scholarly journals CARBON DIOXIDE/METHANE SEPARATION PERFORMANCE BY MIXED MATRIX MEMBRANE FROM POLYSULFONE/ HALLOYSITE NANOTUBES

2020 ◽  
Vol 82 (3) ◽  
Author(s):  
Noor Maizura Ismail ◽  
Nur Afaliza Yusaini ◽  
Jannah Jafa ◽  
S. M. Anisuzzaman ◽  
Chiam Chel Ken ◽  
...  
Keyword(s):  
Gas Separation ◽  
Halloysite Nanotubes ◽  
Skin Layer ◽  
Gas Permeation ◽  
Mixed Matrix Membranes ◽  
Inorganic Filler ◽  
Mixed Matrix Membrane ◽  
Separation Performance ◽  
Mixed Matrix ◽  
Morphological Differences

Gas separation by using membrane-based technology is one of the rising technologies used in the industry. It has many advantages such as low in cost and energy consumption. However, this technology is limited because of the "trade-off" exists between permeability and selectivity of the membrane. Thus, in this study, an inorganic filler, halloysite nanotube is modified with 3-aminopropyl(triethoxysilane) and then incorporated into the polysulfone polymer and the performance of the mixed matrix membranes (MMMs) is investigated. MMMs were analyzed by using SEM, FTIR, tensile and gas permeation tests which studied the morphological differences, mechanical strength, and membrane permeability and selectivity towards CO2 and CH4 respectively. The performance of the MMMs was compared with neat membrane and MMMs with unmodified HNTs. SEM results show an increase of 111% on the thickness of the dense skin layer of MMMs with APTES-modified HNTs compared to the neat membrane and the MMMs with unmodified HNTs. Elongation at break for MMMs with 3-APTES-modified HNTs also increased to 24.22%. The gas separation performance of the MMMs with 3-APTES modified HNTs shows an overall increase of 25.37% in the membrane selectivity compared to MMMs with unmodified HNTs while when coating is done, the selectivity of the MMMs with 3-APTES modified HNTs shows an increase from 0.845 to 10.158 for a pressure of 2 bar showing that coating helps in increasing the selectivity of the membrane.

scholarly journals A Novel Composite Material UiO-66@HNT/Pebax Mixed Matrix Membranes for Enhanced CO2/N2 Separation

Membranes ◽  
2021 ◽  
Vol 11 (9) ◽  
pp. 693
Author(s):  
Fei Guo ◽  
Bingzhang Li ◽  
Rui Ding ◽  
Dongsheng Li ◽  
Xiaobin Jiang ◽  
...  
Keyword(s):  
Composite Material ◽  
Gas Separation ◽  
Halloysite Nanotubes ◽  
Gas Permeation ◽  
Mixed Matrix Membranes ◽  
Mixed Matrix Membrane ◽  
Separation Performance ◽  
Mixed Matrix ◽  
Transport Pathways ◽  
Gas Separation Performance

Mixing a polymer matrix and nanofiller to prepare a mixed matrix membrane (MMM) is an effective method for enhancing gas separation performance. In this work, a unique UiO-66-decorated halloysite nanotubes composite material (UiO-66@HNT) was successfully synthesized via a solvothermal method and dispersed into the Pebax-1657 matrix to prepare MMMs for CO2/N2 separation. A remarkable characteristic of this MMM was that the HNT lumen provided the highway for CO2 diffusion due to the unique affinity of UiO-66 for CO2. Simultaneously, the close connection of the UiO-66 layer on the external surface of HNTs created relatively continuous pathways for gas permeation. A suite of microscopy, diffraction, and thermal techniques was used to characterize the morphology and structure of UiO-66@HNT and the membranes. As expected, the embedding UiO-66@HNT composite materials significantly improved the separation performances of the membranes. Impressively, the as-obtained membrane acquired a high CO2 permeability of 119.08 Barrer and CO2/N2 selectivity of 76.26. Additionally, the presence of UiO-66@HNT conferred good long-term stability and excellent interfacial compatibility on the MMMs. The results demonstrated that the composite filler with fast transport pathways designed in this study was an effective strategy to enhance gas separation performance of MMMs, verifying its application potential in the gas purification industry.

