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首页> 外文期刊>Building and Environment >Field performances of nanosized TiO_2 coated limestone for a self-cleaning building surface in an urban environment
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Field performances of nanosized TiO_2 coated limestone for a self-cleaning building surface in an urban environment

机译：纳米TiO_2涂层石灰石在城市环境中自清洁建筑表面的现场性能

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Over the last few years, photocatalytic titanium dioxide coatings have been explored in laboratory conditions to create building materials with self-cleaning and depolluting abilities. Assessing the performances of the photocatalytic surfaces under real conditions may provide basic knowledge to evaluate the potential of real applications of TiO2 coatings in buildings.In this study, the performance of photocatalytic limestone surfaces obtained through coating with water dispersed TiO2 nanoparticles were investigated in an urban environment. Coated and uncoated samples were exposed to an urban site for one year. Before the exposure and periodically afterwards, optical microscopy observations, colour and contact angle measurements were performed on the sample surface. At the end of the exposure period, samples underwent a capillary water absorption test and self-cleaning efficiency was evaluated by a Rhodamine B photodegradation test. Ti and soluble fraction amounts on the sample surfaces were determined by X-ray Fluorescence (XRF) and ion chromatography, respectively. The overall results showed the TiO2 coating was better able to preserve the surface colour properties early after exposure. After eight months, this effect was lost and the self-cleaning efficiency was reduced to negligible final rates. No clear wettability results and no meaningful capillary behaviour were recorded. A decrease of the photocatalytic activity was due to both partial titania loss and deactivation phenomena. The role of soluble salt ions either adsorbed from the environment or produced by the photocatalytic abatement of pollutants was recognized in the deactivation of the photocatalysts and their accumulation deserves attention for possible stone damage risk implications.
机译：在过去的几年中，已经在实验室条件下对光催化二氧化钛涂料进行了研究，以创建具有自清洁和去污能力的建筑材料。评估真实条件下光催化表面的性能可能为评估TiO2涂料在建筑物中的实际应用潜力提供基础知识。在这项研究中，研究了通过用水分散的TiO2纳米颗粒进行涂层获得的光催化石灰石表面的性能。环境。涂层样品和未涂层样品在市区暴露一年。在曝光之前和之后定期进行光学显微镜观察，颜色和接触角测量。在暴露期结束时，对样品进行毛细管吸水测试，并通过若丹明B光降解测试评估自清洁效率。样品表面上的Ti和可溶级分的量分别通过X射线荧光（XRF）和离子色谱法确定。总体结果表明，TiO2涂层在曝光后早期能够更好地保留表面颜色性能。八个月后，这种效果消失了，自清洁效率降低到可以忽略的最终比率。没有明显的润湿性结果，也没有有意义的毛细管行为记录。光催化活性的降低是由于部分二氧化钛损失和失活现象造成的。从环境中吸收或通过光催化消除污染物而产生的可溶性盐离子的作用已在光催化剂的失活中得到公认，并且它们的积累值得关注，可能对石材造成损坏的风险产生影响。

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