Transport mechanism of water molecules passing through polyamide/COF mixed matrix membranes

2019 ◽  
Vol 21 (48) ◽  
pp. 26591-26597 ◽  
Author(s):  
Yang Song ◽  
Mingjie Wei ◽  
Fang Xu ◽  
Yong Wang
Keyword(s):  
Water Permeability ◽  
Transport Mechanism ◽  
High Water ◽  
Mixed Matrix Membranes ◽  
Water Molecules ◽  
Mixed Matrix ◽  
Salt Rejection ◽  
The Cost ◽  
Significant Attention ◽  
Matrix Membranes

Mixed matrix membranes (MMMs) have gained significant attention due to their high water permeability without the cost of salt rejection. The mechanism of permeability promotion for PA/COFs MMMs is investigated in this work from molecular insights.

scholarly journals Synthesis of graphene oxide/polyimide mixed matrix membranes for desalination

RSC Advances ◽  
2017 ◽  
Vol 7 (4) ◽  
pp. 2211-2217 ◽  
Author(s):  
Bo Feng ◽  
Kai Xu ◽  
Aisheng Huang
Keyword(s):  
Graphene Oxide ◽  
Water Flux ◽  
High Water ◽  
High Salt ◽  
Mixed Matrix Membranes ◽  
Mixed Matrix ◽  
Salt Rejection ◽  
Matrix Membranes

Graphene oxide (GO) was incorporated into polyimide (PI) to fabricate GO/PI mixed matrix membranes (MMMs), which show a high water flux (36.1 kg m−2 h−1) and a high salt rejection (99.9%) for desalination of 3.5 wt% seawater at 90 °C.

scholarly journals Understanding the morphology of MWCNT/PES mixed-matrix membranes using SANS: interpretation and rejection performance

2019 ◽  
Vol 9 (7) ◽  
Author(s):  
Km Nikita ◽  
P. Karkare ◽  
D. Ray ◽  
V. K. Aswal ◽  
Puyam S. Singh ◽  
...  
Keyword(s):  
Water Flux ◽  
High Water ◽  
Mixed Matrix Membranes ◽  
High Porosity ◽  
Mixed Matrix ◽  
Multiwalled Carbon ◽  
Working Pressure ◽  
Water Transportation ◽  
Phase Inversion Technique ◽  
Matrix Membranes

Abstract We describe the relationship between the morphology and rejection performance by the mixed-matrix membranes as a unique class of high water flux nanofiltration membranes comprising polyethersulfone/functionalized multiwalled carbon nanotubes (PES/f-MWCNTs). These membranes contain aligned MWCNTs uniformly distributed inside a PES matrix prepared using conventional phase-inversion technique. The small-angle neutron scattering analysis confirmed the high porosity and uniformity among of the pores of CNTs in the membranes. The frictionless water transport from vertically oriented f-MWCNTs were verified to facilitate remarkable enhancement in the water flux through the membranes. The water transportation speed, as well as rejection, of selected heavy metals increases nearly about 3 times and 2–3.5 times, respectively, than the pristine PES membrane, depending upon CNTs loading. Low working pressure and good retention properties make these membranes to be an ideal for the application of highly efficient filtration units.

scholarly journals Polybenzimidazole-based mixed membranes with exceptionally high water vapor permeability and selectivity

2017 ◽  
Vol 5 (41) ◽  
pp. 21807-21819 ◽  
Author(s):  
F. H. Akhtar ◽  
M. Kumar ◽  
L. F. Villalobos ◽  
H. Vovusha ◽  
R. Shevate ◽  
...  
Keyword(s):  
Water Vapor ◽  
Gas Separation ◽  
Water Vapor Permeability ◽  
High Water ◽  
Mixed Matrix Membranes ◽  
Vapor Permeability ◽  
Mixed Matrix ◽  
Matrix Membranes

Mixed matrix membranes containing polybenzimidazole and titania-based fillers with different morphologies are fabricated and tested for efficient water vapor/gas separation applications.

scholarly journals CO2/CH4 and He/N2 Separation Properties and Water Permeability Valuation of Mixed Matrix MWCNTs-Based Cellulose Acetate Flat Sheet Membranes: A Study of the Optimization of the Filler Material Dispersion Method

Nanomaterials ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 280
Author(s):  
Tobias Esser ◽  
Tobias Wolf ◽  
Tim Schubert ◽  
Jan Benra ◽  
Stefan Forero ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Cellulose Acetate ◽  
Water Permeability ◽  
Filler Material ◽  
Mixed Matrix Membranes ◽  
Mixed Matrix ◽  
Feed Concentration ◽  
Water Permeation ◽  
Cellulose Acetate Membranes ◽  
Matrix Membranes

