Synthesis, Characterization and NH3/N2 Gas Permeation Study of Nanocomposite Membranes

Abstract

Carbon nanotubes have exceptional mechanical properties which make them very attractive for the development of composite membranes. In this research, NH 3 /N 2 gas permeation behavior of flat sheet composite membranes was examined. The cellulose acetate-multiwalled carbon nanotubes composite membranes were synthesized using solution casting method. The morphology and dispersion of carbon nanotubes were observed through SEM. However, the composite membranes were also characterized using several analytical techniques such as X-ray diffraction analysis, tensile testing analysis, and thermal gravimetric analysis. Characterization of these membranes depicted that carboxylic group functionalized MWCNTs are extremely compatible with CA. The permeation experiments were performed with NH 3 and N 2 to explore the host-guest interaction of MWCNTs with chosen gases. The permeability of NH 3 was found pronounced compared to N 2 . The NH 3 /N 2 selectivity up to 90 was documented.

Advanced Materials for NH3 Capture: Interaction Sites and Transport Pathways

“…Mixed matrix membranes (MMMs) have attracted increasing attention for NH 3 separation in recent years because of the synergistic effect of both polymer and porous components [ 198 – 200 ]. Raza et al [ 201 ] introduced carboxylic group-functionalized multiwall carbon nanotubes (COOH-MWCNTs) into a CA/PEG polymer matrix, which notably increased the permeability of NH 3 and N 2 owing to the enhanced voids and free volume. In addition, HKUST-1/PVDF MMMs were exploited by Cohen et al [ 202 ] because HKUST-1 can bind with ammonia via Lewis acid–base interactions.…”

The influence of polymer concentration on the morphology and mechanical properties of asymmetric polyvinyl alcohol (PVA) membrane for O2/N2 separation

“…The analysis was recorded at different magnifications of 500X to 10,000X, whereas the 10 kV voltage was used in the process. 20,21 Membrane Porosity Measurement Analysis…”

Exploring NH3 Transport Properties by Tailoring Ionic Liquids in Pebax-Based Hybrid Membranes

“…The development of ILs with outstanding features also provides opportunities to design novel materials for gas separation like porous materials and membranes. , In particular, membrane technology is one prospective candidate compared with other energy-extensive separation approaches. , Polymers such as cellulose acetate, fluorinated polymers, and block copolymers were applied for preparing NH 3 separation membranes, of which block copolymers showed superior performance. − For example, Makhloufi et al studied NH 3 separation performance of fluorinated membranes, but the selectivities were not satisfying. Later, Ansaloni et al developed sulfonated block copolymer membranes with tuned microstructures, and the membrane primarily consisting of lamellae exhibited NH 3 permeability of 473 Barrer and NH 3 /N 2 selectivity of 591.…”