School of Environmental Science and Engineering, Zhejiang Gongshang University, Hangzhou, 310018, China.
CCTEG Hangzhou Research Institute Co., Ltd., Hangzhou, Zhejiang, 310018, China.
Chemosphere. 2023 Dec;344:140277. doi: 10.1016/j.chemosphere.2023.140277. Epub 2023 Sep 26.
The photocatalytic efficiency is commonly restrained by inferior charge separation rate. Herein, the S-scheme MIL-100(Fe)/NH-MIL-125(Ti) (MN) photo-Fenton catalyst with the built-in electric field (BEF) was successfully constructed by a simple ball-milling technique. As a result, the MN-3 (the mass ratio of MIL-100(Fe) to NH-MIL-125(Ti) was 3) composite presented the best visible-light-induced photocatalytic ability, in contrast to pure MIL-100(Fe) and NH-MIL-125(Ti). The reduction efficiency of Cr(VI) almost reached 100% within 35 min of illumination. Moreover, the MN-3 heterojunction also exhibited the highest antibacterial activity, and about 100% E. coli and more than 90% S. aureus were killed within 60 min of illumination. In photo-Fenton system, In the photo-Fenton system, e, O and Fe played vital roles for Cr(VI) reduction, and •OH, h and O and O were responsible for sterilization. Additionally, 5 cyclic tests and relevant characterizations confirmed the excellent repeatability and stability of the composite. Also, the S-scheme charge transfer process was put forward. This work offers a novel idea for establishing the MOF-on-MOF photo-Fenton catalyst for high-efficiency environmental mitigation.
光催化效率通常受到较差的电荷分离速率的限制。在此，通过简单的球磨技术成功构建了内置电场（BEF）的 S 型 MIL-100(Fe)/NH-MIL-125(Ti)（MN）光芬顿催化剂。结果，MN-3（MIL-100(Fe)与 NH-MIL-125(Ti)的质量比为 3）复合材料表现出最佳的可见光诱导光催化能力，与纯 MIL-100(Fe)和 NH-MIL-125(Ti)相比。在光照 35 分钟内，Cr(VI)的还原效率几乎达到 100%。此外，MN-3 异质结还表现出最高的抗菌活性，在光照 60 分钟内，约 100%的大肠杆菌和超过 90%的金黄色葡萄球菌被杀死。在光芬顿体系中，e、O 和 Fe 在 Cr(VI)还原中起着至关重要的作用，而•OH、h 和 O 和 O 则负责杀菌。此外，5 次循环测试和相关表征证实了该复合材料的优异可重复性和稳定性。此外，还提出了 S 型电荷转移过程。这项工作为建立高效环境缓解的 MOF-on-MOF 光芬顿催化剂提供了一个新的思路。
