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Experimental study of photocatalytic concrete products for air purification

机译：用于空气净化的光催化混凝土产品的实验研究

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Air quality in inner-city areas is a topic which receives much attention nowadays but in the coming years, the overall interest on this topic will become even bigger. One major concern is caused by the reduction of the limiting values given by the European Council Directive 1999/30/EC [Relating to limit values for sulphur dioxide, nitrogen dioxide and oxides of nitrogen, particulate matter and lead in ambient air. Official Journal of the European Communities 1999, L 163/41-60] and increasing traffic rates especially for diesel powered passenger cars and freight vehicles.rnA promising approach for solving the problem of nitrogen oxides (NO_X) is the photochemical conversion of nitrogen oxides to low concentrated nitrates due to heterogeneous photocatalytic oxidation (PCO) using titanium dioxide (TiO_2) as photocatalyst. A variety of products containing TiO_2 are already available on the European market and their working mechanism under laboratory conditions is proven. However, there is still a lack of transforming the experimental results obtained under laboratory conditions to practical applications considering real world conditions.rnThis paper presents the research conducted on photocatalytic concrete products with respect to the evaluation of air-purifying properties. The degradation process of nitric oxide (NO) under laboratory conditions is studied using a test setup for measuring the performance of photocatalytic active concrete products. The test setup uses the UV-A induced degradation of NO and is oriented on the ISO standard ISO 22197-1:2007. Besides the introduction of the test setup, a uniform measuring procedure is presented to the reader which allows for an evaluation and direct comparison of the performance of photocatalytic active concrete products. This kind of direct comparison was not possible so far. Furthermore, the results of a comparative study on varying photocatalytic concrete products of the European market will be discussed.
机译：如今，市区内的空气质量是一个备受关注的话题，但在未来几年中，对该主题的整体兴趣将越来越大。一个主要的担忧是由于降低了欧洲理事会指令1999/30 / EC给出的极限值[与环境空气中的二氧化硫，二氧化氮和氮氧化物，颗粒物和铅的极限值有关。欧洲共同体官方公报，1999年，L 163 / 41-60]，并且特别是对于柴油动力乘用车和货运车辆，提高了交通流量。解决氮氧化物（NO_X）问题的一种有前途的方法是将氮氧化物光化学转化为氮氧化物。低浓度的硝酸盐，这是由于使用二氧化钛（TiO_2）作为光催化剂的非均相光催化氧化（PCO）。在欧洲市场上已经可以买到多种含TiO_2的产品，并且它们在实验室条件下的工作机理得到了证明。然而，考虑到实际条件，仍然缺乏将实验室条件下获得的实验结果转化为实际应用的方法。本文介绍了光催化混凝土产品在评估空气净化性能方面的研究。使用用于测量光催化活性混凝土产品性能的测试装置，研究了实验室条件下一氧化氮（NO）的降解过程。该测试装置使用UV-A诱导的NO降解，并以ISO标准ISO 22197-1：2007为导向。除了介绍测试装置外，还向读者介绍了一个统一的测量程序，该程序可以对光催化活性混凝土产品的性能进行评估和直接比较。到目前为止，这种直接比较是不可能的。此外，还将讨论对欧洲市场上各种光催化混凝土产品进行比较研究的结果。

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