| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 6712089 | Construction and Building Materials | 2018 | 8 Pages |
Abstract
The physical integrity and photocatalytic performance of titanium dioxide (TiO2) deteriorate with aging. Here we propose a pre-treatment with nitric or sulfuric acid of commercial TiO2 nanopowders used in coating, mortars, or paints. The diffuse reflectance is increased between 1500 and 2500â¯nm by 0.04 and 0.06, respectively, with nitric and sulfuric acid (unaffected by neutralization). Nitric acid causes a decrease in crystallinity and photocatalytic activity, which drops by almost 20%; this drawback is prevented by post-treatment neutralization, which allows to recover initial photocatalytic efficiency and even increase it. Treatment with sulfuric acid shows no significant effect on photoactivity, instead.
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Authors
Riccardo Paolini, Dario Borroni, MariaPia Pedeferri, Maria Vittoria Diamanti,