Self-cleaning building materials: The multifaceted effects of titanium dioxide

被引：27
作者：
Paolini, Riccardo [1 ,2 ]
Borroni, Dario [3 ]
Pedeferri, MariaPia [3 ]
Diamanti, Maria Vittoria [3 ]
机构：
[1] Politecn Milan, Dept Architecture Built Environm & Construct Engn, Milan, Italy
[2] Univ New South Wales, UNSW Built Environm, Sydney, NSW, Australia
[3] Politecn Milan, Dept Chem Mat & Chem Engn Giulio Natta, Via Mancinelli 7, I-20131 Milan, Italy
来源：
CONSTRUCTION AND BUILDING MATERIALS | 2018年 / 182卷
关键词：
Acid treatment; Photocatalysis; P25; Self-cleaning; Solar reflectance; TiO2; HETEROGENEOUS PHOTOCATALYSIS; TIO2; PHOTOCATALYSIS; LIGHT IRRADIATION; RHODAMINE-B; REFLECTANCE; DEGRADATION; PERFORMANCE; SURFACES; COATINGS; MORTARS;
D O I：
10.1016/j.conbuildmat.2018.06.047
中图分类号：
TU [建筑科学];
学科分类号：
0813 ;
摘要：
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 2500 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. (C) 2018 Elsevier Ltd. All rights reserved.
引用
收藏
页码：126 / 133
页数：8
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