Issue 9, 2024

Z-scheme charge transfer between a conjugated polymer and α-Fe2O3 for simultaneous photocatalytic H2 evolution and ofloxacin degradation

Abstract

The replacement of the oxygen evolution reaction with a higher valuable oxidation process can overcome the sluggish kinetics to promote renewable hydrogen production, simultaneously achieving energy storage and environmental protection. However, the effective integration of two redox half-reactions in one photocatalytic reaction system is still a challenge. Here the p-diethynylbenzene and dibenzothiophene sulfone copolymer (PEB-DBT) is well-designed to couple with α-Fe2O3via a palladium-catalyzed Sonogashira cross-linking reaction, forming a heterojunction with strong interfacial interaction. In particular, there is a different preferred charge transfer path of PEB-DBT/α-Fe2O3via modulating the work function difference in various solutions. The results suggest that the Z-scheme electron transfer pathway is predominant in triethanolamine (TEOA) and ofloxacin (OFL) solutions, instead of the type-II heterojunction that forms in H2O or methylene blue (MB). The Z-scheme PEB-DBT/α-Fe2O3 heterojunction has excellent performance in the hydrogen evolution half-reaction and OFL degradation, which is about 2.7 times and 3.3 times higher than that of pure PEB-DBT, respectively. Finally, it successfully achieved simultaneous photocatalytic H2 evolution and OFL degradation under visible light.

Graphical abstract: Z-scheme charge transfer between a conjugated polymer and α-Fe2O3 for simultaneous photocatalytic H2 evolution and ofloxacin degradation

Supplementary files

Article information

Article type
Paper
Submitted
22 Nov 2023
Accepted
22 Jan 2024
First published
23 Jan 2024

J. Mater. Chem. A, 2024,12, 5366-5376

Z-scheme charge transfer between a conjugated polymer and α-Fe2O3 for simultaneous photocatalytic H2 evolution and ofloxacin degradation

Z. Xiao, J. Xiao, L. Yuan, M. Ai, F. Idrees, Z. Huang, C. Shi, X. Zhang, L. Pan and J. Zou, J. Mater. Chem. A, 2024, 12, 5366 DOI: 10.1039/D3TA07217G

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