Maggos Th, Plassais A, Bartzis J G, Vasilakos Ch, Moussiopoulos N, Bonafous L
Environmental Research Laboratory, INT-RP, NCSR Demokritos, 153 10 Aghia Paraskevi, Athens, Greece.
Environ Monit Assess. 2008 Jan;136(1-3):35-44. doi: 10.1007/s10661-007-9722-2. Epub 2007 Jun 12.
Titanium dioxide is the most important photocatalysts used for purifying applications. If a TiO2- containing material is left outdoors as a form of flat panels, it is activated by sunlight to remove harmful NOx gases during the day. The photocatalytic efficiency of a TiO2-treated mortar for removal of NOx was investigated in the frame of this work. For this purpose a fully equipped monitoring system was designed at a pilot site. This system allows the in situ evaluation of the de-polluting properties of a photocatalytic material by taking into account the climatologic phenomena in street canyons, accurate measurements of pollution level and full registration of meteorological data The pilot site involved three artificial canyon streets, a pollution source, continuous NOx measurements inside the canyons and the source as well as background and meteorological measurements. Significant differences on the NOx concentration level were observed between the TiO2 treated and the reference canyon. NOx values in TiO2 canyon were 36.7 to 82.0% lower than the ones observed in the reference one. Data arising from this study could be used to assess the impact of the photocatalytic material on the purification of the urban environment.
二氧化钛是用于净化应用的最重要的光催化剂。如果将含二氧化钛的材料以平板形式放置在户外，它会在白天被阳光激活以去除有害的氮氧化物气体。在这项工作中，研究了经二氧化钛处理的灰浆去除氮氧化物的光催化效率。为此，在一个试点场地设计了一个设备齐全的监测系统。该系统通过考虑街道峡谷中的气候现象、准确测量污染水平以及全面记录气象数据，对光催化材料的去污性能进行现场评估。试点场地包括三条人工峡谷街道、一个污染源、峡谷内和污染源处的氮氧化物连续测量以及背景和气象测量。在经二氧化钛处理的峡谷和参考峡谷之间，观察到氮氧化物浓度水平存在显著差异。二氧化钛峡谷中的氮氧化物值比参考峡谷中观察到的值低36.7%至82.0%。这项研究产生的数据可用于评估光催化材料对城市环境净化的影响。
