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Mechanisms limiting the release of TiO 2 nanomaterials during photocatalytic cement alteration: the role of surface charge and porous network morphology

Abstract : Nanomaterials have been widely used in a wide range of manufactured products in order to improve / add new properties. Photocatalytic cement maintains clean and white wall fronts and also provide interesting air pollution-reducing properties due to photocatalytic activity of incorporated TiO2-NMs. However, despite these environmental benefits, there is evidence of the release of TiO2-NMs during cement use. Therefore, it is crucial to understand the parameters controlling TiO2-NMs release. Zêta potentials of TiO2-NMs were investigated from the unaltered core to the cement altered surface using simulated cement pore waters. The mineralogy and chemical composition of the altered layer were investigated using X-ray Diffraction (XRD) and micro X-ray fluorescence spectroscopy (micro-XRF). Finally, pore network morphology was fully analyzed using X-ray computed tomography at both micro and nano-scales (micro and nano-CT) and quantified using 3D morphological software (i-Morph). This study provides evidence that the TiO2-NMs release comes from a very thin “active surface layer” (thickness less than 20 µm) where both cement surface chemistry and the pore network appears to be favorable for the TiO2-NMs diffusion. The pore volume connected to the surface with a throat size ≥1016 nm appears to control and be used as a predictor for TiO2-NMs release.
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Submitted on : Tuesday, March 12, 2019 - 2:40:28 PM
Last modification on : Wednesday, April 6, 2022 - 1:56:02 PM
Long-term archiving on: : Thursday, June 13, 2019 - 2:36:12 PM

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Distributed under a Creative Commons Attribution - NonCommercial 4.0 International License

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  • HAL Id : hal-02051803, version 1

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Nathan Bossa, Perrine Chaurand, Clément Levard, Jérôme Vicente, Daniel Borschneck, et al.. Mechanisms limiting the release of TiO 2 nanomaterials during photocatalytic cement alteration: the role of surface charge and porous network morphology. Environmental science‎.Nano, Royal Society of Chemistry, 2019, 6 (2), pp.624-634. ⟨hal-02051803⟩

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