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Metal ions can be separated from one another by complexation with organic ligands–the chelating agent– to form uncharged chelates. Here, the chelating agent must contain hydrophobic groups and behave as a weak acid, losing a proton to bind with the metal. Since most organic ligands used in this process are insoluble or undergo oxidation in the aqueous phase, the chelating agent is initially added to the organic phase and extracted into the aqueous phase. The metal-ligand complex is formed in...

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A tetrazole-functionalized Cu-MOF for efficient C₂H₂/CO₂ separation.

Jingjing Chen¹, Fugang Li¹, Zihao Zhao²

¹Shandong Key Laboratory of Intelligent Energy Materials, School of Materials Science and Engineering, China University of Petroleum (East China), Qingdao, Shandong 266580, China. dfsun@upc.edu.cn.

Chemical Communications (Cambridge, England)

|July 2, 2026

Summary

This summary is machine-generated.

Researchers developed a novel metal-organic framework (MOF), UPC-115, for efficient separation of acetylene (C₂H₂) from carbon dioxide (CO₂). This MOF offers a promising solution for industrial gas purification challenges.

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Area of Science:

Materials Science
Chemical Engineering
Adsorption Science

Background:

Separating acetylene (C₂H₂) and carbon dioxide (CO₂) is challenging due to their similar physical and chemical properties.
Developing advanced adsorbents is crucial for efficient industrial gas separation processes.
Metal-organic frameworks (MOFs) offer tunable structures and high surface areas for gas adsorption applications.

Purpose of the Study:

To synthesize and characterize a novel three-dimensional Cu-MOF, designated UPC-115.
To investigate the potential of UPC-115 for selective acetylene (C₂H₂) over carbon dioxide (CO₂) separation.
To elucidate the structure-property relationships governing the adsorption and separation performance of the MOF.

Main Methods:

Synthesis of the MOF using 2-(1H-tetrazol-1-yl)terephthalic acid (H₂BDC-tetrazole) as a ligand.
Structural characterization using X-ray diffraction and other techniques.
Gas adsorption isotherm measurements, dynamic breakthrough experiments, and computational simulations.

Main Results:

A stable 3D Cu-MOF, UPC-115, featuring one-dimensional rhombic channels (6.6 Å × 5.4 Å) was successfully synthesized.
The tetrazole functionalization provided abundant adsorption sites and enhanced structural stability.
UPC-115 exhibited efficient C₂H₂/CO₂ separation performance, confirmed by adsorption isotherms, breakthrough curves, and simulations.

Conclusions:

UPC-115 demonstrates excellent potential as a selective adsorbent for acetylene (C₂H₂) and carbon dioxide (CO₂) separation.
The unique structural features and functionalization of UPC-115 contribute to its high separation efficiency.
This study highlights the promise of tailored MOFs for challenging industrial gas separation applications.