SIFSIX-3-Zn/PIM-1 mixed matrix membranes with enhanced permeability for propylene/propane separation

Shen, Qin; Cong, Shenzhen; He, Rong‐Rong; Wang, Zheng; Jin, Yehao; Li, Hui; Cao, Xingzhong; Wang, Jing; Bruggen, Bart Van der; Zhang, Yatao

doi:10.1016/j.memsci.2019.117201

Cited by 52 publications

(15 citation statements)

References 58 publications

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“…In polymeric membranes, there is a tradeoff between permeability and selectivity due to the nature of the polymer [1]. Mixed-matrix membranes can overcome this limitation by adding fillers of another material to the polymer during the membrane preparation [65]. XRD can be beneficial for studying the effect of adding the fillers to the polymer matrix.…”

Section: Data Interpretationmentioning

confidence: 99%

Microscopy and Spectroscopy Techniques for Characterization of Polymeric Membranes

Alqaheem

Alomair

2020

Membranes

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Polymeric membrane is a proven technology for water purification and wastewater treatment. The membrane is also commercialized for gas separation, mainly for carbon dioxide removal and hydrogen recovery. Characterization techniques are excellent tools for exploring the membrane structure and the chemical properties. This information can be then optimized to improve the membrane for better performance. In this paper, characterization techniques for studying the physical structure such as scanning electron microscopy (SEM), transmission electron microscopy (TEM), and atomic force microscopy (AFM) are discussed. Techniques for investigating the crystal structure such as X-ray diffraction (XRD), small-angle X-ray scattering (SAXS), and wide-angle X-ray scattering (WAXS) are also considered. Other tools for determining the functional groups such Fourier transform infrared spectroscopy (FTIR), Raman spectroscopy, and nuclear magnetic resonance (NMR) are reviewed. Methods for determining the elemental composition such as energy-dispersion X-ray spectroscopy (EDS), X-ray fluorescent (XRF), and X-ray photoelectron spectroscopy (XPS) are explored. The paper also gives general guidelines for sample preparation and data interpretation for each characterization technique.

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Section: Data Interpretationmentioning

confidence: 99%

Microscopy and Spectroscopy Techniques for Characterization of Polymeric Membranes

Alqaheem

Alomair

2020

Membranes

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“…To simplify the analysis, the micro‐cavities in the copolymers were assumed to be spherical, as reported in the other studies. The ortho‐positronium (o‐Ps) lifetime ( τ 3 and τ 4 ) which were related to free volume radius ( R ) were calculated with a semi‐empirical equation based on a spherical‐cavity model as follows 15,21,22 :

τ_{i} = 0.5 {[1 - \frac{R_{i}}{R_{i} + 1.66} + \frac{1}{2 π} \sin (\frac{2 π R_{i}}{R_{i} + 1.66})]}^{- 1}; i = 3, 4,

where τ i and corresponding R i were expressed in the units of ns and Å , respectively.…”

Section: Methodsmentioning

confidence: 99%

“…The PALS experiments were carried out with a fastfast coincidence ORTEC system with a time resolution of 200 ps at 25 C. A 30 μCi source of 22 Na was sandwiched between two identical disk samples (1 mm thick), and a total count of 3 million was collected. All the spectra were analyzed with the LIFETIME 9.0 program.…”

Section: Characterization Of Pdd-tfe Copolymersmentioning

confidence: 99%

Free volume characteristics of 2,2‐bistrifluoromethyl‐4,5‐difluoro‐1,3‐dioxole‐co‐tetrafluoroethylene copolymers: Effect of composition and molecular weight

Mao

Cai

et al. 2021

Journal of Polymer Science

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2,2‐bistrifluoromethyl‐4,5‐difluoro‐1,3‐dioxole‐co‐tetrafluoroethylene (PDD‐TFE) copolymer is a good candidate to prepare gas separation membranes with excellent permeability due to its free volume characteristics. However, the influence of PDD‐TFE copolymer structure on its free volume characteristics is less studied. In this paper, PDD‐TFE copolymers with different compositions and molecular weights were synthesized, and their free volume characteristics were analyzed by positron annihilation lifetime spectroscopy and a molecular dynamics simulation. It indicated that the molar fraction of PDD in copolymers had a significant effect on free volume characteristics, while the molecular weight of copolymers exerted a slight influence on free volume when the molecular weight exceeded a critical region (intrinsic viscosity [η] > 68 ml g−1). PDD‐TFE copolymers with greater PDD molar fractions (i.e., 72% and 84%) showed bimodal distributions in positron lifetime and free volume size distributions, while PDD‐TFE copolymers with lower PDD molar fractions (i.e., 27% and 35%) exhibited a single peak. The long‐lifetime parameter τ3 was assigned to micro‐cavities formed by [‐(TFE)y‐PDD‐] segments and τ4 was attributed to micro‐cavities formed by [‐(PDD)x‐TFE‐] segments. The cis and trans transitions of PDD led to a local multilayer spiral structure with a 2.6–4.3 Å layer spacing, which would also increase the free volume of copolymers.

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“…SIFSIX‐1‐Cu, which was first reported in 2000, [12, 13] belongs to a broad family of SIFSIX in which two‐dimensional nets of 4,4’‐bipyridine and divalent copper ion nodes are pillared with SiF 6 2− anions to construct three‐dimensional coordination networks. To date, these novel MOFs have been widely investigated because of their structural diversity and microporous nature for CH 4 adsorption, [12] CO 2 adsorption [14] and separation, [15] acetylene/ethylene separation, [16] propyne/propadiene separation, [17] propane/propylene separation, [18] and water vapor adsorption [19] . More recently, SIFSIX‐1‐Cu and its isomorph ZU‐61 have been proven to have unique m ‐xylene/ p ‐xylene selectivity in xylene gas phase separation [20] .…”

Section: Figurementioning

confidence: 99%

Separation of Xylene Isomers in the Anion‐Pillared Square Grid Material SIFSIX‐1‐Cu

Yang

Liu

Xing

et al. 2021

Chemistry A European J

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Xylene isomer separation is considered one of the seven separation challenges that changed the world. In addition, the high‐energy demand of xylene separation highlights the need for efficient novel adsorbents. Herein, the liquid‐phase separation potential of the anion‐pillared hybrid material SIFSIX‐1‐Cu was studied for preferential adsorption of o‐xylene and m‐xylene over p‐xylene, which was inspired by a previous complexation crystallization method for separating m‐xylene. We report detailed experimental liquid‐phase adsorption experiments, yielding selectivities of 3.0 for o‐xylene versus p‐xylene and 2.6 for m‐xylene versus p‐xylene. Our theoretical calculations thus provide a reasonable explanation that the xylene adsorption selectivity is attributed to the C−H⋅⋅⋅F interaction, and the host–guest interaction order agrees with the adsorption priority: o‐xylene > m‐xylene > p‐xylene.

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SIFSIX-3-Zn/PIM-1 mixed matrix membranes with enhanced permeability for propylene/propane separation

Cited by 52 publications

References 58 publications

Microscopy and Spectroscopy Techniques for Characterization of Polymeric Membranes

Microscopy and Spectroscopy Techniques for Characterization of Polymeric Membranes

Free volume characteristics of 2,2‐bistrifluoromethyl‐4,5‐difluoro‐1,3‐dioxole‐co‐tetrafluoroethylene copolymers: Effect of composition and molecular weight

Separation of Xylene Isomers in the Anion‐Pillared Square Grid Material SIFSIX‐1‐Cu

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