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Publisher DOI: 10.3390/membranes10120412
Title: Characterization and performance of LbL-coated multibore membranes : zeta potential, MWCO, permeability and sulfate rejection
Language: English
Authors: Dillmann, Saskia 
Kaushik, Shambhavi Arvind 
Stumme, Jakob 
Ernst, Mathias  
Keywords: LbL coating;characterization of capillary membranes;zeta potential measurement;MWCO determination;multibore hollow fibre membranes
Issue Date: 10-Dec-2020
Publisher: Multidisciplinary Digital Publishing Institute
Source: Membranes 10 (12): 412 (2020)
Journal or Series Name: Membranes 
Abstract (english): 
The characterization of membranes is suitable to investigate changes in the membrane properties caused by Layer-by-Layer (LbL) modification. Besides permeability, rejection, and molecular-weight cut-off (MWCO), which give information about the modification of the separation behaviour of the membrane, the zeta potential is capable of describing the surface charge of the membrane and its variation impacted by the properties of the polyelectrolyte multilayers (PEM). In this study, a new method for zeta potential measurement of hollow fibre membranes with several capillaries was developed and further investigations on the LbL modification of such membranes were performed. The results showed that an LbL coating with 8 DL PDADMAC/PSS led to a significant increase in the membrane charge of more than 20 mV. The coating with a different number of polyelectrolyte (PE) layers showed a zig-zag behaviour, comparable to data from flat sheet studies. However, in contrast to most flat sheet membranes, the charge curve assumes a totally negative trajectory at neutral pH. Further experiments on the MWCO of the LbL-modified membrane showed a reduction in the pore diameter from approx. 20 nm to less than 2 nm, reaching the range of nanofiltration membranes. With information on both the zeta potential and the MWCO, it was found that the rejection mechanism in LbL-modified multibore membranes is a complex interplay between the sieving effect due to reduction in the pore diameter and the repulsion effect of the charged membrane.
DOI: 10.15480/882.3225
ISSN: 2077-0375
Other Identifiers: doi: 10.3390/membranes10120412
Institute: Wasserressourcen und Wasserversorgung B-11 
DVGW-Forschungsstelle TUHH 
Document Type: Article
Project: LbL-Modifikation von UF-Kapillarmembranen 
License: CC BY 4.0 (Attribution) CC BY 4.0 (Attribution)
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