Heterogeneous Fenton reaction has a great application potential in water purification, but efficient catalysts are still lacking. Iron phosphide (FeP) has a higher activity than the conventional Fe-based catalysts for Fenton reactions, but its ability as a Fenton catalyst to directly activate H₂O₂ remains unreported. Herein, we demonstrate that the fabricated FeP has a lower electron transfer resistance than the typical conventional Fe-based catalysts, i.e., Fe₂O₃, Fe₃O₄, and FeOOH, and thus could active H₂O₂ to produce hydroxyl radicals more efficiently. In the heterogeneous Fenton reactions for sodium benzoate degradation, the FeP catalyst presents a superior activity with a reaction rate constant more than 20 times those of the other catalysts (i.e., Fe₂O₃, Fe₃O₄, and FeOOH). Moreover, it also exhibits a great catalytic activity in the treatment of real water samples and has a good stability in the cycling tests. Furthermore, the FeP could be loaded onto a centimeter-sized porous carbon support and the prepared macro-sized catalyst exhibits an excellent water treatment performance and can be well recycled. This work reveals a great potential of FeP as a catalyst for heterogeneous Fenton reactions and may inspire further development and practical application of highly efficient catalysts for water purification.

多相芬顿反应在水净化方面具有巨大的应用潜力，但仍缺乏高效的催化剂。磷化铁(FeP)比传统的Fenton反应铁基催化剂具有更高的活性，但其作为Fenton催化剂直接活化H 2 O ₂的_能力尚未报道。在此，我们证明所制备的 FeP 比典型的传统铁基催化剂（即 Fe ₂ O ₃、Fe ₃ O ₄和 FeOOH）具有更低的电子转移电阻，因此可以活化 H ₂ O ₂更有效地产生羟基自由基。_{在苯甲酸钠降解的非均相芬顿反应中，FeP催化剂表现出优异的活性，反应速率常数是其他催化剂（即Fe 2} O ₃、Fe ₃ O ₄）的20倍以上。和 FeOOH)。此外，它在处理真实水样时也表现出良好的催化活性，并且在循环测试中具有良好的稳定性。此外，FeP可以负载在厘米级的多孔碳载体上，所制备的大尺寸催化剂表现出优异的水处理性能，并且可以很好地回收利用。这项工作揭示了FeP作为非均相芬顿反应催化剂的巨大潜力，并可能激发高效水净化催化剂的进一步开发和实际应用。