#4381. Titania-silica Composite with Photocatalytic Properties and Its Application on Brazilian Granite and Sandstone

October 2026publication date
Proposal available till 10-07-2025
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Journal’s subject area:
Visual Arts and Performing Arts;
Conservation;
Architecture;
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Abstract:
The aim of the study described in this article was to evaluate a product containing titania (titanium dioxide, TiO2) applied on stones — particularly two types used at Brazilian stone-built heritage sites — that have been exposed to weathering and anthropogenic activities. This product was prepared by producing a suspension of TiO2 at two concentrations (1% and 4% w/v) with tetraethyl orthosilicate (TEOS) in the presence of n-octylamine as surfactant. The characteristics of the TiO2 were then observed by scanning electron microscopy (SEM), Brunauer-Emmett-Teller (BET) surface-area measurements, particle-size distribution analysis (CILAS) and X-ray diffraction. When applied on Itaquera granite, the 1% TiO2 (w/v) concentration proved to be an appropriate treatment, as it demonstrated better thermal shock resistance, photocatalytic activity, porosity maintenance, and global colour when compared to the 4% concentration.
Keywords:
Architectural heritage; Itaquera granite; Itarare sandstone; photocatalysis; self-cleaning surfaces; stone conservation; Tio2-Teos composite

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