Fabrication of Functionalized UiO-66 Anchored on Disorderly Layered Clinoptilolite via Surfactant-Assisted Induction for Selective Adsorption of CO₂ and CH₄

Abstract

The amine (NH2)-functionalized UiO-66 was successfully anchored on disorderly layered clinoptilolite (CP) via surfactant (poly(ethylene glycol) (PEG) and poly(vinylpyrrolidone) (PVP))-assisted induction. The structural features and physicochemical parameters of the resultant UiO-66-on-CPs were characterized by powder X-ray diffraction (XRD) patterns, scanning/transmission electron microscopy (SEM/TEM) images, Fourier transform infrared (FT-IR) spectra, N2 sorption isotherms, and small-angle X-ray scattering (SAXS) patterns. The results demonstrated that the growth of UiO-66-NH2 nanoparticles facilitated the disorder degree of the crystal plane of CP along the a-axis, while the addition of PEG in the hydrothermal synthesis system of CP was conducive to the formation of a flower-like microstructure and the introduction of PVP was beneficial to the nucleation and growth of UiO-66-NH2 nanoparticles with a small size (40 nm) on the surfaces of the obtained CP-PEG lamellas. Finally, the gas-selective adsorption and separation performances of CO2 and CH4 were evaluated using the synthesized disorderly layered UiO-66-on-CP heterostructures as adsorbents, indicating that the NH2-functionalized UiO-66-on-CP exhibited a superior selective factor (3.66) of CO2/CH4. These results elucidated that the proposed approach is a promising strategy for constructing MOF-on-zeolite heterostructures, which may open an avenue to expand CP application and improve their performance.

Superior Selective CO2 Adsorption and Separation over N2 and CH4 of Porous Carbon Nitride Nanosheets: Insights from GCMC and DFT Simulations

“…24−26 However, this is challenging for high CO 2 adsorption and selectivity at ambient temperature and pressure. 27 Notwithstanding many practical obstacles, recent advances have been achieved in the graphite slit, which possesses controllable interlayer distance and a highly accessible surface area. For instance, Sevilla et al 28 synthesized hydrothermal carbon materials with a high volume of narrow micropores that presented a high CO 2 capture capacity (7.4 mmol/g at 1 bar and 273 K).…”

“…Due to the urgent demand for CO 2 capture, diverse adsorbent materials have been continuously explored, such as porous activated carbons, − porous organic polymers, − metal–organic frameworks, − and carbon nitrogen materials. − However, this is challenging for high CO 2 adsorption and selectivity at ambient temperature and pressure . Notwithstanding many practical obstacles, recent advances have been achieved in the graphite slit, which possesses controllable interlayer distance and a highly accessible surface area.…”