Interfacial Design of Mixed Matrix Membranes via Grafting PVA on UiO-66-NH<sub>2</sub> to Enhance the Gas Separation Performance
In this study, defect-free facilitated transport mixed matrix membrane (MMM) with high loading amount of UiO-66-NH<sub>2</sub> nanoparticles as metal–organic frameworks (MOFs) was fabricated. The MOFs were covalently bonded with poly (vinyl alcohol) (PVA) to incorporate into a poly (viny...
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doaj-f35048b0a5c44b8cb53331703021c5ef2021-06-01T01:46:28ZengMDPI AGMembranes2077-03752021-05-011141941910.3390/membranes11060419Interfacial Design of Mixed Matrix Membranes via Grafting PVA on UiO-66-NH<sub>2</sub> to Enhance the Gas Separation PerformanceSaeed Ashtiani0Mehdi Khoshnamvand1Chhabilal Regmi2Karel Friess3Department of Physical Chemistry, University of Chemistry and Technology, Prague, Technická 5, 16628 Prague 6, Czech RepublicState Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, ChinaDepartment of Physical Chemistry, University of Chemistry and Technology, Prague, Technická 5, 16628 Prague 6, Czech RepublicDepartment of Physical Chemistry, University of Chemistry and Technology, Prague, Technická 5, 16628 Prague 6, Czech RepublicIn this study, defect-free facilitated transport mixed matrix membrane (MMM) with high loading amount of UiO-66-NH<sub>2</sub> 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-NH<sub>2</sub> 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-NH<sub>2</sub> and PVAm, which was provided by PVA as a functionalized organic linker. The CO<sub>2</sub> permeability and CO<sub>2</sub>/N<sub>2</sub> 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 CO<sub>2</sub> 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-NH<sub>2</sub>, facilitated the preferential CO<sub>2</sub> permeation through the bicarbonate reversible reaction between CO<sub>2</sub> and –NH<sub>2</sub> 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.https://www.mdpi.com/2077-0375/11/6/419metal–organic frameworkmixed-matrix membraneinterface engineeringUiO-66-NH<sub>2</sub> |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Saeed Ashtiani Mehdi Khoshnamvand Chhabilal Regmi Karel Friess |
spellingShingle |
Saeed Ashtiani Mehdi Khoshnamvand Chhabilal Regmi Karel Friess Interfacial Design of Mixed Matrix Membranes via Grafting PVA on UiO-66-NH<sub>2</sub> to Enhance the Gas Separation Performance Membranes metal–organic framework mixed-matrix membrane interface engineering UiO-66-NH<sub>2</sub> |
author_facet |
Saeed Ashtiani Mehdi Khoshnamvand Chhabilal Regmi Karel Friess |
author_sort |
Saeed Ashtiani |
title |
Interfacial Design of Mixed Matrix Membranes via Grafting PVA on UiO-66-NH<sub>2</sub> to Enhance the Gas Separation Performance |
title_short |
Interfacial Design of Mixed Matrix Membranes via Grafting PVA on UiO-66-NH<sub>2</sub> to Enhance the Gas Separation Performance |
title_full |
Interfacial Design of Mixed Matrix Membranes via Grafting PVA on UiO-66-NH<sub>2</sub> to Enhance the Gas Separation Performance |
title_fullStr |
Interfacial Design of Mixed Matrix Membranes via Grafting PVA on UiO-66-NH<sub>2</sub> to Enhance the Gas Separation Performance |
title_full_unstemmed |
Interfacial Design of Mixed Matrix Membranes via Grafting PVA on UiO-66-NH<sub>2</sub> to Enhance the Gas Separation Performance |
title_sort |
interfacial design of mixed matrix membranes via grafting pva on uio-66-nh<sub>2</sub> to enhance the gas separation performance |
publisher |
MDPI AG |
series |
Membranes |
issn |
2077-0375 |
publishDate |
2021-05-01 |
description |
In this study, defect-free facilitated transport mixed matrix membrane (MMM) with high loading amount of UiO-66-NH<sub>2</sub> 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-NH<sub>2</sub> 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-NH<sub>2</sub> and PVAm, which was provided by PVA as a functionalized organic linker. The CO<sub>2</sub> permeability and CO<sub>2</sub>/N<sub>2</sub> 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 CO<sub>2</sub> 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-NH<sub>2</sub>, facilitated the preferential CO<sub>2</sub> permeation through the bicarbonate reversible reaction between CO<sub>2</sub> and –NH<sub>2</sub> 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. |
topic |
metal–organic framework mixed-matrix membrane interface engineering UiO-66-NH<sub>2</sub> |
url |
https://www.mdpi.com/2077-0375/11/6/419 |
work_keys_str_mv |
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