Fabrication of Z-scheme Bi5O7I/MIL-53(Fe) hybrid with improved photocatalytic performance under visible light irradiation

• Published in: Journal of materials science. Materials in electronics 2020-03, Vol.31 (6), p.4822-4835
• Main Authors: Zhou, Nan, Tan, Junjie, Li, Xi, Wang, Lu, Jin, Chenglong, Chen, Ming, Yu, Zhengsong, Liang, Yani, Qiu, Zhidong, Li, Wenlong, Dong, Yulin, Xie, Zhizhong, Lin, Yawei, Qu, Deyu, Zhang, Chaocan
• Format: Article
• Language: English
• Subjects: Catalytic activity; Characterization and Evaluation of Materials; Chemistry and Materials Science; Degradation; Energy bands; Heterojunctions; Light irradiation; Materials Science; Optical and Electronic Materials; Photocatalysis; Rhodamine
• ISSN: 0957-4522; 1573-482X
• DOI: 10.1007/s10854-020-03044-z

A series of Bi 5 O 7 I/MIL-53(Fe) (BOI/MIL- w ) composites were successfully prepared by a facile in-situ solvothermal approach. The matched energy bands enabled Bi 5 O 7 I and MIL-53(Fe) to form a Z-scheme heterojunction which resulted in an efficient separation of the photo-induced electron–hole pairs. The photocatalytic activity of BOI/MIL- w was evaluated by the degradation of Rhodamine B (RhB) in water under the visible light irradiation. Compared with Bi 5 O 7 I, photocatalytic performances of BOI/MIL- w notably boosted. When the content of added MIL-53(Fe) was 3 wt%, BOI/MIL-3 presented the highest activity with a degradation efficiency of 99.7% only after 60 min of irradiation. The reaction rate constant k could reach 0.0992 min −1 which was nearly 12.6 times as high as that of Bi 5 O 7 I. Moreover, BOI/MIL- w had a good stability and reusability, which could ensure its practical application. Trapping experiments confirmed that h + and ·O 2 − were the dominant active species during the photocatalytic process, and further demonstrated the formation of the Z-scheme heterojunction facilitated the photocatalytic performance of BOI/MIL- w .