The main scope of this work is to develop nano-carbon-based mixed matrix cellulose acetate membranes (MMMs) for the potential use in both gas and liquid separation processes. For this purpose, a variety of mixed matrix membranes, consisting of cellulose acetate (CA) polymer and carbon nanotubes as additive material were prepared, characterized, and tested. Multi-walled carbon nanotubes (MWCNTs) were used as filler material and diacetone alcohol (DAA) as solvent. The first main objective towards highly efficient composite membranes was the proper preparation of agglomerate-free MWCNTs dispersions. Rotor-stator system (RS) and ultrasonic sonotrode (USS) were used to achieve the nanofillers’ dispersion. In addition, the first results of the application of the three-roll mill (TRM) technology in the filler dispersion achieved were promising. The filler material, MWCNTs, was characterized by scanning electron microscopy (SEM) and liquid nitrogen (LN2) adsorption-desorption isotherms at 77 K. The derivatives CA-based mixed matrix membranes were characterized by tensile strength and water contact angle measurements, impedance spectroscopy, gas permeability/selectivity measurements, and water permeability tests. The studied membranes provide remarkable water permeation properties, 12–109 L/m2/h/bar, and also good separation factors of carbon dioxide and helium separations. Specifically, a separation factor of 87 for 10% He/N2 feed concentration and a selectivity value of 55.4 for 10% CO2/CH4 feed concentration were achieved.

scholarly journals High-throughput computational prediction of the cost of carbon capture using mixed matrix membranes

2019 ◽  
Vol 12 (4) ◽  
pp. 1255-1264 ◽  
Author(s):  
Samir Budhathoki ◽  
Olukayode Ajayi ◽  
Janice A. Steckel ◽  
Christopher E. Wilmer
Keyword(s):  
High Throughput ◽  
Carbon Capture ◽  
Computational Prediction ◽  
Mixed Matrix Membranes ◽  
Mixed Matrix ◽  
The Cost ◽  
Potential Use ◽  
Matrix Membranes

Mixed matrix membranes are being studied for their potential use in post-combustion carbon capture on the premise that they could dramatically lower costs relative to mature technologies available today.

Long-Term Stable Metal Organic Framework (MOF) Based Mixed Matrix Membranes for Ultrafiltration

2020 ◽  
Author(s):  
Muayad Al-shaeli ◽  
Stefan J. D. Smith ◽  
Shanxue Jiang ◽  
Huanting Wang ◽  
Kaisong Zhang ◽  
...  
Keyword(s):  
Contact Angle ◽  
Water Contact Angle ◽  
Mixed Matrix Membranes ◽  
Recovery Ratio ◽  
Mixed Matrix ◽  
Water Contact ◽  
Membrane Performance ◽  
Metal Organic ◽  
Matrix Membranes

<p>In this study, novel <a>mixed matrix polyethersulfone (PES) membranes</a> were synthesized by using two different kinds of metal organic frameworks (MOFs), namely UiO-66 and UiO-66-NH<sub>2</sub>. The composite membranes were characterised by SEM, EDX, FTIR, PXRD, water contact angle, porosity, pore size, etc. Membrane performance was investigated by water permeation flux, flux recovery ratio, fouling resistance and anti-fouling performance. The stability test was also conducted for the prepared mixed matrix membranes. A higher reduction in the water contact angle was observed after adding both MOFs to the PES and sulfonated PES membranes compared to pristine PES membranes. An enhancement in membrane performance was observed by embedding the MOF into PES membrane matrix, which may be attributed to the super-hydrophilic porous structure of UiO-66-NH<sub>2</sub> nanoparticles and hydrophilic structure of UiO-66 nanoparticles that could accelerate the exchange rate between solvent and non-solvent during the phase inversion process. By adding the MOFs into PES matrix, the flux recovery ratio was increased greatly (more than 99% for most mixed matrix membranes). The mixed matrix membranes showed higher resistance to protein adsorption compared to pristine PES membranes. After immersing the membranes in water for 3 months, 6 months and 12 months, both MOFs were stable and retained their structure. This study indicates that UiO-66 and UiO-66-NH<sub>2</sub> are great candidates for designing long-term stable mixed matrix membranes with higher anti-fouling performance.</p>

Porous covalent triazine piperazine polymer (CTPP)/PEBAX mixed matrix membranes for CO2/N2 and CO2/CH4 separations

2019 ◽  
Vol 591 ◽  
pp. 117348 ◽  
Author(s):  
Roshni L. Thankamony ◽  
Xiang Li ◽  
Swapan K. Das ◽  
Mayur M. Ostwal ◽  
Zhiping Lai
Keyword(s):  
Mixed Matrix Membranes ◽  
Mixed Matrix ◽  
Matrix Membranes

Mixed matrix membranes with molecular-interaction-driven tunable free volumes for efficient bio-fuel recovery

2015 ◽  
Vol 3 (8) ◽  
pp. 4510-4521 ◽  
Author(s):  
Gongping Liu ◽  
Wei-Song Hung ◽  
Jie Shen ◽  
Qianqian Li ◽  
Yun-Hsuan Huang ◽  
...  
Keyword(s):  
Polymer Chain ◽  
Molecular Interactions ◽  
Molecular Interaction ◽  
Chain Conformation ◽  
Mixed Matrix Membranes ◽  
Mixed Matrix ◽  
Polymer Chain Conformation ◽  
Matrix Membranes

Molecular interactions were constructed to control polymer chain conformation to fabricate mixed matrix membranes with tunable free volumes, exhibiting simultaneously improved butanol permeability and selectivity.

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