scholarly journals Impact of Ionic Liquid Structure and Loading on Gas Sorption and Permeation for ZIF-8-Based Composites and Mixed Matrix Membranes

Membranes ◽  
2021 ◽  
Vol 12 (1) ◽  
pp. 13
Author(s):  
Paloma Ortiz-Albo ◽  
Tiago J. Ferreira ◽  
Carla F. Martins ◽  
Vitor Alves ◽  
Isabel A. A. C. Esteves ◽  
...  
Keyword(s):  
Metal Organic Framework ◽  
Strong Dependence ◽  
Liquid Structure ◽  
Mixed Matrix Membranes ◽  
Inorganic Membranes ◽  
Gas Sorption ◽  
Mixed Matrix ◽  
Carbon Dioxide Co2 ◽  
The Impact ◽  
Matrix Membranes

Carbon dioxide (CO2) capture has become of great importance for industrial processes due to the adverse environmental effects of gas emissions. Mixed matrix membranes (MMMs) have been studied as an alternative to traditional technologies, especially due to their potential to overcome the practical limitations of conventional polymeric and inorganic membranes. In this work, the effect of using different ionic liquids (ILs) with the stable metal–organic framework (MOF) ZIF-8 was evaluated. Several IL@ZIF-8 composites and IL@ZIF-8 MMMs were prepared to improve the selective CO2 sorption and permeation over other gases such as methane (CH4) and nitrogen (N2). Different ILs and two distinct loadings were prepared to study not only the effect of IL concentration, but also the impact of the IL structure and affinity towards a specific gas mixture separation. Single gas sorption studies showed an improvement in CO2/CH4 and CO2/N2 selectivities, compared with the ones for the pristine ZIF-8, increasing with IL loading. In addition, the prepared IL@ZIF-8 MMMs showed improved CO2 selective behavior and mechanical strength with respect to ZIF-8 MMMs, with a strong dependence on the intrinsic IL CO2 selectivity. Therefore, the selection of high affinity ILs can lead to the improvement of CO2 selective separation for IL@ZIF-8 MMMs.

scholarly journals A Prospective Concept on the Fabrication of Blend PES/PEG/DMF/NMP Mixed Matrix Membranes with Functionalised Carbon Nanotubes for CO2/N2 Separation

Membranes ◽  
2021 ◽  
Vol 11 (7) ◽  
pp. 519
Author(s):  
Ashvin Viknesh Mahenthiran ◽  
Zeinab Abbas Jawad
Keyword(s):  
Gas Separation ◽  
Fossil Fuels ◽  
Void Formation ◽  
Chemical Properties ◽  
Mixed Matrix Membranes ◽  
Separation Performance ◽  
Mixed Matrix ◽  
Carbon Dioxide Co2 ◽  
The Impact ◽  
Matrix Membranes

With an ever-increasing global population, the combustion of fossil fuels has risen immensely to meet the demand for electricity, resulting in significant increase in carbon dioxide (CO2) emissions. In recent years, CO2 separation technology, such as membrane technology, has become highly desirable. Fabricated mixed matrix membranes (MMMs) have the most desirable gas separation performances, as these membranes have the ability to overcome the trade-off limitations. In this paper, blended MMMs are reviewed along with two polymers, namely polyether sulfone (PES) and polyethylene glycol (PEG). Both polymers can efficiently separate CO2 because of their chemical properties. In addition, blended N-methyl-2-pyrrolidone (NMP) and dimethylformamide (DMF) solvents were also reviewed to understand the impact of blended MMMs’ morphology on separation of CO2. However, the fabricated MMMs had challenges, such as filler agglomeration and void formation. To combat this, functionalised multi-walled carbon nanotube (MWCNTs-F) fillers were utilised to aid gas separation performance and polymer compatibility issues. Additionally, a summary of the different fabrication techniques was identified to further optimise the fabrication methodology. Thus, a blended MMM fabricated using PES, PEG, NMP, DMF and MWCNTs-F is believed to improve CO2/nitrogen separation.

Effect of new metal–organic framework (zeolitic imidazolate framework [ZIF-12]) in mixed matrix membranes on structure, morphology, and gas separation properties

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Mehtap Safak Boroglu ◽  
Ismail Boz ◽  
Busra Kaya
Keyword(s):  
Gas Separation ◽  
Gas Permeability ◽  
Metal Organic Framework ◽  
Thermomechanical Analysis ◽  
Variable Pressure ◽  
Mixed Matrix Membranes ◽  
Mixed Matrix ◽  
Sem Images ◽  
Zeolitic Imidazolate Framework ◽  
Matrix Membranes

Abstract In our study, the synthesis of zeolitic imidazolate framework (ZIF-12) crystals and the preparation of mixed matrix membranes (MMMs) with various ZIF-12 loadings were targeted. The characterization of ZIF-12 and MMMs were carried out by Fourier transform infrared spectroscopy analysis, thermogravimetric analysis, scanning electron microscopy (SEM), and thermomechanical analysis. The performance of MMMs was measured by the ability of binary gas separation. Commercial polyetherimide (PEI-Ultem® 1000) polymer was used as the polymer matrix. The solution casting method was utilized to obtain dense MMMs. In the SEM images of ZIF-12 particles, the particles with a rhombic dodecahedron structure were identified. From SEM images, it was observed that the distribution of ZIF-12 particles in the MMMs was homogeneous and no agglomeration was present. Gas permeability experiments of MMMs were measured for H2, CO2, and CH4 gases at steady state, at 4 bar and 35 °C by constant volume-variable pressure method. PEI/ZIF-12-30 wt% MMM exhibited high permeability and ideal selectivity values for H2/CH4 and CO2/CH4 were P H 2 / CH 4 = 331.41 ${P}_{{\text{H}}_{2}/{\text{CH}}_{4}}=331.41$ and P CO 2 / CH 4 = 53.75 ${P}_{{\text{CO}}_{2}/{\text{CH}}_{4}}=53.75$ gas pair.

