Simultaneous enhancement of flux and selectivity of UiO-66 membranes for pervaporation via post-synthetic defect healing

• Published in: Journal of membrane science 2025-02, Vol.716, p.123535, Article 123535
• Main Authors: Liang, Ye, Zhang, Bo, Wu, Langhui, Jiang, Kangkang, Wang, Zhi, Liu, Xinlei
• Format: Article
• Language: English
• Subjects: Alcohol/ether separation; Defect-regulation; Metal-organic framework membrane; Pervaporation; UiO-66
• ISSN: 0376-7388
• DOI: 10.1016/j.memsci.2024.123535

Zirconium-based metal-organic framework (Zr-MOF) UiO-66 is widely recognized as an exceptional candidate for fabricating high-performance membranes owing to its rich porosity, customizable chemistry and remarkable stability. However, exploration of accessible zirconium sources for UiO-66 membrane fabrication is not enough and eliminating the undesired defects occurring during synthesis is also imperative. In this work, 1.3 μm thick UiO-66 polycrystalline membranes were successfully fabricated using ZrOCl2·8H2O as the sole metal source. The undesired lattice defects were controlled at a low concentration level through utilizing post-synthetic defect healing method, leading to simultaneous enhancement of flux and separation factor of UiO-66 membranes for pervaporation test as the competitive permeation between different penetrants was reduced to a large extent. The finally obtained UiO-66 membranes exhibited exceptional performance, with the separation factor of around 10,000 for alcohol/ether separation, showing good potential for applying in industrial production processes. [Display omitted] •UiO-66 membranes exhibited simultaneous enhancement of flux and selectivity via defect healing.•A novel synthesis route was proposed for fabricating UiO-66 membranes.•The membranes exhibited excellent performance for alcohol/ether separation.