Graphene Oxide/Single-Walled Carbon Nanotube Membranes for CO₂ and N₂ Separation from Blast Furnace Gas

Abstract

A novel molecular sieve membrane was synthesized using graphene oxide/single-walled carbon nanotubes (GO/SWCNTs). The composite was characterized by transmission electron microscopy, field emission scanning electron microscopy, X-ray diffraction, thermogravimetric analysis, Fourier transform infrared spectroscopy, and Brunauer–Emmett–Teller-specific surface area analyzers. The results revealed that laminar GO was interwoven with tubular SWCNTs and the carbon nanotubes were attached onto the surface of GO or interspersed among GO to form a three-dimensional structure. Moreover, the interlayer spacing of GO/SWCNTs increased to 0.826 nm. On condition that the inlet pressure of N2 was 0.10 MPa and the temperature was 323 K, the N2 permeability of GO/SWCNTs was 1595 Barrer. With increasing temperature, the N2 permeability decreased while it increased with the inlet pressure. When the inlet pressure of CO was 0.10 MPa and the temperature was 323 K, the CO permeability was 109 Barrer. At the temperature of 323 K, the selectivities of N2/CO and CO2/CO were 32.8 and 37, respectively. These results indicated that GO/SWCNTs may be a promising molecular sieve for gas separation.

Morphology Effect of Zinc Oxide Nanoparticles on the Gas Separation Performance of Polyurethane Mixed Matrix Membranes for CO2 Recovery from CH4, O2, and N2

“…MMMs can be filled with a variety of inorganic materials, such as metal oxides [20][21][22][23][24][25], metal organic frameworks (MOFs) [26][27][28][29][30], carbon molecular sieves (CMS) [31][32][33][34][35], carbon nanotubes (CNTs) [36][37][38][39][40], and zeolites [15,[41][42][43]. Nevertheless, regardless of a filler type, the manufacture of MMMs is often associated with a number of difficulties, such as agglomeration of inorganic fillers, their sedimentation and insufficient dispersion [7].…”

MIL‐101(Cr) Microporous Nanocrystals Intercalating Graphene Oxide Membrane for Efficient Hydrogen Purification

“…Although many strategies have been proposed to manipulate the interlayer channels of GO membrane, the tortuous transport pathways usually lead to low gas permeability, [17] which could not meet the demand for separation performance. To accelerate the gas permeation through GO membranes, intercalation of nanomaterials, including carbon nanotubes [18] and metal-organic framework (MOF) nanocrystals, [19] into GO membrane has been explored to enlarge the interlayer spacing. The size of MOF nanocrystals can be reduced to tens of nanometers, and the porous framework with tunable functional groups can provide gas transport channels and form specific interaction with gas molecules, contributing to enhanced gas separation performance.…”