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首页> 外文期刊>Building and Environment >Titanium dioxide based nanotreatments to inhibit microalgal fouling on building stone surfaces
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Titanium dioxide based nanotreatments to inhibit microalgal fouling on building stone surfaces

机译：基于二氧化钛的纳米处理可抑制建筑石材表面的微藻类结垢

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Stones are among the most widespread traditional materials used in construction for both structural and ornamental purposes, especially for Cultural Heritage monuments. Stone materials both natural and man-made are quite prone to algal colonisation that may cause biodeterioration of building materials by both affecting the aesthetic of their surfaces and compromising their entirety and durability. Nano technology has been recently used in both Cultural Heritage and construction industry to improve the preservation of building surfaces and titanium dioxide (TiO2) in its nanometric form is among the most used and promising nanotechnological material. This study investigated the biocidal ability of photocatalytic TiO2-based nanocompounds (also in combination with Ag and Cu nanoparticles) applied on travertine surfaces by spray-coating in order to limit or inhibit algal fouling. The aesthetic compatibility with stone has been assessed using colorimetry. Algal fouling was simulated by means of an accelerated water run-off test under artificial solar light and weak UV irradiation. Antialgal capability of metallic nanotreatments was evaluated through the combination of different parameters monitored for 9 weeks: human perception of the colour change, reflectance reduction and measurement of area colonised by algae. Nanoproducts had a limited impact on surface colour of the substrate after application making them suitable for restoration. Even though photocatalysis prevented algal fouling only partially, some nanotreatments moderately reduced the bioreceptivity of coated stones mainly limiting the area colonised by microalgae. Further investigations are necessary, since the conditions used to accelerate algal growth may affect greatly the biocidal efficiency of nanotreatments. (C) 2016 Elsevier Ltd. All rights reserved.
机译：石头是建筑中用于结构和装饰目的的最广泛的传统材料之一，尤其是用于文化遗产的古迹。天然和人造石材均很容易发生藻类定植，这既会影响建筑材料表面的美观，又会损害其整体性和耐用性，从而导致建筑材料的生物降解。纳米技术最近已在文化遗产和建筑行业中用于改善建筑表面的保存，其纳米形式的二氧化钛（TiO2）是最常用和最有前途的纳米技术材料之一。这项研究研究了通过喷涂法将石灰岩表面上光催化的TiO2基纳米化合物（也与Ag和Cu纳米粒子结合使用）的杀生物能力，以限制或抑制藻类结垢。使用比色法评估了与石材的美学相容性。通过在人工太阳光和弱紫外线照射下的加速水径流试验模拟藻类结垢。通过监测9周的不同参数的组合来评估金属纳米处理的抗藻能力：人类对颜色变化的感知，反射率的降低以及藻类定殖面积的测量。纳米产品在施涂后对基材表面颜色的影响有限，使其适合于修复。即使光催化仅部分阻止了藻类结垢，但某些纳米处理仍会适度降低被覆石块的生物接受度，这主要限制了微藻所定居的区域。由于用于加速藻类生长的条件可能会大大影响纳米处理的杀生物效率，因此有必要进行进一步的研究。 （C）2016 Elsevier Ltd.保留所有权利。

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