Mixed Dimensional Nanostructure (UiO‐66‐Decorated MWCNT) as a Nanofiller in Mixed‐Matrix Membranes for Enhanced CO₂/CH₄ Separation

Abstract

Mixed-matrix membranes (MMMs) with combination of two distinct dimensional nanofillers (such as 1D-3D, 2D-3D, or 3D-3D, etc.) have drawn special attention for gas separation applications due to their concerted effects on gas permeation and mechanical properties. An amine-functionalized 1D multiwalled carbon nanotube (NH 2 -MWCNT) with exceptional mechanical strength and rapid gas transport was crosslinked with an amine-functionalized 3D metal-organic framework (UiO-66-NH 2 ) with high CO 2 affinity in a Schiff base reaction. The resultant crosslinked mixed-dimensional nanostructure was used as a nanofiller in a polysulfone (PSf) polymer matrix to explore the underlying synergy between 1D and 3D nanostructures on the gas separation performance of MMMs. Cross-sectional scanning electron microscopy and mapping revealed the homogenous dispersion of UiO-66@MWCNT in the polymer matrix. The MMM containing 5.0 wt. % UiO-66@MWCNT demonstrated a superior permeability 8.3 Barrer as compared to the 4.2 Barrer of pure PSf membrane for CO 2 . Moreover, the selectivity (CO 2 /CH 4 ) of this MMM was enhanced to 39.5 from the 28.0 observed for pure PSf under similar conditions of pressure and temperature.

A Review on SAPO‐34 Zeolite Materials for CO2 Capture and Conversion

“…[103] Numerous adsorbents have been reported for CO 2 capture, including zeolites, [93,95,104] ceramics, [105,106] carbonates, [107,108] metal and metal oxides, [24,25] carbonaceous materials, [100,109,110] amines, hydroxides, [111,112] polymers, [113,114] ionic liquids, [115] covalent organic frameworks, [116] and metal-organic frameworks (MOFs). [117][118][119][120][121][122][123][124][125][126][127] Acid-base neutralization reactions also play a key role in capturing CO 2 . CO 2 is acidic, whereas most of the other constituents (N 2 , H 2 O, and HCs) in the flue gas are neutral.…”

Studies on Structural Changes of Modified MWCNTs: Material for Electrochemical Monitoring of Antiviral Drug in Human Serum Samples

“…[4][5][6] Electrochemical detection based on solid-state electrochemistry has had incomparable usefulness in terms of large signal output and high sensitivity. [7][8][9] There are several conductive solid-state nanomaterials that have been employed for electrochemical monitoring, including metal-organic framework (MOF), [10] graphene, [7] carbon nanotubes (CNTs), [11][12][13] and metal oxides. [14] Among all, CNTs have drawn extensive attention owing to their high mechanical strength, high surface-to-volume ratio, high chemical stability, and extraordinary electrical and thermal conductivity for the construction of electrochemical nanomaterials.…”