A high ZIF-8 loading PVA mixed matrix membrane on alumina hollow fiber with enhanced ethanol dehydration

Gui, Lin; Chen, Yirui; Chang, Ta-Hsuan; Huang, Tzu-Ling; Zhuang, Guo-Liang; Huang, Wei-Zhi; Liu, Yu‐Cheng; Matsuyama, Hideto; Wu, Kevin C.‐W.; Tung, Kuo‐Lun

doi:10.1016/j.memsci.2020.118935

Cited by 22 publications

(10 citation statements)

References 37 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The pervaporation results for the UTSA-280 membranes, based on mass flux and water permeability, are presented in Figure 3b and S6, alongside comparative data from other MOF-based membranes. [42][43][44][45][46][47][48][49][50][51][52] Comprehensive details of these membranes, including thickness and water permeability, are summarized in Table S3. The UTSA-280 membrane exhibits an exceptional water-toethanol separation factor (33,201), thereby surpassing the performance of both pure MOF membranes and MOFbased mixed matrix membranes.…”

Section: Methodsmentioning

confidence: 99%

Fast Water Transport in UTSA‐280 via a Knock‐Off Mechanism

Hsu

Lee

et al. 2023

Angew Chem Int Ed

View full text Add to dashboard Cite

Water and other small molecules frequently coordinate within metal‐organic frameworks (MOFs). These coordinated molecules may actively engage in mass transfer, moving together with the transport molecules, but this phenomenon has yet to be examined. In this study, we explore a unique water transfer mechanism in UTSA‐280, where an incoming water molecule can displace a coordinated molecule for mass transfer. We refer to this process as the 'knock‐off' mechanism. Despite UTSA‐280 possessing one‐dimensional channels, the knock‐off transport enables water movement along the other two axes, effectively simulating a pseudo‐three‐dimensional mass transfer. Even with a relatively narrow pore width, the knock‐off mechanism enables a water flux in the UTSA‐280 membrane. The knock‐off mechanism also renders UTSA‐280 superior water/ethanol diffusion selectivity for pervaporation. To validate this unique mechanism, we conducted 1H and 2H solid‐state NMR on UTSA‐280 after the adsorption of deuterated water. We also derived potential energy diagrams from the density functional theory to gain atomic‐level insight into the knock‐off and the direct‐hopping mechanisms. The simulation findings reveal that the energy barrier of the knock‐off mechanism is marginally lower than the direct‐hopping pathway, implying its potential role in enhancing water diffusion in UTSA‐280.

show abstract

Section: Methodsmentioning

confidence: 99%

Fast Water Transport in UTSA‐280 via a Knock‐Off Mechanism

Hsu

Lee

et al. 2023

Angew Chem Int Ed

View full text Add to dashboard Cite

show abstract

“…ZIFs have gained technical and scientific attention due to their pore-structural network, and have many potential applications in the fields of photocatalysis [103], drug delivery [104], pharmaceutical compounds separation [105,106], dye-wasted water treatment [107], oil-water separation [108], water purification [109,110], the pervaporation recovery of solvent vapors [109,[111][112][113], electrocatalysts [114], solvent-resistant nanofiltration [115], gas-liquid separation [116], natural gas separation [117][118][119] and so on. As described in Figure 2, MMMs may provide separation properties that can overcome the Robeson upper bound.…”

Section: Polymer/zif Mixed Matrix Membranesmentioning

confidence: 99%

Recent Advances in Polymer-Inorganic Mixed Matrix Membranes for CO2 Separation

Liu

Wong

et al. 2021

Polymers

View full text Add to dashboard Cite

Since the second industrial revolution, the use of fossil fuels has been powering the advance of human society. However, the surge in carbon dioxide (CO2) emissions has raised unsettling concerns about global warming and its consequences. Membrane separation technologies have emerged as one of the major carbon reduction approaches because they are less energy-intensive and more environmentally friendly compared to other separation techniques. Compared to pure polymeric membranes, mixed matrix membranes (MMMs) that encompass both a polymeric matrix and molecular sieving fillers have received tremendous attention, as they have the potential to combine the advantages of both polymers and molecular sieves, while cancelling out each other’s drawbacks. In this review, we will discuss recent advances in the development of MMMs for CO2 separation. We will discuss general mechanisms of CO2 separation in an MMM, and then compare the performances of MMMs that are based on zeolite, MOF, metal oxide nanoparticles and nanocarbons, with an emphasis on the materials’ preparation methods and their chemistries. As the field is advancing fast, we will particularly focus on examples from the last 5 years, in order to provide the most up-to-date overview in this area.

show abstract

“…Ethanol dehydration via pervaporation (PV) has attracted increasing attention due to the rapid development and application of ethanol biofuel [1][2][3]. Membrane is the key factor in the PV process to achieve high separation performance.…”

Section: Introductionmentioning

confidence: 99%

PVA-Based MMMs for Ethanol Dehydration via Pervaporation: A Comparison Study between Graphene and Graphene Oxide

Zhan

Gao

et al. 2022

Separations

View full text Add to dashboard Cite

Two different types of 2D nanosheets, including hydrophobic graphene (GR) and hydrophilic graphene oxide (GO), were filled into poly (vinyl alcohol) (PVA) polymers to prepare mixed matrix membranes (MMMs) for ethanol dehydration via pervaporation. The relationship between the physical/chemical properties of graphene and pervaporation performance of MMMs was investigated by a comparison of GR/PVA and GO/PVA MMMs in microstructure and PV performance. The incorporation of GO nanosheets into PVA reduced PVA crystallinity and enhanced the membrane hydrophilicity, while the incorporation of GR into PVA led to the opposite results. The incorporation of GR/GO into PVA depressed the PVA membrane swelling degree, and the incorporation of GR showed a more obvious depression effect. GR/PVA MMMs showed a much higher separation factor than GO/PVA MMMs, while they exhibited a much lower permeation flux than GO/PVA MMMs and pristine PVA membranes. The huge difference in microstructure and performance between GO/PVA and GR/PVA MMMs was strongly associated with the oxygen-containing groups on graphene lamellae. The higher permeation flux of GO/PVA MMMs was ascribed to the facilitated transport of water molecules induced by oxygen-containing groups and exclusive channels provided by GO lamellae, while the much lower permeation flux and higher separation factor GR/PVA MMMs was resulted from the smaller GR interplanar spacing (0.33 nm) and hydrophobicity as well as barrier effect of GR lamellae on the sorption and diffusion of water molecules. It was presumed that graphene intercalated with an appropriate number of oxygen-containing groups might be a good choice to prepare PVA-based MMMs for ethanol dehydration, which would combine the advantages of GR’s high interlayer diffusion selectivity and GO’s high permeation properties. The investigation might open a door to achieve both of high permeation flux and separation factor of PVA-based MMMs by tuning the microstructure of graphene.

show abstract

A high ZIF-8 loading PVA mixed matrix membrane on alumina hollow fiber with enhanced ethanol dehydration

Cited by 22 publications

References 37 publications

Fast Water Transport in UTSA‐280 via a Knock‐Off Mechanism

Fast Water Transport in UTSA‐280 via a Knock‐Off Mechanism

Recent Advances in Polymer-Inorganic Mixed Matrix Membranes for CO2 Separation

PVA-Based MMMs for Ethanol Dehydration via Pervaporation: A Comparison Study between Graphene and Graphene Oxide

Contact Info

Product

Resources

About