scholarly journals Improved CO2/CH4 Separation Properties of Cellulose Triacetate Mixed–Matrix Membranes with CeO2@GO Hybrid Fillers

Membranes ◽  
2021 ◽  
Vol 11 (10) ◽  
pp. 777
Author(s):  
Chhabilal Regmi ◽  
Saeed Ashtiani ◽  
Zdeněk Sofer ◽  
Karel Friess
Keyword(s):  
Gas Separation ◽  
Chemical Properties ◽  
Gas Permeation ◽  
Mixed Matrix Membranes ◽  
Inorganic Filler ◽  
Separation Performance ◽  
Mixed Matrix ◽  
Hybrid Filler ◽  
Hybrid Fillers ◽  
Matrix Membranes

The study of the effects associated with the compatibility of the components of the hybrid filler with polymer matrix, which ultimately decide on achieving mixed matrix membranes (MMMs) with better gas separation properties, is essential. Herein, a facile solution casting process of simple incorporating CeO2@GO hybrid inorganic filler material is implemented. Significant improvements in material and physico-chemical properties of the synthesized membranes were observed by SEM, XRD, TGA, and stress-strain measurements. Usage of graphene oxide (GO) with polar groups on the surface enabled forming bonds with ceria (CeO2) nanoparticles and CTA polymer and provided the homogeneous dispersion of the nanofillers in the hybrid MMMs. Moreover, increasing GO loading concentration enhanced both gas permeation in MMMs and CO2 gas uptakes. The best performance was achieved by the membrane containing 7 wt.% of GO with CO2 permeability of 10.14 Barrer and CO2/CH4 selectivity 50.7. This increase in selectivity is almost fifteen folds higher than the CTA-CeO2 membrane sample, suggesting the detrimental effect of GO for enhancing the selectivity property of the MMMs. Hence, a favorable synergistic effect of CeO2@GO hybrid fillers on gas separation performance is observed, propounding the efficient and feasible strategy of using hybrid fillers in the membrane for the potential biogas upgrading process.

scholarly journals Multiple Amine-Contained POSS-Functionalized Organosilica Membranes for Gas Separation

Membranes ◽  
2021 ◽  
Vol 11 (3) ◽  
pp. 194
Author(s):  
Xiuxiu Ren ◽  
Masakoto Kanezashi ◽  
Meng Guo ◽  
Rong Xu ◽  
Jing Zhong ◽  
...  
Keyword(s):  
Gas Separation ◽  
Mixed Matrix Membranes ◽  
Mixed Matrix Membrane ◽  
Separation Performance ◽  
Hybrid Membranes ◽  
Mixed Matrix ◽  
Translation Model ◽  
Good Thermal Stability ◽  
Oligomeric Silsesquioxane

A new polyhedral oligomeric silsesquioxane (POSS) designed with eight –(CH2)3–NH–(CH2)2–NH2 groups (PNEN) at its apexes was used as nanocomposite uploading into 1,2-bis(triethoxysilyl)ethane (BTESE)-derived organosilica to prepare mixed matrix membranes (MMMs) for gas separation. The mixtures of BTESE-PNEN were uniform with particle size of around 31 nm, which is larger than that of pure BTESE sols. The characterization of thermogravimetric (TG) and gas permeance indicates good thermal stability. A similar amine-contained material of 3-aminopropyltriethoxysilane (APTES) was doped into BTESE to prepare hybrid membranes through a copolymerized strategy as comparison. The pore size of the BTESE-PNEN membrane evaluated through a modified gas-translation model was larger than that of the BTESE-APTES hybrid membrane at the same concentration of additions, which resulted in different separation performance. The low values of Ep(CO2)-Ep(N2) and Ep(N2) for the BTESE-PNEN membrane at a low concentration of PNEN were close to those of copolymerized BTESE-APTES-related hybrid membranes, which illustrates a potential CO2 separation performance by using a mixed matrix membrane strategy with multiple amine POSS as particles.

