Review: Mixed-Matrix Membranes with CNT for CO2 Separation Processes

Pacheco, Marquidia; Vences, Luis J; Moreno, Hilda; Pacheco, J.; Valdivia, Ricardo; Hernández, Celso A.

doi:10.3390/membranes11060457

Cited by 18 publications

(6 citation statements)

References 103 publications

(104 reference statements)

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“…They can have diameters in the range of 2 to 100 nm, but lengths of tens of microns. [ 73 ] In the current lattice models, each slit pore element is a domain, and it would correspond to a fragment of the carbon nanotube in experimental systems. The current systems overemphasize the interfacial effect because the domains are small in scale leading to the high surface‐to‐volume ratio of the dispersed phase.…”

Section: Discussionmentioning

confidence: 99%

Lattice Model of Fluid Transport in Mixed Matrix Membranes

Yuan

Sarkisov

2022

Advcd Theory and Sims

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This work offers a computationally efficient theoretical framework to investigate transport phenomena in complex systems such as mixed matrix membranes (MMMs). It is demonstrated here that a wide variety of heterogeneous, disordered geometries can be constructed using lattice models. These geometries combined with the dynamic mean field theory (DMFT) provide useful insights on the distribution of density and flux in the structures. From this work, the DMFT emerges as a theoretical playground to explore transport phenomena in MMMs under a variety of conditions and probe some of the assumptions involved in the commonly used macroscopic models. As a case study, a comparison of the predictions of the DMFT is considered with several classical macroscopic theories. In the preliminary observations, the study points to a much greater impact of the pore blocking effects on the overall transport of the composite system in comparison with the macroscopic models.

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Section: Discussionmentioning

confidence: 99%

Lattice Model of Fluid Transport in Mixed Matrix Membranes

Yuan

Sarkisov

2022

Advcd Theory and Sims

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“…These materials classify MMMs in three categories as liquid–polymer, solid–polymer, and solid–liquid polymer MMMs. The fabrication of solid-polymer MMMs has drawn interest in recent years . Solid fillers incorporating polymer matrix MMMs can be traditional (such as carbon molecular sieves (CMSs), silicas, and zeolites) or novel (such as carbon nanotubes (CNTs), metal–organic frameworks (MOFs), graphene oxides (GO), spherical materials, layered materials, or delaminated materials).…”

Section: Membranes Used For Co2 Separationmentioning

confidence: 99%

Mixed Matrix Membranes for Carbon Capture and Sequestration: Challenges and Scope

et al. 2023

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Carbon dioxide (CO 2 ) is a major greenhouse gas responsible for the increase in global temperature, making carbon capture and sequestration (CCS) crucial for controlling global warming. Traditional CCS methods such as absorption, adsorption, and cryogenic distillation are energy-intensive and expensive. In recent years, researchers have focused on CCS using membranes, specifically solution-diffusion, glassy, and polymeric membranes, due to their favorable properties for CCS applications. However, existing polymeric membranes have limitations in terms of permeability and selectivity trade-off, despite efforts to modify their structure. Mixed matrix membranes (MMMs) offer advantages in terms of energy usage, cost, and operation for CCS, as they can overcome the limitations of polymeric membranes by incorporating inorganic fillers, such as graphene oxide, zeolite, silica, carbon nanotubes, and metal−organic frameworks. MMMs have shown superior gas separation performance compared to polymeric membranes. However, challenges with MMMs include interfacial defects between the polymeric and inorganic phases, as well as agglomeration with increasing filler content, which can decrease selectivity. Additionally, there is a need for renewable and naturally occurring polymeric materials for the industrial-scale production of MMMs for CCS applications, which poses fabrication and reproducibility challenges. Therefore, this research focuses on different methodologies for carbon capture and sequestration techniques, discusses their merits and demerits, and elaborates on the most efficient method. Factors to consider in developing MMMs for gas separation, such as matrix and filler properties, and their synergistic effect are also explained in this Review.

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“…Different types of inorganic additives have been investigated as filler materials . Carbon nanotubes (CNTs) are one of the most investigated nanomaterials based on their smooth inner/outer walls, open ends, and unique tubular morphology with a high aspect ratio . This special structural property enables the CNT-containing composite membrane materials to achieve many superior characteristics and performance, like high-efficiency mass transfer, strong hydrophobicity, and excellent mechanical properties. − Therefore, MMMs composed of carbon nanotubes have already been intensively studied and widely applied to gas separation and water purification.…”

Section: Introductionmentioning

confidence: 99%

Fabrication and Characterization of Carbon Nanotube Filled PDMS Hybrid Membranes for Enhanced Ethanol Recovery

Tian

et al. 2023

ACS Appl. Mater. Interfaces

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Ethanol separation via the pervaporation process has shown growing application potential in solvent recovery and the bioethanol industry. In the continuous pervaporation process, polymeric membranes such as hydrophobic polydimethylsiloxane (PDMS) have been developed to enrich/ separate ethanol from dilute aqueous solutions. However, its practical application remains largely limited due to the relatively low separation efficiency, especially in selectivity. In view of this, hydrophobic carbon nanotube (CNT) filled PDMS mixed matrix membranes (MMMs) aimed at high-efficiency ethanol recovery were fabricated in this work. The filler K-MWCNTs was prepared by functionalizing MWCNT-NH 2 with epoxycontaining silane coupling agent (KH560) to improve the affinity between fillers and PDMS matrix. With K-MWCNT loading increased from 1 wt % to 10 wt %, membranes showed higher surface roughness and water contact angle was improved from 115°to 130°. The swelling degree of K-MWCNT/ PDMS MMMs (2 wt %) in water were also reduced from 10 wt % to 2.5 wt %. Pervaporation performance for K-MWCNT/PDMS MMMs under varied feed concentrations and temperatures were evaluated. The results supported that the K-MWCNT/PDMS MMMs at 2 wt % K-MWCNT loading showed the optimum separation performance (compared with pure PDMS membranes), with the separation factor improved from 9.1 to 10.4, and the permeate flux increased by 50% (40−60 °C, at 6 wt % feed ethanol concentration). This work provides a promising method for preparing a PDMS composite with both high permeate flux and selectivity, which showed great potential for bioethanol production and alcohol separation in industry.

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Review: Mixed-Matrix Membranes with CNT for CO2 Separation Processes

Cited by 18 publications

References 103 publications

Lattice Model of Fluid Transport in Mixed Matrix Membranes

Lattice Model of Fluid Transport in Mixed Matrix Membranes

Mixed Matrix Membranes for Carbon Capture and Sequestration: Challenges and Scope

Fabrication and Characterization of Carbon Nanotube Filled PDMS Hybrid Membranes for Enhanced Ethanol Recovery

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