Construction of novel ternary Au/LaFeO3/Cu2O composite photocatalysts for RhB degradation via photo-Fenton catalysis
Construction of novel ternary Au/LaFeO3/Cu2O composite photocatalysts for RhB degradation via photo-Fenton catalysis
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DOI：
10.1080/10667857.2020.1782062
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发表时间：
2020-06-21
影响因子：
3.1
通讯作者：
Yang, Hua
中科院分区：
文献类型：
--
作者：
Guan, Sitao;Li, Ruishan;Yang, Hua
通过将LaFeO（3）和Au纳米粒子固定在Cu 2 O多面体微球表面，制备了新型的二元LaFeO 3/Cu 2 O和三元Au/LaFeO 3/Cu 2 O复合光催化剂。所制造的复合材料进行了系统的研究，通过使用各种表征技术。光电流响应和交流阻抗测试表明，复合光催化剂比LaFeO（3）和Cu 2 O具有更好的电子/空穴对分离性能。在模拟太阳光照射下，对RhB进行了光催化降解和光Fenton降解实验。复合光催化剂具有上级光Fenton降解性能，优于LaFeO（3）和Cu 2 O。确定20%LaFeO3/Cu 2 O为最佳的二元复合光催化剂。此外，Au纳米粒子修饰在20%LaFeO3/Cu 2 O复合材料上，可进一步提高TiO 2/photo-Fenton降解性能。基于Z-模式电子转移过程、Au纳米粒子的LSPR和光-Fenton协同效应，对三元复合体系Au/LaFeO 3/Cu 2 O的光-Fenton协同分解机理进行了研究和探讨。
By immobilising LaFeO(3)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 LaFeO(3)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 LaFeO(3)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.