一锅法制备S型异质结光催化剂Fe2O3/Fe2TiO5及其高效降解有机污染物性能

首次采用简单的一锅法制备了Fe₂O₃/Fe₂TiO₅异质结纳米材料。构建S型异质结后，与纯的Fe₂O₃和Fe₂TiO₅相比，Fe₂O₃/Fe₂TiO₅复合材料表现出更高的光催化降解速率和效率。经过2.5 h的光照后，Fe₂O₃/Fe₂TiO₅可以降解接近100%的亚甲基蓝（MB）。在Fe₂O₃/Fe₂TiO₅复合材料中，Fe₂O₃和Fe₂TiO₅之间形成了内建电场，可以促进光生电子-空穴对的分离。因此，具有更高能量的Fe₂TiO₅导带中的电子和具有更高能量的Fe₂O₃价带中的空穴可以得到有效的保留，从而使它们更加有效地扩散到催化剂表面，并参加降解反应。此外，Fe₂O₃/Fe₂TiO₅复合材料具有很好的光催化稳定性。

One-Pot Preparation of Fe2O3/Fe2TiO5 S-Scheme Heterojunction Photocatalyst for Highly Efficient Degradation of Organic Pollution

For the first time, Fe₂O₃/Fe₂TiO₅ heterojunction materials have been fabricated by a facile one-pot solvothermal method. After the construction of the S-scheme heterojunction, compared to pure Fe₂O₃ and Fe₂TiO₅, the photocatalytic degradation rate and efficiency of Fe₂O₃/Fe₂TiO₅ were significantly improved. After being illuminated for 2.5 h, nearly 100% of methylene blue (MB) has been degraded by Fe₂O₃/Fe₂TiO₅. In Fe₂O₃/Fe₂TiO₅ composite material, a built-in field is formed between Fe₂O₃ and Fe₂TiO₅, thus promoting the separation of photogenerated electron-hole pairs. Therefore, electrons in the conduction band (CB) of Fe₂TiO₅ and holes in the valence band (VB) of Fe₂O₃ with higher energy, which show high reduction and oxidation capacity, respectively, can retain and transfer to the surface to participate in the degradation reaction. Moreover, Fe₂O₃/Fe₂TiO₅ composite showed good photocatalytic stability.