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首页> 外文期刊>Applied Surface Science >Visible light-responsive Fe-loaded TiO_2 photocatalysts for total oxidation of acetaldehyde: Fundamental studies towards large-scale production and applications
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Visible light-responsive Fe-loaded TiO_2 photocatalysts for total oxidation of acetaldehyde: Fundamental studies towards large-scale production and applications

机译：可见光响应性的铁负载TiO_2光催化剂可用于乙醛的完全氧化：大规模生产和应用的基础研究

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Various Fe loadings were applied onto P25 TiO2 using temperature-controlled vapour deposition and the resulting structures were subsequently annealed at 750 degrees C. As-received TiO2 was nearly photo-catalytically inactive for acetaldehyde decomposition under visible light, but when a very small amount of Fe below the threshold was loaded, the activity became maximized. Control of Fe loading is critical to prepare high-performing Fe-TiO2 photocatalysts since a larger amount of Fe forms larger iron oxide particles, which induces non-radiative recombination of the optically excited electron-hole pairs, thereby reducing the photocatalytic activity. Regarding the reaction mechanism, fast oxidation of acetaldehyde into CO2 and a slower path via acetic acid to CO2 were identified, where almost no evolution of secondary pollutant vapour was identified. A strategy towards large-scale production and stable fixation of photocatalyst powder on surfaces of construction materials for real air purification applications are discussed.
机译：使用温度控制的气相沉积将各种Fe负载施加到P25 TiO2上，然后将所得结构在750摄氏度下进行退火。接收到的TiO2在可见光下几乎无光催化乙醛分解，但是当少量的加载低于阈值的铁，使活性最大化。铁含量的控制对于制备高性能Fe-TiO2光催化剂至关重要，因为大量的Fe会形成较大的氧化铁颗粒，这会引起光激发电子-空穴对的非辐射复合，从而降低光催化活性。关于反应机理，已确定乙醛快速氧化为CO2以及通过乙酸至CO2的较慢路径，其中几乎没有发现二次污染物蒸气的逸出。讨论了一种用于大规模生产和将光触媒粉末稳定固定在建筑材料表面以用于实际空气净化应用的策略。

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