Journal
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
Volume 9, Issue 8, Pages 3195-3202Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acssuschemeng.0c08256
Keywords
Molecular sieving; Metal-organic frameworks; Separation; Water; Ethanol; Chemical stability
Categories
Funding
- National Natural Science Foundation of China [22038010, 21878229, 21978212]
- Science and Technology Plans of Tianjin [19PTSYJC00020, 20ZYJDJC00110]
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The Cu-triazole metal-organic framework (Cu-Tria) is identified as an effective adsorbent for ethanol purification from ethanol/water mixtures. It shows ideal molecular sieving effect and excellent stability for water/ethanol separation, achieving complete separation with high purity of collected ethanol.
Purification of ethanol from ethanol/water mixtures is important in industrial separation processes, especially for bioethanol fuel purification. In this work, a robust Cu-triazole metal-organic framework (Cu-Tria) with interconnected 3D supermicroporous channels containing tridentate bridging triazole ligands and rich open Cu' sites was identified to separate ethanol/water mixtures. By virtue of the size exclusion effect for ethanol and excellent water affinity, this MOF exhibits an ideal molecular sieving effect for ethanol/water separation. The DFT calculation results reveal that a water molecule can form coordination bonds with Cu2+ open metal sites, and the subsequent water molecules can form multiple hydrogen bonds with the coordinated water. Breakthrough experiments of water/ethanol mixtures (v/v = 5/95) show that complete water/ethanol separation can be achieved, and online mass spectrometry results reveal that the purity of the collected ethanol from the outlet is up to 99.99%. More importantly, this MOF displays excellent water, alkali, and acid stability, as well as outstanding recyclability for water/ethanol separation. Consequently, the Cu-Tria can be deemed as a potential porous adsorbent for the purification of bioethanol fuel.
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