Fe₃O₄ nanoparticles supported on zirconium-based metal-organic frameworks, UiO-66, were firstly used as a tool for exploring the interaction between dual active centers in Fenton-like reactions. Compared with traditional H₂O₂/Fe₃O₄ system, nearly 3 times hydroxyl radicals (HO^•) were found in the H₂O₂/Fe₃O₄@UiO-66 system at pH 5. Additionally, singlet oxygen (¹O₂) was also detected in the H₂O₂/Fe₃O₄@UiO-66 system. X-ray photoelectron and Mössbauer spectroscopy analyses indicate that the electrons on ≡Fe(II) were directed towards Zr, causing ≡Fe(II) to lose electrons more easily, which facilitates H₂O₂ reduction. However, ¹O₂ was formed when superoxide anions (O₂^•−) lost electrons on the Zr center; these electrons can be transferred to ≡Fe(III), accelerating ≡Fe(III) reduction. These findings reveal that Zr centers can interact with Fe to form dual active centers in Fenton-like reactions. And it also provides a novel strategy to optimize dual active center catalysts for Fenton-like processes in water remediation.

锆基金属有机骨架UiO-66上负载的Fe ₃ O ₄纳米颗粒首先被用作探索类Fenton反应中双活性中心之间相互作用的工具。与传统的H ₂ O ₂ / Fe ₃ O ₄体系相比，在pH 5的H ₂ O ₂ / Fe ₃ O ₄ @ UiO-66体系中发现了近3倍的羟基自由基（HO ^•）。在H ₂ O ₂ / Fe ₃ O _4中也检测到¹ O ₂）@ UiO-66系统。X射线光电子和Mössbauer光谱分析表明，≡Fe（II）上的电子被导向Zr，导致≡Fe（II）更容易失去电子，从而促进了H ₂ O _2的还原。但是，当超氧阴离子（O ₂ ^•-）在Zr中心失去电子时，会形成¹ O ₂。这些电子可以转移到≡Fe（III），加速≡Fe（III）的还原。这些发现表明Zr中心可以与Fe相互作用，从而在Fenton样反应中形成双重活性中心。它还提供了一种新颖的策略来优化水修复中类似Fenton的工艺的双重活性中心催化剂。