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Citation: Hongli CHEN, Ziling XU, Shiwen DU, Ting WANG, Liguang WU. Controlled preparation of HKUST-1 based on polyvinylpyrrolidone and CO2 separation performance of its doped mixed-matrix membranes[J]. Chinese Journal of Inorganic Chemistry, ;2026, 42(3): 571-583. doi: 10.11862/CJIC.20250263 shu

Controlled preparation of HKUST-1 based on polyvinylpyrrolidone and CO2 separation performance of its doped mixed-matrix membranes

  • School of Environmental Science and Engineering, Zhejiang Gongshang University, Hangzhou 310012, China

  • Corresponding author: Ting WANG,  Liguang WU, wulg64@mail.zjgsu.edu.cn
  • Received Date: 11 August 2025
    Revised Date: 16 December 2025

Figures(12)

  • Polyvinylpyrrolidone (PVP) was added during solvothermal synthesis to regulate the morphology and structure of HKUST-1 crystals, which were then in situ incorporated into a polyimide (PI) matrix to fabricate mixed matrix membranes (MMMs). The morphology and structure of the HKUST-1 crystals were characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), and nitrogen adsorption-desorption test. On the basis of CO2 adsorption experiments of HKUST-1, gas permeation measurements of the MMMs, and grand canonical Monte Carlo (GCMC) simulations, the effect of HKUST-1 crystal size on the CO2 permeation performance of the MMMs was investigated, and the mechanism by which PVP regulates the CO2 separation performance of MMMs was elucidated. The results showed that, owing to the steric hindrance effect of PVP, the HKUST-1 crystals synthesized with PVP exhibited an average particle size of 1-3 μm and a specific surface area of 731-1 007 m2·g-1. Compared with HKUST-1 crystals synthesized without PVP, their average particle size was significantly reduced with a narrower size distribution and a larger specific surface area, while more Cu2+ metal sites and aromatic ring structures were exposed. This enhances the interfacial compatibility between HKUST-1 and PI, as well as the π-π interactions and Lewis acid interactions between HKUST-1 and CO2. The MMM prepared by in situ incorporation of HKUST-1 (K30), whose synthesis was regulated by K30-type PVP with a dopping amount (mass fraction) of 3%, exhibited a CO2 permeability of 142.81 Barrer [1 Barrer=7.5×10-14 cm3(STP)·cm·cm-2·s-1·Pa-1] and a CO2/N2 selectivity of 25.05, which are 76 times and 18 times those of the pristine PI membrane, respectively. These results demonstrate that tailoring the morphology of HKUST-1 crystals via PVP is an effective approach to enhancing the CO2 separation performance of MMMs.
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