Back to Search
Start Over
Property Characterization and Mechanism Analysis of Polyoxometalates-Functionalized PVDF Membranes by Electrochemical Impedance Spectroscopy
- Source :
- Membranes, Volume 10, Issue 9, Membranes, Vol 10, Iss 214, p 214 (2020)
- Publication Year :
- 2020
-
Abstract
- Polyoxometalates (POMs) has proved its advantage in constructing high-performance nanocomposite membranes such as catalytic membranes, adsorptive membranes, and forward osmosis membranes. However, it is challenging or tedious to characterize its distribution and effect on the membrane structures due to the equipment resolution limitation, discrete nano-scaled structures of POMs, and limited doping amount compared to the polymeric membrane matrix. In this paper, POMs-functionalized polyvinylidene fluoride (PVDF) membranes were fabricated by phase inversion combined with the sol-gel method, and electrochemical impedance spectroscopy (EIS) was utilized to analyze the nanocomposite membrane intrinsic properties. Through adjusting the additives in the sol-forming process, a set of membranes with varied intrinsic properties were developed accordingly. The wetting degree of the membranes related to the hydrophilic nature of the membrane surfaces had a crucial influence on the impedance measurements at the early stage. Through EIS analysis, it was demonstrated that the amination of the membrane matrix through (3-aminopropyl)trimethoxysilane (APTMS) treatment and the immobilization of POMs through electrostatic attraction would not generate new pore structures into the membrane and only alter the membrane surface roughness and composition. To my knowledge, it is the first time that EIS was utilized to characterize the hydrophilicity of the membranes and pore structures of the POMs-modified membranes. Our findings indicate that EIS can provide valuable information for probing the structures of other nano-materials-incorporated membranes.
- Subjects :
- Materials science
Forward osmosis
Filtration and Separation
02 engineering and technology
lcsh:Chemical technology
010402 general chemistry
01 natural sciences
Article
chemistry.chemical_compound
Chemical Engineering (miscellaneous)
lcsh:TP1-1185
polyoxometalates
lcsh:Chemical engineering
Phase inversion (chemistry)
membrane
Nanocomposite
Process Chemistry and Technology
APTMS
Doping
PVDF
lcsh:TP155-156
021001 nanoscience & nanotechnology
Polyvinylidene fluoride
0104 chemical sciences
Dielectric spectroscopy
Membrane
electrochemical impedance spectroscopy
chemistry
Chemical engineering
Wetting
0210 nano-technology
Subjects
Details
- ISSN :
- 20770375
- Volume :
- 10
- Issue :
- 9
- Database :
- OpenAIRE
- Journal :
- Membranes
- Accession number :
- edsair.doi.dedup.....925c2806741ba8ca9efa8c018522b965