Opportunities and challenges of MOF-based membranes in gas separations

Adatoz, Elda; Avcı, Ahmet K.; Keskin, Seda

doi:10.1016/j.seppur.2015.08.020

Cited by 261 publications

(133 citation statements)

References 234 publications

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“…Particle aggregates could be seen in all MMMs despite the different fillers that has been utilised. The presence of particle agglomerations is detrimental to the performance of the membrane in the separation of gases as it may lead to the formation of undesirable channels across the polymer increasing its gas permeability but not selectivity [30,31]. Also, mechanical strengths of the membrane may be compromised with the presence of agglomerations as it creates more stress convergent points subjected to external forces [32].…”

Section: Resultsmentioning

confidence: 99%

The effect of amine substituent chain length on POSS/Polysulfone mixed matrix membrane

Bong¹,

Oh²,

Chew³

2018

J. MECH. ENG. SCI.

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The main obstacle encountered during the development of polyhedral oligomeric silsesquioxane (POSS) mixed matrix membrane (MMM) via physical blending is the combination of compatible inorganic filler and polymeric matrix. In this work, mono-functional POSS of different amine functionalised substituent chain lengths namely aminopropylisobutyl POSS (AMPOSS-a) and aminoethylaminopropylisobutyl POSS (AMPOSS-b) were incorporated into Polysulfone (PSf) membrane at 1wt%, 2wt% and 3wt% loadings. The effect of amine substituent chain lengths on its compatibility and dispersion properties as well as the glass transition temperature of the MMMs were studied using scanning electron microscope (SEM), energy dispersive X-ray (EDX) and differential scanning calorimeter (DSC). Particle agglomerations were observed to increase with the loadings of both fillers although more prominent in AMPOSS-b/PSf membranes. This was attributed to the interparticle forces such as van der Waals and electrostatic forces. Distribution of both fillers were concentrated at the upper region of the membranes at 1wt% and 2wt% as a consequence of their density difference. The glass transition temperature (T g ) for pristine PSf at 197ºC showed an overall decrement between 40.3ºC to 47.1ºC when AMPOSS-a and AMPOSS-b were incorporated. The decrement was due to AMPOSS particle loadings, surface chemistry and particle-polymer chain topology. Hence, mono-substituted POSS with varying amine substituent chain lengths did not improve the glass transition temperature nor contribute to homogeneous MMM morphology. This had been identified to be the consequence of POSS surface energy, which might be caused by the association of hydrocarbon chains saturated on the particle surface due to the presence of isobutyl group.

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Section: Resultsmentioning

confidence: 99%

The effect of amine substituent chain length on POSS/Polysulfone mixed matrix membrane

Bong¹,

Oh²,

Chew³

2018

J. MECH. ENG. SCI.

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“…Several experiments showed that MOFs can be highly CO2 selective membranes (Adatoz et al, 2015). Considering the experimental challenges in fabricating thin-layer membranes from new materials and long time requirements of membrane testing, identification of promising MOF membranes using computer simulations will greatly contribute in directing experimental efforts.…”

Section: Membrane Simulationsmentioning

confidence: 99%

“…They have exceptional physical properties such as very large surface areas [the highest reported one with 6,411 m 2 /g (Grunker et al, 2014)], high pore volumes (1-4 cm 3 /g), a large variety of pore sizes, and good stabilities. MOFs have been used in a wide range of chemical applications (Mueller et al, 2006) including gas storage and gas separation (Sun et al, 2013;Zornoza et al, 2013;Adatoz et al, 2015;, catalysis (Gascon et al, 2014), sensing (Zhu et al, 2013;Muller-Buschbaum et al, 2015), drug storage, and delivery (Della Rocca et al, 2011;Keskin and Kizilel, 2011;Bag et al, 2016). Gas separation has been the most widely examined application since MOFs offer a large variety in their pore sizes, shapes and chemistries.…”

Section: Introductionmentioning

confidence: 99%

High-Throughput Molecular Simulations of Metal Organic Frameworks for CO2 Separation: Opportunities and Challenges

Eruçar

Keskın

2018

Front. Mater.

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Metal organic frameworks (MOFs) have emerged as great alternatives to traditional nanoporous materials for CO2 separation applications. MOFs are porous materials that are formed by self-assembly of transition metals and organic ligands. The most important advantage of MOFs over well-known porous materials is the possibility to generate multiple materials with varying structural properties and chemical functionalities by changing the combination of metal centers and organic linkers during the synthesis. This leads to a large diversity of materials with various pore sizes and shapes that can be efficiently used for CO2 separations. Since the number of synthesized MOFs has already reached to several thousand, experimental investigation of each MOF at the lab-scale is not practical. High-throughput computational screening of MOFs is a great opportunity to identify the best materials for CO2 separation and to gain molecular-level insights into the structure-performance relationships. This type of knowledge can be used to design new materials with the desired structural features that can lead to extraordinarily high CO2 selectivities. In this mini-review, we focused on developments in high-throughput molecular simulations of MOFs for CO2 separations. After reviewing the current studies on this topic, we discussed the opportunities and challenges in the field and addressed the potential future developments.

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“…Other fillers that were used in the MMMs as fillers are silica, activated carbon, metal nanoparticles, graphene, carbon nanotubes, porous polymers, covalent organic frameworks, etc. [19][20][21][31][32][33][34][35][36][37][38][39] The microporous materials show very high selectivity owing to their molecular sieving capability. Another factor that affects the properties are their surface functionality which improves adsorption of the gases on their surfaces which in turn results in improved molecular diffusion through its pores.…”

Section: Polymer-filler Compatibilitymentioning

confidence: 99%

Mixed Matrix Membranes for Gas Separation Applications

Carreon¹,

Dahe²,

Feng³

et al. 2017

Membranes for Gas Separations

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Mixed matrix membranes (MMMs) have gained lot of interest in the research community over the last few years in order to overcome the performance trade-off shown by the polymeric membranes. An MMM utilizes the benefits of both polymeric and inorganic materials and has the potential to show very high performance without much increase in the cost of fabrication. But the fabrication of an MMM without conceding the mechanical properties is very challenging. In this chapter, the materials selection and fabrication techniques of MMM in both flat sheet and hollow fiber configurations are discussed. Formation of defects at the interface is one of the biggest challenges in fabricating the MMM. Different techniques used in the literature to compatibilize the polymer and particle were summarized. In addition, the recent progress of MMM for gas separation applications and performance prediction models were provided in detail.

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Opportunities and challenges of MOF-based membranes in gas separations

Cited by 261 publications

References 234 publications

The effect of amine substituent chain length on POSS/Polysulfone mixed matrix membrane

The effect of amine substituent chain length on POSS/Polysulfone mixed matrix membrane

High-Throughput Molecular Simulations of Metal Organic Frameworks for CO2 Separation: Opportunities and Challenges

Mixed Matrix Membranes for Gas Separation Applications

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