Design and Gas Separation Performance of Imidazolium Poly(ILs) Containing Multivalent Imidazolium Fillers and Crosslinking Agents

Chen

et al. 2023

Ind. Eng. Chem. Res.

Poly(ionic liquid) (PIL)-based membranes for CO2 removal attract increased interest due to the tunability of their chemical structure and processability of polymers. In this work, the IL cation of 1-vinylimidazole was selected as the polymeric backbone to connect the cyano- and carboxyl-based side chains to explore their effects. The synthesized PILs were blended with polyacrylamide (PAM) to prepare composite membranes by coating the mixed solutions on polysulfone (PSF) membranes. The CO2 permeance and CO2/N2 selectivity of these prepared PIL-based membranes were tested to evaluate their CO2 separation performance. The results demonstrate that the cyano-based side chain showed better CO2 separation performance compared to a carboxyl-based side chain of PILs. The best membrane performance for CO2 permeance increased by 200% and CO2/N2 selectivity increased by 195%. Here, the prepared PIL-based membranes provide a potential prospect for improving the CO2 separation performance by adjusting the chemical structure of PILs. However, optimization related to cation, anion, and side chain groups should be conducted to break through the CO2/N2 separation performance for industrial carbon capture.

“…Position of PIL-based membranes on the Robeson plot for CO 2 /N 2 separation. The membranes in regions A and B show the other PIL-based membranes reported in recent years. − …”

Section: Resultsmentioning

confidence: 95%

CO₂-Philic Imidazolium-Based Poly(Ionic Liquid) Composite Membranes for Enhanced CO₂/N₂ Separation

Chen

et al. 2023

Ind. Eng. Chem. Res.

“…How to make environmentally friendly cellulose acetate/graphene oxide nanocomposite adsorbents for usage in extracting Ni 2+ from wastewater using environmental applications was investigated [32]. The flexible membrane ingredients of vinyl-imidazolium-based polyelectrolyte composites were structurally improved by being soaked with multivalent imidazoliumbenzene ionic liquids or crosslinked with novel cationic crosslinkers that have interior imidazolium cations and vinyl-imidazolium cations at the border to aid the discrimination and simplification of CO 2 absorption through the film [33].…”

Section: Introductionmentioning

confidence: 99%

Multi-Walled Carbon Nanotubes Functionalized with Hydroxamic Acid Derivatives for the Removal of Lead from Wastewater: Kinetics, Isotherm, and Thermodynamic Studies

Al-Faiyz

Gouda

2022

Polymers

Hydroxamic acids are recognized chelators for various metals; however, using them as functional groups on carbon nanotubes (CNTs) is rare. In this study, novel multi-walled carbon nanotubes (MWCNTs) functionalized with hydroxamic acid derivatives were developed. The MWCNTs were first oxidized, and the resulting product, MWCNT-COOH (A), was treated with oxalyl chloride to yield MWCNT-COCl. The functionalized MWCNTs were susceptible to reacting with the hydroxylamine derivatives of type R–NHOH and produced MWCNTs functionalized with the following hydroxamic acid derivatives (MWCNT-HA): MWCNT-CONOHMe (B), MWCNT-CONOHCOMe(C), and MWCNT-CONOHPh (D). The synthesized derivatives were confirmed by various techniques such as scanning electron microscopy, X-ray photoelectron spectroscopy, and Raman spectroscopy. In order to examine their chelation ability, these materials were examined as possible new adsorbents for harmful Pb(II) particles. The adsorption efficiency of the functionalized MWCNT adsorbents toward Pb(II) was investigated. The effects of the adsorbent dose, temperature, pH, and time on adsorption efficiency were considered, and adsorption boundaries that resulted in enhanced effectiveness were obtained. The developed materials were found to have extraordinary coordination sites, such as amine, hydroxyl, and carboxyl groups, which served as excellent chelating specialists for the Pb(II) particles. Thermodynamic and kinetic investigations revealed the unconstrained nature of the adsorption of Pb(II) by the developed MWCNT adsorbents at room temperature. The adsorption was noted to follow the pseudo-second-order and Langmuir isotherm models.

High Performance Polymers

“…Due to the good interphase compatibility with polymeric membrane, functional polymer-based fillers have received much attention. 33,34 In addition, polyimides containing bulky CF 3 group for gas separation were investigated. 35,36 The bulky CF 3 groups could efficiently inhibit polymer chain packing and reduce local segment mobility.…”

Section: Introductionmentioning

confidence: 99%

A polyimide/poly(N-vinylimidazole) membrane for CO₂/CH₄ separation with high selectivity and permeability

Yan¹,

Yu²,

Chen³

2022

Membranes with both good permeation and selectivity are highly desired for gas separations. In this study, we synthesized a new 6FDA-type polyimide copolymer 6FDA-BDTA-ODA, and then an organic polymer of poly ( N-vinylimidazole) was doped into the polyimide to prepare mixed matrix membranes (MMMs). We also studied the effect of poly ( N-vinylimidazole) contents on the separation performance of MMMs. The results showed that the ideal selectivity for CO2/CH4 was improved by adding the poly ( N-vinylimidazole) filler. The ideal selectivity reached 63.5 with 6 wt% poly ( N-vinylimidazole) loading with the permeability of 29.2 Barrer. The highly permeable MMMs showed a considerably enhanced performance for CO2/CH4 that close to the 2008 Robeson upper-bound. The gas separation performance of the prepared MMMs for CO2/CH4 was improved compared to that of the pure polymer membrane, indicating that the copolyimide/poly ( N-vinylimidazole) MMMs have promising applications in CO2/CH4 gas separation.