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Photocatalytic N-doped TiO2 for self-cleaning of limestones

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Abstract.

Nanocrystalline nitrogen-doped TiO2 photocatalysts were applied as surface coatings to three typical Israeli limestones, Maccabim, Halila and Hebron, widely used for historic buildings. Two different N-doped TiO2 sols were synthesised by sol-gel method starting from titanium oxysulfate ( TiOSO4 as Ti precursor: a new N-doped TiO2 coating (N-TiF), obtained in neutral conditions, was developed and compared to a N-doped TiO2 (N-TiA), obtained in acidic medium. XRD and Raman spectroscopy confirm the nanocrystalline nature of N-doped TiO2, mainly in anatase phase, with size ∼ 4 nm as revealed by TEM analysis. Diffuse Reflectance Spectroscopy indicates a red-shift in the absorption spectra for both nanopowders, even if the X-ray Photoelectron spectroscopy results are not conclusive on the state and location of the N doping ions. The self-cleaning efficiency of the two TiO2 coatings was assessed on the three Israeli carbonate stones and compared to commercial TiO2 (Evonik P25) by the photoinduced degradation of two organic dyes (Methyl orange and Rhodamine B) and by following hydrophilicity changes, through static contact angle measurements. The harmlessness of these coatings was confirmed by colorimetric and water capillary absorption measurements.

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Authors and Affiliations

  1. Department of Mathematical, Physical and Computer Sciences, University of Parma, Parco Area delle Scienze 7/a, 43124, Parma, Italy

    Laura Fornasini, Danilo Bersani & Pier Paolo Lottici

  2. Department of Chemistry, Life Sciences and Environmental Sustainability, University of Parma, Parco Area delle Scienze 17/a, 43124, Parma, Italy

    Laura Bergamonti

  3. Department of Applied Science and Technology, Politecnico di Torino, Corso Duca degli Abruzzi, 24, 10129, Torino, Italia

    Federica Bondioli

  4. IMEM-CNR, Parco Area delle Scienze 37/A, 43124, Parma, Italy

    Laura Lazzarini

  5. Department of Chemical Engineering, Technion-Israel Institute of Technology, 32000, Haifa, Israel

    Yaron Paz

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  1. Laura Fornasini
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  2. Laura Bergamonti
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  3. Federica Bondioli
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  7. Pier Paolo Lottici
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Correspondence to Laura Fornasini.

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Fornasini, L., Bergamonti, L., Bondioli, F. et al. Photocatalytic N-doped TiO2 for self-cleaning of limestones. Eur. Phys. J. Plus 134, 539 (2019). https://doi.org/10.1140/epjp/i2019-12981-6

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