Carbon Hollow Fiber‐Supported Metal–Organic Framework Composites for Gas Adsorption

Abstract

Supporting metal–organic frameworks (MOFs) on scalable contactors such as hollow fibers provides a practical way to expedite their use in large‐scale industrial applications. Here, the development of carbon‐hollow‐fiber‐supported MOFs as adsorbent composites for gas separation processes is reported. Moreover, this work provides an effective approach for the growth of MOFs on the surface of carbon hollow fibers that are successfully produced by pyrolysis of cross‐linked Torlon hollow fibers. To fabricate MOF/carbon composites, the carbon hollow fibers are functionalized in different media to increase the surface hydroxyl groups prior to MOF growth. The MOF incorporation is performed by growing MOF‐74 and UTSA‐16 in the pores and on the outer surface of hollow fibers using dip‐coating and layer‐by‐layer techniques. The MOF/carbon composites with relatively high MOF loadings (37–38 %) and porous structures are successfully fabricated, yielding film thicknesses as high as 10–15 μm. The MOF‐74/carbon and UTSA‐16/carbon composites exhibit surface areas of 266 and 211 m2 g−1, and pore volumes of 0.28 and 0.20 cm3 g−1, respectively. As a proof‐of‐concept, the CO2 adsorption performances are evaluated and the MOF/carbon composites are shown to have relatively good CO2 adsorption capacities of 2.0 and 1.2 mmol g−1 for UTSA‐16 and MOF‐74, respectively, at room temperature and 1 bar.

Development of 3D-Printed Polymer-MOF Monoliths for CO2 Adsorption

“…Adsorption was terminated after 60 min. The calculations for fractional uptake can be found in our earlier work . The method reported by Pimentel et al was used to model the fractional uptakes and estimate the diffusion constants.…”

Binderless zeolite monoliths production with sacrificial biopolymers

“…The heating and cooling rates for each step were 10 • C/ min. The fractional uptakes were then calculated using a technique described in our previous work [31] and were modeled by varying the diffusivity to maximize the R 2 values, as detailed previously [32,33]. For reference, the equations used for modeling are shown in Equations S1-S3, Supporting Information.…”

Hollow Functional Materials Derived from Metal–Organic Frameworks: Synthetic Strategies, Conversion Mechanisms, and Electrochemical Applications

“…Due to their unique structural characteristics, such as uniform pore structures, atomic-level structural uniformity, tunable porosity, extensive varieties, and flexibilities in network topology, geometry, dimension, and chemical functionality, MOFs have received widespread attention for a variety of applications in many fields, such as gas storage and separation, liquid separation and purification, electrochemical energy storage, catalysis, and sensing. [27][28][29][30][31][32][33][34][35][36][37][38][39] In addition to direct applications, MOFs have been highlighted in recent years as unique precursors for the construction of inorganic functional materials with unrivaled design possibilities, such as carbons, metal-based compounds, and their composites. [40][41][42] Typically, the morphologies of MOFs are well preserved during the thermal transformation, and controlling the growth of the precursor MOFs has enabled various carbon materials to be fabricated, such as one-dimensional (1D) carbon nanorods, 2D graphene nanoribbons, and 3D hierarchical porous carbons.…”