Carbon Nanotubes Based Mixed Matrix Membrane for Gas Separation

2011 ◽  
Vol 364 ◽  
pp. 272-277 ◽  
Author(s):  
S.M. Sanip ◽  
A.F. Ismail ◽  
P.S. Goh ◽  
M.N.A. Norrdin ◽  
T. Soga ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Carbon Nanotubes ◽  
Gas Separation ◽  
Polymer Matrix ◽  
Current Trend ◽  
Mixed Matrix Membranes ◽  
Mixed Matrix Membrane ◽  
Separation Performance ◽  
Mixed Matrix ◽  
Polyimide Membrane

Mixed matrix membranes (MMM) combine useful molecular sieving properties of inorganic fillers with the desirable mechanical and processing properties of polymers. The current trend in polymeric membranes is the incorporation of filler-like nanoparticles to improve the separation performance. Most MMM have shown higher gas permeabilities and improved gas selectivities compared to the corresponding pure polymer membranes. Carbon nanotubes based mixed matrix membrane was prepared by the solution casting method in which the functionalized multiwalled carbon nanotubes (f-MWNTs) were embedded into the polyimide membrane and the resulting membranes were characterized. The effect of nominal MWNTs content between 0.5 and 1.0 wt% on the gas separation properties were looked into. The as-prepared membranes were characterized for their morphology using field emission scanning electron microscopy (FESEM) and Transmission Electron Microscopy (TEM). The morphologies of the MMM also indicated that at 0.7 % loading of f-MWNTs, the structures of the MMM showed uniform finger-like structures which have facilitated the fast gas transport through the polymer matrix. It may also be concluded that addition of open ended and shortened MWNTs to the polymer matrix can improve its permeability by increasing diffusivity through the MWNTs smooth cavity.

Investigation of the silica pore size effect on the performance of polysulfone (PSf) mixed matrix membranes (MMMs) for gas separation

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Gholamhossein Vatankhah ◽  
Babak Aminshahidy
Keyword(s):  
Mesoporous Silica ◽  
Pore Size ◽  
Gas Separation ◽  
Gas Permeation ◽  
Mixed Matrix Membranes ◽  
Separation Performance ◽  
Mixed Matrix ◽  
Small Pore ◽  
Mcm 41 ◽  
Matrix Membranes

Abstract MCM-41 and SBA-15 mesoporous silica materials with different pore sizes (3.08 nm for small pore size MCM-41 (P 1), 5.89 nm for medium pore size SBA-15 (P 2), and 7.81 nm for large pore size SBA-15 (P 3)) were synthesized by the hydrothermal method and then functionalized with 3-aminopropyltrietoxysilane by postsynthesis treatments. Next, polysulfone-mesoporous silica mixed matrix membranes (MMMs) were prepared by the solution casting method. The obtained materials and MMMs were characterized by various techniques including X-ray diffraction, scanning electron microscopy, and N2 adsorption-desorption, and Brunauer-Emmett-Teller method to examine the crystallinity, morphology, and particle size, pore volume, specific surface area, and pore size distribution, respectively. Finally, the gas permeation rates of prepared MMMs were measured in 8 bar and 25 °C and the effect of pore size of modified and unmodified mesoporous silica on the gas separation performance of these MMMs were investigated. The experimental results indicate that the carbon dioxide (CO2) and methane (CH4) permeability and CO2/CH4 selectivity were increased with an enhancement in the particle pore size.

scholarly journals Preparation of Mixed Matrix Membranes Containing ZIF-8 and UiO-66 for Multicomponent Light Gas Separation

Crystals ◽  
2018 ◽  
Vol 9 (1) ◽  
pp. 15 ◽  
Author(s):  
Eun Kim ◽  
Hyun Kim ◽  
Donghwi Kim ◽  
Jinsoo Kim ◽  
Pyung Lee
Keyword(s):  
Gas Separation ◽  
Gas Permeation ◽  
Polymer Membrane ◽  
Mixed Matrix Membranes ◽  
Gas Mixture ◽  
Separation Performance ◽  
Mixed Matrix ◽  
Neat Polymer ◽  
H2 Permeability ◽  
Matrix Membranes

