Characterization and Performance of LbL-Coated Multibore Membranes: Zeta Potential, MWCO, Permeability and Sulfate Rejection
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...
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| Format: | Article |
| Language: | English |
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MDPI AG
2020-12-01
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| Series: | Membranes |
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| Online Access: | https://www.mdpi.com/2077-0375/10/12/412 |
| _version_ | 1797545142326919168 |
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| author | Saskia Dillmann Shambhavi Arvind Kaushik Jakob Stumme Mathias Ernst |
| author_facet | Saskia Dillmann Shambhavi Arvind Kaushik Jakob Stumme Mathias Ernst |
| author_sort | Saskia Dillmann |
| collection | DOAJ |
| description | 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. |
| first_indexed | 2024-03-10T14:10:19Z |
| format | Article |
| id | doaj.art-fa49ddf82b0b4b62936eea07c0a35ba6 |
| institution | Directory Open Access Journal |
| issn | 2077-0375 |
| language | English |
| last_indexed | 2024-03-10T14:10:19Z |
| publishDate | 2020-12-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Membranes |
| spelling | doaj.art-fa49ddf82b0b4b62936eea07c0a35ba62023-11-21T00:15:38ZengMDPI AGMembranes2077-03752020-12-01101241210.3390/membranes10120412Characterization and Performance of LbL-Coated Multibore Membranes: Zeta Potential, MWCO, Permeability and Sulfate RejectionSaskia Dillmann0Shambhavi Arvind Kaushik1Jakob Stumme2Mathias Ernst3Institute for Water Resources and Water Supply, Hamburg University of Technology, Am Schwarzenberg-Campus 3, 20173 Hamburg, GermanyDVGW Research Centre TUHH, Am Schwarzenberg-Campus 3, 20173 Hamburg, GermanyDVGW Research Centre TUHH, Am Schwarzenberg-Campus 3, 20173 Hamburg, GermanyInstitute for Water Resources and Water Supply, Hamburg University of Technology, Am Schwarzenberg-Campus 3, 20173 Hamburg, GermanyThe 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.https://www.mdpi.com/2077-0375/10/12/412LbL coatingcharacterization of capillary membraneszeta potential measurementMWCO determinationmultibore hollow fibre membranes |
| spellingShingle | Saskia Dillmann Shambhavi Arvind Kaushik Jakob Stumme Mathias Ernst Characterization and Performance of LbL-Coated Multibore Membranes: Zeta Potential, MWCO, Permeability and Sulfate Rejection Membranes LbL coating characterization of capillary membranes zeta potential measurement MWCO determination multibore hollow fibre membranes |
| title | Characterization and Performance of LbL-Coated Multibore Membranes: Zeta Potential, MWCO, Permeability and Sulfate Rejection |
| title_full | Characterization and Performance of LbL-Coated Multibore Membranes: Zeta Potential, MWCO, Permeability and Sulfate Rejection |
| title_fullStr | Characterization and Performance of LbL-Coated Multibore Membranes: Zeta Potential, MWCO, Permeability and Sulfate Rejection |
| title_full_unstemmed | Characterization and Performance of LbL-Coated Multibore Membranes: Zeta Potential, MWCO, Permeability and Sulfate Rejection |
| title_short | Characterization and Performance of LbL-Coated Multibore Membranes: Zeta Potential, MWCO, Permeability and Sulfate Rejection |
| title_sort | characterization and performance of lbl coated multibore membranes zeta potential mwco permeability and sulfate rejection |
| topic | LbL coating characterization of capillary membranes zeta potential measurement MWCO determination multibore hollow fibre membranes |
| url | https://www.mdpi.com/2077-0375/10/12/412 |
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