Issue 29, 2024, Issue in Progress

Construction of Zn–Cu bimetallic metal–organic frameworks for carbon dioxide capture

Abstract

Bimetallic metal–organic frameworks (MOFs) have shown more impressive performance in gas adsorption compared with monometallic MOFs. Herein, a Cu–Zn bimetallic metal–organic framework (Zn/Cu-BTC) was synthesized via a one-pot method, and its structure, thermal stability and CO2 adsorption property were investigated and compared with those of corresponding monometallic Cu-BTC and Zn-BTC. The results showed that Zn/Cu-BTC has a specific ortho-octahedral crystal morphology with a unique X-ray diffraction peak, the atomic ratio of Zn to Cu is about 1 : 5, and it remained stable at a temperature up to 490 K. In Zn/Cu-BTC, Cu2+ played a role in increasing the specific surface area and porosity of the MOF and improving the gas adsorption performance. The CO2 adsorption of Zn/Cu-BTC is lower than that of Cu-BTC but much higher than that of Zn-BTC, and CO2 adsorption heat was 30.52 kJ mol−1, which indicated physical adsorption. In addition, Zn/Cu-BTC had higher CO2/N2 adsorption selectivity compared with Zn-BTC and Cu-BTC, with a maximum value of 17. This study can be a reference for the research on improving the adsorption selectivity of gases by constructing bimetallic MOFs.

Graphical abstract: Construction of Zn–Cu bimetallic metal–organic frameworks for carbon dioxide capture

Article information

Article type
Paper
Submitted
14 May 2024
Accepted
19 Jun 2024
First published
01 Jul 2024
This article is Open Access
Creative Commons BY-NC license

RSC Adv., 2024,14, 20780-20785

Construction of Zn–Cu bimetallic metal–organic frameworks for carbon dioxide capture

X. Li, S. Li, J. Liu, J. Zhang, Y. Ren and J. Zhao, RSC Adv., 2024, 14, 20780 DOI: 10.1039/D4RA03539A

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