Mixed matrix membranes (MMMs) containing zeolitic imidazolite framework-8 (ZIF-8) and UiO-66 as microporous fillers were prepared and evaluated their potential for the separation of a gas mixture produced by a methane reforming process. Hydrothermal synthesis was performed to prepare both the ZIF-8 and UiO-66 crystals, with crystal sizes ranging from 50 to 70 nm for ZIF-8 and from 200 to 300 nm for UiO-66. MMMs were prepared with 15% filler loading for both MMM (ZIF-8) and MMM (UiO-66). MMM (UiO-66) exhibited H2 permeability of 64.4 barrer and H2/CH4 selectivity of 153.3 for single gas permeation, which are more than twice the values that were exhibited by a neat polymer membrane. MMM (ZIF-8) also showed better separation properties than that of a neat polymer membrane with H2 permeability of 27.1 barrer and H2/CH4 selectivity of 123.2. When a gas mixture consisting of 78% Ar/18% H2/4% CH4 flowed into the membranes at 5 bar, the H2 purity increased to as high as 93%. However, no improvement in the mixture gas separation performance was achieved by the MMMs as compared to that of a neat polymer membrane.

scholarly journals Membranes for Gas Separation Current Development and Challenges

2015 ◽  
Vol 773-774 ◽  
pp. 1085-1090 ◽  
Author(s):  
Norwahyu Jusoh ◽  
Yin Fong Yeong ◽  
Kok Keong Lau ◽  
Mohd Shariff Azmi
Keyword(s):  
Gas Separation ◽  
Polymeric Materials ◽  
Membrane Technology ◽  
Polymeric Membrane ◽  
Inorganic Membrane ◽  
Mixed Matrix Membranes ◽  
Mixed Matrix Membrane ◽  
Separation Performance ◽  
Inorganic Membranes ◽  
Mixed Matrix

—A new bang of natural gas demand has opened up the opportunities towards the utilization of membrane technology for the purification process.The advantages in terms of smaller footprint, lower weight, minimum utility requirement and low labor intensity make them appropriate for wide scale applications. Polymeric membrane is one of the greatest emerging fields in membrane material development. Nevertheless, the separation performance of the existing polymeric materials were reached a limit in the trade-off between permeability and selectivity. The development of inorganic material gives a significance improvement in membrane performance but it outrageously expensive for many applications and having complicated procedure during fabrication process have limit the application of inorganic membrane in gas separation. Thus, a rapid demand in membrane technology for gas separation and the effort toward seeking the membranes with higher permeability and selectivity has motivated the development of mixed matrix membrane. Mixed matrix membrane (MMM) which incorporating inorganic fillers in a polymer matrix is expected to overcome the limitations of the polymeric and inorganic membranes. Apart from an overview of the different membrane materials for gas separation, this paper also highlights the development of mixed matrix membrane and challenges in fabrication of mixed matrix membranes.

scholarly journals Interfacial Design of Mixed Matrix Membranes via Grafting PVA on UiO-66-NH2 to Enhance the Gas Separation Performance

Membranes ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 419
Author(s):  
Saeed Ashtiani ◽  
Mehdi Khoshnamvand ◽  
Chhabilal Regmi ◽  
Karel Friess
Keyword(s):  
Gas Separation ◽  
Reversible Reaction ◽  
Mixed Matrix Membranes ◽  
Mixed Matrix Membrane ◽  
Poly Vinyl Alcohol ◽  
Separation Performance ◽  
Strong Impact ◽  
Mixed Matrix ◽  
Cross Sectional ◽  
Covalent Interaction

In this study, defect-free facilitated transport mixed matrix membrane (MMM) with high loading amount of UiO-66-NH2 nanoparticles as metal–organic frameworks (MOFs) was fabricated. The MOFs were covalently bonded with poly (vinyl alcohol) (PVA) to incorporate into a poly (vinyl amine) (PVAm) matrix solution. A uniform UiO-66-NH2 dispersion up to 55 wt.% was observed without precipitation and agglomeration after one month. This can be attributed to the high covalent interaction at interfaces of UiO-66-NH2 and PVAm, which was provided by PVA as a functionalized organic linker. The CO2 permeability and CO2/N2 and selectivity were significantly enhanced for the fabricated MMM by using optimal fabrication parameters. This improvement in gas performance is due to the strong impact of solubility and decreasing diffusion in obtained dense membrane to promote CO2 transport with a bicarbonate reversible reaction. Therefore, the highest amount of amine functional groups of PVAm among all polymers, plus the abundant amount of amines from UiO-66-NH2, facilitated the preferential CO2 permeation through the bicarbonate reversible reaction between CO2 and –NH2 in humidified conditions. XRD and FTIR were employed to study the MMM chemical structure and polymers–MOF particle interactions. Cross-sectional and surface morphology of the MMM was observed by SEM-EDX and 3D optical profilometer to detect the dispersion of MOFs into the polymer matrix and explore their interfacial morphology. This approach can be extended for a variety of polymer–filler interfacial designs for gas separation applications.

