Synergistic solution of CO₂ capture by novel lanthanide-based MOF-76 yttrium nanocrystals in mixed-matrix membranes

Abstract

A porous and thermally stable metal organic framework (MOF) of yttrium and 1,3,5-benzenetricarboxylate was synthesized, which belongs to the family of lanthanide-based MOF-76. Mixed-matrix membranes were developed by incorporating MOF-76 yttrium nanocrystals into Matrimid® 5218. The structure, composition, and morphology of synthesized lanthanide-based MOF-76 yttrium nanocrystals and mixed-matrix membranes were characterized by X-ray diffraction, Fourier-transform infrared spectroscopy, scanning electron microscopy, and thermogravimetric analysis. The characterizations and gas permeation results of the prepared mixed-matrix membranes confirmed better adhesion and distribution of filler particles in the polymer. The results demonstrated that the addition of MOF-76 yttrium nanocrystals to the polymer matrix improved both the gas selectivity and permeability of mixed-matrix membranes compared to pure Matrimid membranes. Permeability of CO2 increased from 7.24 to 27.29 Barrer by increasing the particle content from 0 to 30% in pure gas experiments. Whereas with 30 wt% concentration of MOF-76(Y) at 50:50 feed compositions, the selectivity increased for CO2/CH4 and CO2/N2 was 67% and 68%, respectively. The rise in temperature from 298 to 338 K decreased the ideal selectivity up to 25% for both gas pairs due to polymer chain relaxations at elevated temperatures. The commercial importance of membranes was evaluated at different feed compositions and operating temperatures.

Comparative study of air quality indices in the European Union towards adopting a common air quality index

“…The normalization procedure described in detail makes it possible to directly compare the AQIs and draw valuable conclusions towards a sustainable environment. 36…”

Strong Interplay between Polymer Surface Charge and MOF Cage Chemistry in Mixed-Matrix Membrane for Water Treatment Applications

“…Mixed-matrix membrane (MMM) filters combine the benefits of their different components, where the high processability and flexibility of the polymer matrix and porosity/functionality of the added filler interweave to produce the needed action in a functional membrane formulation. Recent reports demonstrated efficient synthetic pathways to construct freestanding or porous substrate-supported MOF membranes for gas separation and in battery applications, − as well as MOFs constructed on silica microparticles for fixed-bed water treatment. , However, to the best of our knowledge, a mixed-matrix membrane approach utilizing one of the most water-stable MOFs, the UiO-66-NH 2 , − to construct water-permeable, flexible membrane capable of removing both cationic and anionic pollutants from contaminated water stream is not yet fully explored. Despite earlier attempts for constructing MOF-containing membranes for water treatment, which proceeded mainly through (1) blending, (2) layer-by-layer (LBL) synthesis, (3) gelatin-assisted seed growth and, (4) in situ growth, none of such methods attained an optimized methodology to effectively blend the desirable mechanical properties of the polymer matrix and, at the same time, the microporosity of the MOF without adversely affecting both .…”

New Microporous Lanthanide Organic Frameworks. Synthesis, Structure, Luminescence, Sorption, and Catalytic Acylation of 2-Naphthol

“…MOFs designed with these ligands exhibit properties and functions that are attractive to researchers due to their rigidity and trifunctional identity [26][27][28]. Even though the BTBA and MTBA systems are at first glance quite similar, their geometries differ markedly.…”

“…Mesoporous MOFs consisting of M 6 nodes (M = Zr, Hf, Ce, Th) and MTBA as a tritopic linker have been prepared and used as supporting materials for a vanadium catalyst in the aerobic oxidation of 4-methylbenzyl alcohol [32]. Coordination geometry flexibility and high coordination numbers make lanthanide-based MOFs a promising class of porous materials with useful properties such as luminescence, thermal stability, magnetism, and catalytic behavior [26,[33][34][35][36]. MTBA possesses intrinsic fluorescence.…”

“…Coordination geometry flexibility and high coordination numbers make lanthanide-based MOFs a promising class of porous materials with useful properties such as luminescence, thermal stability, magnetism, and catalytic behavior [ 26 , 33 , 34 , 35 , 36 ]. MTBA possesses intrinsic fluorescence.…”