scholarly journals CO2 Selective, Zeolitic Imidazolate Framework-7 Based Polymer Composite Mixed-Matrix Membranes

2018 ◽  
Vol 7 (3) ◽  
pp. 1 ◽  
Author(s):  
Tina Chakrabarty ◽  
Pradeep Neelakanda ◽  
Klaus-Viktor Peinemann
Keyword(s):  
Metal Organic Framework ◽  
Time Lag ◽  
Morphological Characterization ◽  
Mixed Matrix Membranes ◽  
Co2 Removal ◽  
Hybrid Membranes ◽  
Mixed Matrix ◽  
Zeolitic Imidazolate Framework ◽  
Custom Made ◽  
Matrix Membranes

CO2 removal is necessary to mitigate the effects of global warming but it is a challenging process to separate CO2 from natural gas, biogas, and other gas streams. Development of hybrid membranes by use of polymers and metal-organic framework (MOF) particles is a viable option to overcome this challenge. A ZIF-7 nano-filler that was synthesized in our lab was embedded into a designed polymer matrix at various loadings and the performance of the mixed matrix membranes was evaluated in terms of gas permeance and selectivity. Hybrid membranes with various loadings (20, 30 and 40 wt%) were developed and tested at room temperature by a custom made time lag equipment and a jump in selectivity was observed when compared with the pristine polymer. A commercially attractive region for the selectivity CO2 over CH4 was achieved with a selectivity of 39 for 40 wt% particle loading. An increase in selectivity was observed with the increase of ZIF-7 loadings. Best performance was seen at 40% ZIF-7 loaded membrane with an ideal selectivity of 39 for CO2 over CH4. The obtained selectivity was 105% higher for CO2 over CH4 than the selectivity of the pristine polymer with a slight decrease in permeance. Morphological characterization of such developed membranes showed an excellent compatibility between the polymer and particle adhesion.

Flexible Metal-Organic Framework-Based Mixed-Matrix Membranes: A New Platform for H2 S Sensors

Small ◽  
2018 ◽  
Vol 14 (37) ◽  
pp. 1801563 ◽  
Author(s):  
Xin Zhang ◽  
Qi Zhang ◽  
Dan Yue ◽  
Jun Zhang ◽  
Jintong Wang ◽  
...  
Keyword(s):  
Metal Organic Framework ◽  
Mixed Matrix Membranes ◽  
Mixed Matrix ◽  
Metal Organic ◽  
Flexible Metal ◽  
Organic Framework ◽  
Matrix Membranes

scholarly journals Towards High Performance Metal-Organic Framework-Microporous Polymer Mixed Matrix Membranes: Addressing Compatibility and Limiting Aging by Polymer Doping

2018 ◽  
Vol 24 (49) ◽  
pp. 12796-12800 ◽  
Author(s):  
Anahid Sabetghadam ◽  
Xinlei Liu ◽  
Angelica F. Orsi ◽  
Magdalena M. Lozinska ◽  
Timothy Johnson ◽  
...  
Keyword(s):  
High Performance ◽  
Metal Organic Framework ◽  
Mixed Matrix Membranes ◽  
Mixed Matrix ◽  
Microporous Polymer ◽  
Metal Organic ◽  
Organic Framework ◽  
Matrix Membranes

scholarly journals Dimensional Nanofillers in Mixed Matrix Membranes for Pervaporation Separations: A Review

Membranes ◽  
2020 ◽  
Vol 10 (9) ◽  
pp. 193
Author(s):  
Guang Yang ◽  
Zongli Xie ◽  
Marlene Cran ◽  
Chunrui Wu ◽  
Stephen Gray
Keyword(s):  
Polymer Matrix ◽  
High Performance ◽  
Three Dimensional ◽  
Liquid Mixtures ◽  
Mixed Matrix Membranes ◽  
Mixed Matrix ◽  
Inorganic Fillers ◽  
High Flexibility ◽  
The Impact ◽  
Matrix Membranes

Pervaporation (PV) has been an intriguing membrane technology for separating liquid mixtures since its commercialization in the 1980s. The design of highly permselective materials used in this respect has made significant improvements in separation properties, such as selectivity, permeability, and long-term stability. Mixed-matrix membranes (MMMs), featuring inorganic fillers dispersed in a polymer matrix to form an organic–inorganic hybrid, have opened up a new avenue to facilely obtain high-performance PV membranes. The combination of inorganic fillers in a polymer matrix endows high flexibility in designing the required separation properties of the membranes, in which various fillers provide specific functions correlated to the separation process. This review discusses recent advances in the use of nanofillers in PV MMMs categorized by dimensions including zero-, one-, two- and three-dimensional nanomaterials. Furthermore, the impact of the nanofillers on the polymer matrix is described to provide in-depth understanding of the structure–performance relationship. Finally, the applications of nanofillers in MMMs for PV separation are summarized.

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