ABSTRACT

By immobilising LaFeO₃ and Au nanoparticles on the surface of Cu₂O polyhedral microspheres, we have prepared novel binary LaFeO₃/Cu₂O and ternary Au/LaFeO₃/Cu₂O composite photocatalysts. The as-fabricated composites were systematically investigated by using various characterisation techniques. Photocurrent response and EIS measurements suggest that the composite photocatalysts exhibit an electron/hole pair separation more efficient than bare LaFeO₃ and Cu₂O. The photocatalysis and photo-Fenton degradation experiments were carried out by removing RhB from water under simulated sunlight irradiation. The composite photocatalysts are demonstrated to have superior photocatalysis/photo-Fenton degradation performances to bare LaFeO₃ and Cu₂O. 20%LaFeO₃/Cu₂O is determined to be the optimal binary composite photocatalyst. Moreover, the decoration of Au nanoparticles onto the 20%LaFeO₃/Cu₂O composite can further improve the photocatalysis/photo-Fenton degradation performance. The enhanced photocatalysis and photo-Fenton decomposition mechanisms for the ternary Au/LaFeO₃/Cu₂O composites were investigated and discussed on the based of the Z-scheme electron transfer process, LSPR of Au nanoparticles and photo-Fenton synergistic effect.

摘要

通过在Cu ₂ O多面体微球表面固定LaFeO ₃和Au纳米颗粒，我们制备了新型二元LaFeO ₃ /Cu ₂ O和三元Au/LaFeO ₃ /Cu ₂ O复合光催化剂。通过使用各种表征技术系统地研究了制造的复合材料。光电流响应和 EIS 测量表明复合光催化剂表现出比裸 LaFeO ₃和 Cu ₂更有效的电子/空穴对分离O. 通过在模拟阳光照射下从水中去除 RhB 来进行光催化和光芬顿降解实验。该复合光催化剂被证明具有优于裸LaFeO ₃和Cu ₂ O的光催化/光芬顿降解性能。20%LaFeO ₃ /Cu ₂ O被确定为最佳的二元复合光催化剂。此外，将Au纳米颗粒装饰在20%LaFeO ₃ /Cu ₂ O复合材料上可以进一步提高光催化/光芬顿降解性能。三元Au/LaFeO ₃ /Cu ₂的增强光催化和光芬顿分解机制基于Z-scheme电子转移过程、Au纳米颗粒的LSPR和光-芬顿协同效应对O复合材料进行了研究和讨论。