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Abstract
Abstract This work focuses on dip coating and further phase inversion prepared polysulfone/LTA zeolite mixed matrix membranes (MMMs). The Linde Type A (LTA) zeolite synthesized under hydrothermal conditions by the organic free method was introduced as fillers at 10 and 20 wt.% loadings into the polysulfone polymer matrix to obtain MMMs. The x-ray diffraction (XRD) and scanning electron microscopy (SEM) analysis indicated that the as-synthesized LTA zeolite samples were crystalline and mainly composed of crystal of predominantly cubic shape. Textural characterisation using Ar adsorption/desorption data of LTA zeolite shown the existence of mesoporous. Atomic force microscopy (AFM) in combination with the SEM characterised the membrane morphology and the dispersion of zeolite fillers. The effect of the zeolite loading on the performance of the MMMs was analysed. It points out that N2 permeability was increased with the increment of zeolite filler, also the high membranes permeability and the weak dependence upon transmembrane pressure and therefore its high selectivity. The average membrane thickness was 150 μm.
Highlights
This work focuses on dip coating and further phase inversion prepared polysulfone/Linde Type A (LTA) zeolite mixed matrix membranes (MMMs)
The x-ray diffraction (XRD) and scanning electron microscopy (SEM) analysis indicated that the as-synthesized LTA zeolite samples were crystalline and mainly composed of crystal of predominantly cubic shape
The LTA zeolite powders were characterized by XRD using an Advance Bruker D8 diffractometer (CuKα radiation at 40KV and 30mA, 2θ range from 5∘ to 50∘, step size of 0.05, room temperature), for confirming the final phases developed during the present study as well as the degree of zeolite powders crystallinity
Summary
Abstract: This work focuses on dip coating and further phase inversion prepared polysulfone/LTA zeolite mixed matrix membranes (MMMs). Zeolite membranes is still a challenge nowadays because their fragile structures make the development of large-scale inorganic membranes hard, especially to produce reliable defect-free membrane and costeffective fabrication processes [7]. The first research about mixed matrix membranes (MMMs) was developed around 1970 with the addition of 5A zeolite as fillers into the polymeric matrix showing the best gas separation performance in comparison to organic membranes made by polymer as a single-phase [12]. Synthetic zeolite as the dispersed phase is the most inorganic materials used as fillers into the MMMs, improving the possibilities of this system for gas separations [11], but only the membrane modification processes allow to eliminate or reduce the compatibility lack in the interphase between zeolite particles and polymer chains [13]. The physical and chemical properties of the zeolite and the resultant membranes were studied using different characterisation techniques, including the analysis of the influence of zeolite content on the MMMs and the final membrane performance under 1-6 bar N2 transmembrane pressure difference
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