Fabrication of Morphology-Tailored ZIF-67/Polyether- b -Amide Mixed Matrix Membranes via CTAB-Assisted Hydrothermal Synthesis for CO 2 and CO 2 /N 2 Separation
Year: 2025
Type: article
Abstract: High Resolution Image Download MS PowerPoint Slide The aim of this study was to evaluate the influence of particle morphology on the gas permeability and selectivity of poly(ether- block -amide) (PEBAX MH-1657)/zeolitic imidazolate framework-67 (ZIF-67) mixed-matrix membranes. ZIF-67 particles were synthesized using cetyltrimethylammonium bromide (CTAB) as a morphology modulator, and membranes were fabricated via solution casting followed by solvent evaporation. Single-gas permeability and ideal selectivity for carbon dioxide/nitrogen and carbon dioxide/methane were measured using a variable volume/constant pressure setup with a capillary flowmeter, at 10 and 15 bar and 35 °C. The mixed-matrix membranes exhibited enhanced permeability and selectivity; at 10 bar, they surpassed the Robeson upper bound for CO 2 /N 2 while approaching the bound for CO 2 /CH 4 . Maximum values obtained in this study were a CO 2 permeability of 236 Barrer (NC 1%, 15 bar), a CO 2 /N 2 selectivity of 110 (PL 5%, 10 bar), and a CO 2 /CH 4 selectivity of 27 (PL 1%, 15 bar). Gas permeation results indicated that both pressure and ZIF-67 loading strongly influenced performance, with optimal behavior at 10 bar. Differential scanning calorimetry revealed morphology-dependent modifications of PEBAX crystallinity and glass transition temperature, which contributed to the observed permeability–selectivity trade-offs under different pressures.
Source: ACS Omega
Institution: Universidade Federal do Paraná
Language: English
Subfield: Mechanical Engineering
Field: Engineering
Domain: Physical Sciences
Open Access status: gold
Estimated APC paid: $1,935
OpenAlex ID: W4416395477