The influence of the addition of different doping agents (N, W and Hf) on the macroporous TiO₂ photoactivity toward the Rhodamine B degradation and ethanol photo-oxidation was evaluated. The samples were characterized by XRD, XPS, SEM, TEM, N₂ adsorption-desorption, UV–vis Diffuse Reflectance and Photoluminescence spectroscopies to study also the changes in the physico-chemical properties due to the presence of dopants.

The photonic effect and the high ordered porous structure of the macroporous TiO₂ that lead to increase the path length of the light, were the key factors that allow to enhance the catalytic activity towards the dye and VOC degradation under visible and solar light irradiation of these materials compared to the commercial TiO₂ anatase. A significant improvement of the catalytic performances was achieved when the amount of the dopant was low, the ionic exchange of Ti⁴⁺ ions by doping ions and the consequent substitution in the crystal lattice of TiO₂ was favoured, and/or the formation of non-stoichiometric Ti-compound on the TiO₂ surface was promoted.

评估了添加不同掺杂剂（N，W和Hf）对大孔TiO ₂光活性对若丹明B降解和乙醇光氧化的影响。通过XRD，XPS，SEM，TEM，N ₂吸附-解吸，紫外可见漫反射和光致发光光谱对样品进行表征，以研究由于掺杂剂的存在而引起的物理化学性质的变化。

大孔TiO ₂的光子效应和高度有序的多孔结构会导致光的光程增加，这是在可见光和日光照射下可增强对染料的催化活性和VOC降解的关键因素。与市售TiO ₂锐钛矿相比 当掺杂剂的量低，通过掺杂离子进行的Ti ⁴⁺离子的离子交换以及随后在TiO _2的晶格中被取代和/或形成非TiO ₂时，可实现催化性能的显着改善。促进了TiO ₂表面上的化学计量的Ti化合物。