Issue 20, 2024

Fabrication of a direct Z-scheme heterojunction of UiO-66-NH2 and tubular g-C3N4 for the stable photocatalytic reduction of CO2 to CO and CH4

Abstract

The conversion of CO2 into high-value fuels and industrial chemicals using solar energy has always been a popular research topic, and the development of highly active and stable photocatalysts is the key. In the present work, a direct Z-scheme heterojunction composite of tubular g-C3N4(TCN) and amino-functionalized UiO-66(UNH) were synthesized by solvothermal method. XRD, SEM and XPS showed that UNH grew in situ on the surface of the tubular structure of TCN and there was a close interaction via “–CO–NH–” covalent bonding between them. Photocatalytic CO2 reduction experiments exhibited that the composite T/U-0.65 possessed the optimal catalytic performance, with CH4 yields 14.85 times and 3 times higher than those of pure TCN and pure UNH, respectively. In addition, T/U-0.65 had excellent cycle stability, maintaining a CH4 yield of 89.25% through the 8th cycle. Photoelectrochemical characterization and ESR radical trapping experiments further demonstrated that the heterojunction composition was conducive to the photocatalytic reduction of CO2 activity.

Graphical abstract: Fabrication of a direct Z-scheme heterojunction of UiO-66-NH2 and tubular g-C3N4 for the stable photocatalytic reduction of CO2 to CO and CH4

Supplementary files

Article information

Article type
Paper
Submitted
26 Jun 2024
Accepted
19 Aug 2024
First published
22 Aug 2024

Catal. Sci. Technol., 2024,14, 5938-5948

Fabrication of a direct Z-scheme heterojunction of UiO-66-NH2 and tubular g-C3N4 for the stable photocatalytic reduction of CO2 to CO and CH4

H. Liu, Y. Yang, C. Guo and Y. Zhou, Catal. Sci. Technol., 2024, 14, 5938 DOI: 10.1039/D4CY00790E

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