, 73100 Chania, Crete, Greece
2
School of Mineral Resources Engineering, Technical University of Crete, Polytechnioupolis, Akrotiri, 73100 Chania, Crete, Greece
*
Authors to whom correspondence should be addressed.
Materials 2019, 12(11), 1847; https://doi.org/10.3390/ma12111847
Received: 2 May 2019 / Revised: 30 May 2019 / Accepted: 4 June 2019 / Published: 6 June 2019
(This article belongs to the Special Issue Self-Cleaning Surfaces)
Iron-doped TiO2 nanoparticles, ranging in Fe concentrations from 0.05 up to 1.00% w/w, were synthesized through a simple sol-gel method. Fourier-transform infrared spectroscopy (FTIR), X-ray powder diffraction (XRD), Ultraviolet-Visible (UV-Vis) spectroscopy, nitrogen adsorption−desorption isotherms, X-ray photoelectron spectroscopy (XPS), and X-ray absorption near-edge structure spectroscopy (XANES) were used to characterize the synthesized nanoparticles. The characterization of the Fe-doped TiO2 nanoparticles revealed the predominant presence of anatase crystalline form, as well as the incorporation of the Fe3+ ions into the crystal lattice of TiO2. The photocatalytic assessment of the Fe-doped TiO2 nanoparticles indicated that the low iron doping titania (0.05 and 0.10% w/w) have a positive effect on the photocatalytic degradation of Methyl Orange under visible radiation. Moreover, FTIR monitoring of calcium hydroxide pastes enriched with low Fe-doped TiO2 revealed enhancement of carbonation at both early and later stages. Improved photocatalytic performance and increased lime carbonation, observed in lime coatings with low Fe-doped TiO2 admixtures, established them as invaluable contributors to the protection of the built environment. View Full-Text
Keywords: TiO2; Fe-doped TiO2; photocatalytic activity; Fe content; visible light; lime and Fe-TiO2 coating; self-cleaning; carbonation TiO2; Fe-doped TiO2; photocatalytic activity; Fe content; visible light; lime and Fe-TiO2 coating; self-cleaning; carbonation
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Kapridaki, C.; Xynidis, N.; Vazgiouraki, E.; Kallithrakas-Kontos, N.; Maravelaki-Kalaitzaki, P. Characterization of Photoactive Fe-TiO2 Lime Coatings for Building Protection: The Role of Iron Content. Materials 2019, 12, 1847.

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