Solid mediator Z-scheme heterojunction photocatalysis for pollutant oxidation in water: Principles and synthesis perspectives
Journal
Journal of the Taiwan Institute of Chemical Engineers
Journal Volume
125
Pages
88-114
Date Issued
2021
Author(s)
Abstract
Background: The solid mediator Z-scheme heterojunctions are promising photocatalysts that have narrow band gaps to allow excitation of incorporated electrons under visible lights but with sufficient separation of the yielded electron hole-pairs and without suffering the reduction of their oxidization and reduction powers. Successful synthesis of mediator Z-scheme heterojunction acquires production of constituent semiconductors with desired Fermi levels and close contacts of the semiconductors with sandwiched metal mediator. Methods: This mini-review discussed briefly the principles of photocatalyst and heterojunction photocatalysts, and then the current research and development studies on the way to design and synthesis of Z-scheme heterojunction were summarized. Significant findings: Based on literature results, the perspectives to design and synthesis of a solid mediator Z-scheme for degrading specific pollutant were discussed and outlined. An illustrative example of design and synthesis of a novel Z-scheme photocatalyst, CuFe2O4/Cu/UiO66-NH2, with demonstration of its photodegradation performance of dye rhodamine 6 G, was presented at the end of the review. ? 2021 Taiwan Institute of Chemical Engineers
Subjects
Demonstration
Heterojunction
Mechanism
Photocatalyst
Synthesis
Energy gap
Water pollution
CuFe2O4
Electron hole pairs
Narrow band gap
Oxidization
Pollutant oxidation
Research and development
Rhodamine 6G
Visible light
Heterojunctions
SDGs
Type
review