Sanabria Arenas Beatriz Eugenia, Strini Alberto, Schiavi Luca, Li Bassi Andrea, Russo Valeria, Del Curto Barbara, Diamanti Maria Vittoria, Pedeferri MariaPia
Department of Chemistry, Materials and Chemical Engineering "G. Natta" Politecnico di Milano, Via Mancinelli 7, Milan 20131, Italy.
ITC-CNR, Construction Technologies Institute, Viale Lombardia 49, San Giuliano Milanese, Milan 20098, Italy.
Materials (Basel). 2018 Mar 24;11(4):488. doi: 10.3390/ma11040488.
The availability of immobilized nanostructured photocatalysts is of great importance in the purification of both polluted air and liquids (e.g., industrial wastewaters). Metal-supported titanium dioxide films with nanotubular morphology and good photocatalytic efficiency in both environments can be produced by anodic oxidation, which avoids release of nanoscale materials in the environment. Here we evaluate the effect of different anodizing procedures on the photocatalytic activity of TiO₂ nanostructures in gas and liquid phases, in order to identify the most efficient and robust technique for the production of TiO₂ layers with different morphologies and high photocatalytic activity in both phases. Rhodamine B and toluene were used as model pollutants in the two media, respectively. It was found that the role of the anodizing electrolyte is particularly crucial, as it provides substantial differences in the oxide specific surface area: nanotubular structures show remarkably different activities, especially in gas phase degradation reactions, and within nanotubular structures, those produced by organic electrolytes lead to better photocatalytic activity in both conditions tested.
固定化纳米结构光催化剂的可用性对于净化污染空气和液体（如工业废水）非常重要。具有纳米管形态且在两种环境中均具有良好光催化效率的金属负载二氧化钛薄膜可通过阳极氧化制备，这避免了纳米级材料在环境中的释放。在此，我们评估不同阳极氧化程序对TiO₂纳米结构在气相和液相中的光催化活性的影响，以便确定生产具有不同形态且在两相中均具有高光催化活性的TiO₂层的最有效和稳健的技术。罗丹明B和甲苯分别用作两种介质中的模型污染物。结果发现，阳极氧化电解质的作用尤为关键，因为它会导致氧化物比表面积存在显著差异：纳米管结构表现出明显不同的活性，尤其是在气相降解反应中，并且在纳米管结构中，由有机电解质产生的纳米管结构在两种测试条件下均具有更好的光催化活性。
