Photocatalytic hydroxyapatite-titania nanocomposites for preventive conservation of marble

Sassoni, Enrico ; D'Amen, Eros ; Roveri, Norberto ; Scherer, George W. ; Franzoni, Elisa (2018) Photocatalytic hydroxyapatite-titania nanocomposites for preventive conservation of marble. DOI 10.1088/1757-899X/364/1/012073. In: Florence Heri-Tech – The Future of Heritage Science and Technologies. IOP Publishing, pp. 1-8. In: IOP Conference Series: Materials Science and Engineering
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Abstract

Soiling of external surfaces is an increasing issue for conservation of architectural heritage. Providing architectural surfaces with self-cleaning ability is one of the most promising routes of preventive conservation. To this aim, several methods have been proposed in the literature, based on the use of photocatalytic TiO2 nanoparticles, either directly applied onto the surfaces or incorporated in protective coatings. However, when nano-TiO2 is directly applied onto architectural surfaces, the particles are easily removed by rain. When TiO2 is incorporated in polymeric coatings, durability issues arise as well, because the photoactivity of TiO2 nanoparticles can promote degradation of the polymer. Here, we present an innovative alternative method, based on combination of TiO2 nanoparticles and hydroxyapatite (HAP). The incorporation of nano-TiO2 into an HAP coating protects the nanoparticles from leaching by rain, thanks to the chemical bonding between TiO2 and HAP, without diminishing their photoactivity. As a result, marble treated with HAP-TiO2 composites exhibits high self-cleaning ability and high durability, with results superior to those achieve by direct application of nano-TiO2 onto the surface, as frequently performed on site.

Abstract
Document type
Book Section
Creators
CreatorsAffiliationORCID
Sassoni, EnricoUniversity of Bologna0000-0003-0716-510X
D'Amen, ErosChemical Center S.r.l.
Roveri, NorbertoChemical Center S.r.l.
Scherer, George W.Princeton University
Franzoni, ElisaUniversity of Bologna
Keywords
Durability; Hydroxyapatite; Marble; Nanoparticles; Protective coatings; Rain
Subjects
DOI
Deposit date
07 Sep 2018 10:24
Last modified
07 Sep 2018 10:24
Project name
HAP4MARBLE - Multi-functionalization of hydroxyapatite for restoration and preventive conservation of marble artworks
Funding program
EC - H2020
URI

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