Photo-Fenton reaction is a more effective technique for pollutant disposal than photocatalytic reaction. Herein, Fe₂O₃@polypyrrole/Prussian blue (Fe₂O₃@PPy/PB) with a hierarchical porous structure was prepared by a reactive-template method. After transforming typical type-II Fe₂O₃@PPy to Z-scheme Fe₂O₃@PPy/PB via PB as a bridge, the degradation rate was increased by 1.4 times in photocatalytic reaction and 4.0 times in photo-Fenton reaction due to higher visible-light harvest, enhanced separation efficiency of photoinduced charges, lower interface resistance, and especially well-preserved redox potentials of holes and electrons. Mechanism studies revealed that holes were quenched by H₂O₂, and this led to ^•O₂⁻ generation and efficient separation of electrons. Meanwhile, O₂ was reduced by separated electrons, and this further increased ^•O₂⁻ yield. Therefore, the main radicals changed from hole in photocatalytic reaction to ^•O₂⁻ in the photo-Fenton reaction, leading to an increase as high as 12.1-fold enhancement in the degradation rate. Conversely, only H₂O₂ participated into photocatalytic reaction using Fe₂O₃@PPy while O₂ was absent, resulting in merely 4.2-fold improvement. This manuscript gives a comprehensive understanding on mechanisms of type-II and Z-scheme heterojunctions in both photocatalytic and photo-Fenton reactions. Obviously, the outcomes are beneficial for designing catalysts with high photo-Fenton activity.

光芬顿反应比光催化反应是一种更有效的污染物处理技术。在此，通过反应模板法制备具有分级的多孔结构的Fe ₂ O ₃聚吡咯/普鲁士蓝（Fe ₂ O ₃ PPy / PB）。在将典型的II型Fe ₂ O ₃ @PPy转化为Z型Fe ₂ O _3之后@ PPy / PB通过PB作为桥，由于更高的可见光收率，增强的光诱导电荷分离效率，较低的界面电阻，光催化反应的降解速率提高了1.4倍，光芬顿反应的降解速率提高了4.0倍。空穴和电子的保存完好的氧化还原电位。机理研究表明，孔是由H淬火₂ Ø ₂，这导致^• Ø ₂ ^-生成和电子有效地分离。同时，O- ₂通过分离的电子减少，这进一步增加^• ö ₂ ^-产量。因此，主要自由基从光催化反应中的空穴变为^• ø ₂ ^-在光Fenton反应，从而增加高达中的降解率12.1倍的增强。相反，仅Fe ₂ O ₃ @PPy参与H ₂ O _2的光催化反应，而不存在O ₂，仅提高4.2倍。该手稿对光催化和光芬顿反应中的II型和Z型异质结的机理提供了全面的了解。显然，结果对于设计具有高光芬顿活性的催化剂是有益的。