The photocatalytic efficiency is commonly restrained by inferior charge separation rate. Herein, the S-scheme MIL-100(Fe)/NH 2 -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 2 -MIL-125(Ti) was 3) composite presented the best visible-light-induced photocatalytic ability, in contrast to pure MIL-100(Fe) and NH 2 -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 2 •- and Fe 2+ played vital roles for Cr(VI) reduction, and •OH, h + and O 2 •- and 1 O 2 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.
Keyphrases
- metal organic framework
- visible light
- wastewater treatment
- hydrogen peroxide
- high efficiency
- room temperature
- electron transfer
- nitric oxide
- climate change
- perovskite solar cells
- reduced graphene oxide
- magnetic resonance imaging
- human health
- risk assessment
- gold nanoparticles
- high resolution
- ionic liquid
- liquid chromatography