Environmental performance of nano-structured Ca(OH)2/TiO2 photocatalytic coatings for buildings
Environmental performance of nano-structured Ca(OH)2/TiO2 photocatalytic coatings for buildings
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DOI：
10.1016/j.buildenv.2015.05.028
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发表时间：
2015-10-01
影响因子：
7.4
通讯作者：
Ball, Richard J.
中科院分区：
文献类型：
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作者：
Nuno, Manuel;Pesce, Giovanni L.;Ball, Richard J.
本文介绍了一种混合相涂料（光催化纳米石灰）的环境性能，由胶体纳米结构的氢氧化钙在乙醇（纳米石灰）结合二氧化钛。虽然纳米石灰在文化遗产领域中用作固化剂，而二氧化钛在建筑行业中用作自清洁涂料和环境污染控制的光催化材料，但这两种材料通常单独使用。我们在本文中报告的方法，联合收割机这两种材料的光催化纳米石灰涂料的发展。评估了二氧化钛对纳米石灰碳酸化的光催化作用及其对污染环境中降解过程的影响。将25 g/l的纳米石灰在乙醇和7.4%wt/vol二氧化钛中的悬浮液施加到浴石的样品上。为了比较，仅用纳米石灰处理另外的样本。试样在30%相对湿度（RH）下暴露于氮和硫的氧化物中120 h。暴露在紫外线和日光下进行。曝光后，二氧化钛对纳米石灰的碳酸化和降解过程的影响进行了研究，使用扫描电子显微镜（SEM），能量色散X射线分析（EDS）和X射线光电子能谱（XPS）。结果进行了评估，考虑到两种氧化物在水中的溶解过程，并使用PHREEQC建模。纳米石灰和纳米石灰光催化涂层被证明是促进SO2的反应。来自光催化纳米石灰制剂的结果表明，它们可以通过形成牺牲层来降低大气污染物水平。这种涂料有可能防止对石灰石外墙的进一步破坏，并可应用于污染对历史建筑有害的城市。(C)2015年，作者。由爱思唯尔有限公司出版。这是一篇开放获取的文章，使用CC BY许可证（http：//creativecommons.org/licenses/by/4.0/）。
This paper describes the environmental performance of a mixed phase coating (photocatalytic nanolime) manufactured from a colloidal nano-structured calcium hydroxide in alcohol (nanolime) combined with titanium dioxide. While nanolime is used as a consolidant in the field of cultural heritage and titanium dioxide is used as a photocatalytic material for self-cleaning coatings and environmental pollution control within the construction industry both materials are often used separately. We report in this paper an approach to combine both materials for the development of a photocatalytic nanolime coating. The photocatalytic effect of titanium dioxide on the carbonation of nanolime and its influence on the degradation processes in polluted environments is assessed. A suspension of 25 g/l of nanolime in ethanol and 7.4% wt/vol titanium dioxide was applied to specimens of Bath stone. For comparison, additional specimens were treated only with the nanolime. The specimens were exposed to oxides of nitrogen and sulphur under 30% relative humidity (RH) for 120 h. Exposure was carried out under both, UV and daylight. After exposure, the effect of titanium dioxide on the carbonation of nanolime and on the degradation processes was investigated using scanning electron microscopy (SEM), energy dispersive Xray analysis (EDS) and X-ray photo electron spectroscopy (XPS). Results were evaluated considering the dissolution processes of the two oxides in water and modelled using PHREEQC. Nanolime and the photocatalytic nanolime coatings were shown to promote the reaction of SO2. Results from the photocatalytic nanolime formulation suggest they could be used to reduce atmospheric pollutant levels through creation of a sacrificial layer. Such coatings have the potential to prevent further damage to limestone facades and could be applied in cities where pollution is detrimental to historic buildings. (C) 2015 The Authors. Published by Elsevier Ltd. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).