S-scheme MOF-on-MOF heterojunctions for enhanced photo-Fenton Cr(VI) reduction and antibacterial effects

Longyang Wang; Kejie Zhang; Jianying Qian; Mengyi Qiu; Ningyi Li; Hao Du; Xiao Hu; Yangjie Fu; Meng Tan; Derek Hao; Qi Wang

doi:10.1016/j.chemosphere.2023.140277

S-scheme MOF-on-MOF heterojunctions for enhanced photo-Fenton Cr(VI) reduction and antibacterial effects

Chemosphere. 2023 Dec:344:140277. doi: 10.1016/j.chemosphere.2023.140277. Epub 2023 Sep 26.

Authors

Longyang Wang¹, Kejie Zhang¹, Jianying Qian², Mengyi Qiu¹, Ningyi Li¹, Hao Du³, Xiao Hu¹, Yangjie Fu¹, Meng Tan¹, Derek Hao⁴, Qi Wang⁵

Affiliations

¹ School of Environmental Science and Engineering, Zhejiang Gongshang University, Hangzhou, 310018, China.
² CCTEG Hangzhou Research Institute Co., Ltd., Hangzhou, Zhejiang, 310018, China.
³ School of Environmental Science and Engineering, Zhejiang Gongshang University, Hangzhou, 310018, China. Electronic address: duhao@mail.zjgsu.edu.cn.
⁴ School of Science, RMIT University, Melbourne, VIC, 3000, Australia.
⁵ School of Environmental Science and Engineering, Zhejiang Gongshang University, Hangzhou, 310018, China; Key Laboratory of the Ministry of Education for Advanced Catalysis Materials, Zhejiang Normal University, Jinhua, 321004, China.

PMID: 37769912
DOI: 10.1016/j.chemosphere.2023.140277

Abstract

The photocatalytic efficiency is commonly restrained by inferior charge separation rate. Herein, the S-scheme MIL-100(Fe)/NH₂-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 NH₂-MIL-125(Ti) was 3) composite presented the best visible-light-induced photocatalytic ability, in contrast to pure MIL-100(Fe) and NH₂-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^-, O₂^•- and Fe²⁺ played vital roles for Cr(VI) reduction, and •OH, h⁺ and O₂^•- and ¹O₂ 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.

Keywords: Antibacterial effects; Cr(VI) remediation; MOF-On-MOF; Photo-Fenton; S-scheme.

MeSH terms

Anti-Bacterial Agents / pharmacology
Chromium
Escherichia coli*
Staphylococcus aureus*

Substances

chromium hexavalent ion
Anti-Bacterial Agents
Chromium