Poly(vinyl alcohol)/ZIF‐8‐NH₂ mixed matrix membranes for ethanol dehydration via pervaporation

Abstract

Ethanediamine-modified zeolitic imidazolate framework (ZIF)-8 particles ) is synthesized and incorporated in the poly(vinyl alcohol) (PVA) matrix to fabricate novel PVA/ZIF-8-NH 2 mixed matrix membranes (MMMs) for pervaporation dehydration of ethanol. The PVA/ZIF-8-NH 2 MMMs exhibit enhanced membrane homogeneity and separation performance because of the higher hydrophilicity and restricted agglomeration of the particles, as compared to corresponding MMMs loaded with unmodified particles. The effect of ZIF-8-NH 2 loading in the MMMs is studied and the MMM with a 7.5 wt % ZIF-8-NH 2 loading shows the best pervaporation performance for ethanol dehydration at 408C. Various characterization techniques (Fourier transform infrared, scanning electron microscope, contact angle, sorption test, etc.) are used to investigate the MMMs loaded with ZIF-8 and ZIF-8-NH 2 particles. The impact of operation conditions on pervaporation performance is also performed. The performance benchmarking shows that the MMMs have superior separation factors and comparable flux to most other PVA hybrid membranes.

Preparation of graphene oxide/poly(vinyl alcohol) composite membrane and pervaporation performance for ethanol dehydration

“…When GO addition exceed 2.0 wt%, the decrease in the separation factor may be due to the saturation limit of the GO load, and higher than this concentration cause agglomeration of GO, causing defects in the membrane. [40][41][42] The GOP-2.0 membrane is the best selection for further study, due to excellent separation factor and suitable ux. Fig.…”

Adjustable pervaporation performance of Zr‐MOF/poly(vinyl alcohol) mixed matrix membranes

“…Thus exploring the strategies for breaking the trade‐off effects is crucial for the fabrication of high‐performance PV membranes. Zhang and Wang modified ZIF‐8 particles with ethanediamine (EDA) and then incorporated them into PVA matrix for PV of 85 wt% ethanol, demonstrating improved separation performance due to enhanced hydrophilicity of ZIF‐8 and strong affinity to the PVA matrix. Xia et al .…”

Advanced Porous Materials in Mixed Matrix Membranes

“…Finally, the incorporation of ZIF‐7–NH 2 fillers simultaneously makes the neat polymer more permeable and more selective, surpassing the state‐of‐the‐art 2008 Robeson upper bound. The same strategy can be applied to other MOFs, such as ZIF‐8–NH 2 , UiO‐66–NH 2 ,[64b] and MIL‐53–NH 2 , to further improve the polymer–filler interfacial compatibility in MMMs.…”