scholarly journals Modified Zeolite/Polysulfone Mixed Matrix Membrane for Enhanced CO2/CH4 Separation

Membranes ◽  
2021 ◽  
Vol 11 (8) ◽  
pp. 630
Author(s):  
Lanisha Devi Anbealagan ◽  
Tiffany Yit Siew Ng ◽  
Thiam Leng Chew ◽  
Yin Fong Yeong ◽  
Siew Chun Low ◽  
...  
Keyword(s):  
Xrd Analysis ◽  
Gas Permeation ◽  
Attenuated Total Reflection ◽  
Significant Enhancement ◽  
Mixed Matrix Membranes ◽  
Mixed Matrix Membrane ◽  
Separation Performance ◽  
Mixed Matrix ◽  
Modified Zeolite ◽  
Zeolite Rho

In recent years, mixed matrix membranes (MMMs) have received worldwide attention for their potential to offer superior gas permeation and separation performance involving CO2 and CH4. However, fabricating defect-free MMMs still remains as a challenge where the incorporation of fillers into MMMs has usually led to some issues including formation of undesirable interfacial voids, which may jeopardize the gas separation performance of the MMMs. This current work investigated the incorporation of zeolite RHO and silane-modified zeolite RHO (NH2–RHO) into polysulfone (PSf) based MMMs with the primary aim of enhancing the membrane’s gas permeation and separation performance. The synthesized zeolite RHO, NH2–RHO, and fabricated membranes were characterized by X-ray diffraction (XRD) analysis, Fourier transform infrared-attenuated total reflection (FTIR-ATR), thermogravimetric analysis (TGA) and field emission scanning election microscopy (FESEM). The effects of zeolite loading in the MMMs on the CO2/CH4 separation performance were investigated. By incorporating 1 wt% of zeolite RHO into the MMMs, the CO2 permeability and ideal CO2/CH4 selectivity slightly increased by 4.2% and 2.7%, respectively, compared to that of a pristine PSf membrane. On the other hand, a significant enhancement of 45% in ideal CO2/CH4 selectivity was attained by MMMs incorporated with 2 wt% of zeolite NH2-RHO compared to a pristine PSf membrane. Besides, all MMMs incorporated with zeolite NH2-RHO displayed higher ideal CO2/CH4 selectivity than that of the MMMs incorporated with zeolite RHO. By incorporating 1–3 wt% zeolite NH2-RHO into PSf matrix, MMMs without interfacial voids were successfully fabricated. Consequently, significant enhancement in ideal CO2/CH4 selectivity was enabled by the incorporation of zeolite NH2–RHO into MMMs.

scholarly journals Fabrication and characterization of polyimide/ polyethersulfone-fumed silica mixed matrix membrane for gas separation

REAKTOR ◽  
2017 ◽  
Vol 11 (1) ◽  
pp. 30 ◽  
Author(s):  
A. F. Ismail ◽  
T. D. Kusworo
Keyword(s):  
Gas Separation ◽  
Fumed Silica ◽  
Inorganic Filler ◽  
Mixed Matrix Membrane ◽  
Separation Performance ◽  
Mixed Matrix ◽  
Separation Membrane ◽  
Pes Membrane ◽  
Gas Separation Performance

This study is performed primarily to investigate the feasibility of fumed silica as inorganic material towards gas separation performance of mixed matrix membrane. In this study, polyimide/ polyethersulfone (PES)-fumed silica mixed matrix membrane were casted using dry/wet technique. The result from the FESEM, DSC and FTIR analysis confirmed that the structure and physical properties of membrane is influenced by inorganic filler. FESEM`s cross-section view indicated good compatibility  between polymer and fumed silica for all of range fumed silica used in this study. The gas separation performance of the mixed matrix membrane with fumed silica were relatively higher compared to that of the neat PI/PES membrane. PI/PES-fumed silica 5 wt% yielded significant selectivity enhancement of 7.21 and 40.47 for O2/N2, and CO2/CH4, respectively.Keywords:  gas separation membrane, mixed matrix membrane, silica

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