The effectiveness of metal–organic frameworks (MOFs) as solid-state electron mediators for rhodamine B (RhB) degradation in a Z-scheme photocatalysis system is demonstrated. Novel Z-scheme Ag₃PO₄/MIL-101/NiFe₂O₄ (APO/MOF/NFO) composites were synthesized by an in situ precipitation method and employed to degrade RhB dye under visible-light irradiation. The photocatalytic activity results demonstrated that the Z-scheme APO/MOF/NFO(20%) photocatalyst showed relatively improved photocatalytic activity and stability in the degradation of RhB over the individual APO, NFO and APO/NFO materials. By the electrochemical and fluorescence measurements, the APO/MOF/NFO(20%) material also showed a larger transient photocurrent, lower impedance, and longer fluorescence lifetime (7.68 ns). Comparing the activity results with the characterization results, it was indicated that the photocatalytic activity depends on the rapid transfer of electrons from APO to NFO through the three-dimensional structure of the MOF. Furthermore, the possible mechanism for the photodegradation process of APO/MOF/NFO(20%) was proposed to illustrate excellent photocatalytic activity. The present study has paved a new way for using the attractive MOF in the design of a new and efficient system for organic dye degradation in wastewater.

中文翻译：

---

新型Z方案Ag ₃ PO ₄ / MIL-101 / NiFe ₂ O ₄复合材料对可见光驱动的罗丹明B的高效催化降解†

证明了金属有机骨架（MOF）作为Z方案光催化系统中若丹明B（RhB）降解的固态电子介体的有效性。通过原位合成新颖的Z型Ag ₃ PO ₄ / MIL-101 / NiFe ₂ O ₄（APO / MOF / NFO）复合材料沉淀法并用于在可见光照射下降解RhB染料。光催化活性结果表明Z方案APO / MOF / NFO（20％）光催化剂相对于单独的APO，NFO和APO / NFO材料在RhB降解中显示出相对提高的光催化活性和稳定性。通过电化学和荧光测量，APO / MOF / NFO（20％）材料还显示出更大的瞬态光电流，更低的阻抗和更长的荧光寿命（7.68 ns）。将活性结果与表征结果进行比较，表明光催化活性取决于电子通过MOF的三维结构从APO向NFO的快速转移。此外，提出了APO / MOF / NFO（20％）光降解过程的可能机理，以说明其优异的光催化活性。本研究为在设计新颖，高效的废水中有机染料降解系统中使用吸引人的MOF铺平了道路。