Salvadores Federico, Reli Martin, Alfano Orlando M, Kočí Kamila, Ballari María de Los Milagros
Instituto de Desarrollo Tecnológico para la Industria Química (Universidad Nacional del Litoral and Consejo Nacional de Investigaciones Científicas y Técnicas), Santa Fe, Argentina.
Institute of Environmental Technology, Vysoká Škola Báňská-Technical University of Ostrava, Ostrava, Czechia.
Front Chem. 2020 Oct 23;8:551710. doi: 10.3389/fchem.2020.551710. eCollection 2020.
The removal of indoor and outdoor air pollutants is crucial to prevent environmental and health issues. Photocatalytic building materials are an energy-sustainable technology that can completely oxidize pollutants, improving the air quality of contaminated sites. In this work, different photoactive TiO catalysts (anatase or modified anatase) and amounts were used to formulate photocatalytic paints in replacement of the normally used TiO (rutile) pigment. These paints were tested in two different experimental systems simulating indoor and outdoor environments. In one, indoor illumination conditions were used in the photoreactor for the oxidation of acetaldehyde achieving conversions between 37 and 55%. The other sets of experiments were performed under simulated outdoor radiation for the degradation of nitric oxide, resulting in conversions between 13 and 35%. This wide range of conversions made it difficult to directly compare the paints. Thus, absorption, photonic, and quantum efficiencies were calculated to account for the paints photocatalytic performance. It was found that the formulations containing carbon-doped TiO presented the best efficiencies. The paint with the maximum amount of this photocatalyst showed the highest absorption and photonic efficiencies. On the other hand, the paint with the lowest amount of carbon-doped TiO presented the highest value of quantum efficiency, thus becoming the optimal formulation in terms of energy use.
去除室内和室外空气污染物对于预防环境和健康问题至关重要。光催化建筑材料是一种能源可持续技术，能够完全氧化污染物，改善受污染场所的空气质量。在这项工作中，使用了不同的光活性TiO催化剂（锐钛矿型或改性锐钛矿型）及其用量来配制光催化涂料，以替代通常使用的TiO（金红石型）颜料。这些涂料在模拟室内和室外环境的两种不同实验系统中进行了测试。在其中一个系统中，在光反应器中使用室内光照条件来氧化乙醛，转化率在37%至55%之间。另一组实验是在模拟室外辐射条件下进行的，用于降解一氧化氮，转化率在13%至35%之间。如此广泛的转化率使得难以直接比较这些涂料。因此，计算了吸收效率、光子效率和量子效率，以评估涂料的光催化性能。结果发现，含有碳掺杂TiO的配方表现出最佳效率。含有最大量这种光催化剂的涂料显示出最高的吸收效率和光子效率。另一方面，含有最低量碳掺杂TiO的涂料表现出最高的量子效率值，因此就能源利用而言成为最佳配方。
