Fabrication of magnetic dual Z-scheme heterojunction materials for efficient photocatalytic performance: The study of ternary novel MIL-88A(Fe)/BiOBr/SrFe12O19 nanocomposite

• Published in: Separation and purification technology 2022-05, Vol.289, p.120778, Article 120778
• Main Authors: Gu, Jiabao, Li, Qianwen, Long, Xuanyu, Zhou, Xiaohan, Liu, Nan, Li, Zequan
• Format: Article
• Language: English
• Subjects: Dual Z-scheme heterojunction; MBSr; Photocatalysis; Photocatalytic activity; Visible light
• ISSN: 1383-5866; 1873-3794
• DOI: 10.1016/j.seppur.2022.120778

[Display omitted] •A dual Z-scheme MBSr ternary composite was developed.•The dual Z-scheme heterojunction enhanced visible-light adsorption and the transfer of photoinduced charged carriers.•The photocatalytic performance of MBSr is superior to that of single and binary composites.•Possible photodegradation pathway and mechanism of RhB were proposed. In this study, we synthesized the MBSr (MIL-88A(Fe)/BiOBr/SrFe12O19) dual Z-scheme heterojunction via an accessible hydrothermal method and investigated the photocatalytic performance of MBSr composites for Rhodamine B (RhB) and Methylene blue (MB). The MBSr-1% photocatalyst exhibited excellent photocatalytic performance, resulting the degradation rate of RhB reached approximately 96.2% within 60 min, which was higher than that of M88 (34%), BiOBr (89%) and M88/BiOBr-7% (93.7%) composites. And the MBSr-1% could eliminate 90.1% of MB within 90 min, which displayed the best photodegradation efficiency of prepared photocatalysts. The enhanced photocatalytic performance can be ascribed to the formation of dual Z-scheme heterojunction, which enhanced visible-light absorption and facilitated the transfer of photoinduced carriers. The MBSr-1% was proved to have excellent stability and reusability after six-recycling run. Furthermore, the major reactive species were h+, •O2− and •OH by radical trapping experiments. Finally, a possible photocatalytic pathway and mechanism of MBSr photocatalysts was proposed.