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@PHDTHESIS{Kamp:957990,
author = {Kamp, Johannes},
othercontributors = {Wessling, Matthias and de Vos, Wiebe},
title = {{T}ailoring polyelectrolyte multilayer membranes for
advanced selectivities},
volume = {31},
school = {Rheinisch-Westfälische Technische Hochschule Aachen},
type = {Dissertation},
address = {Aachen},
publisher = {Aachener Verfahrenstechnik},
reportid = {RWTH-2023-05056},
series = {Aachener Verfahrenstechnik series - AVT.CVT - chemical
process engineering},
pages = {1 Online-Ressource : Illustrationen, Diagramme},
year = {2022},
note = {Veröffentlicht auf dem Publikationsserver der RWTH Aachen
University 2023; Dissertation, Rheinisch-Westfälische
Technische Hochschule Aachen, 2022},
abstract = {Nanofiltration plays an important role to tackle the
consequences of recent and upcoming water pollution and
scarcity. A novel and versatile material platform of
nanofiltration membrane synthesis represent
polyelectrolytes. Polyelectrolyte multilayer membranes are
produced via the alternating "Layer-byLayer" (LbL)
deposition of oppositely charged polymers, polycations and
polyanions. In comparison to state of the art polyamide
nanofiltration membranes, the LbL technique allows the
tailoring of the separation layer on a molecular level.
Therefore, the separation characteristics can be adjusted to
individual separation tasks. First, polyelectrolyte
multilayer hollow fiber membranes are fabricated with
defined excess charges, which impact the retention of ions.
A novel synthesis protocol is developed, which generates a
separation layer with high negative excess charge. The
negative fixed charges in the membrane material strongly
repel divalent anions. This negatively charged membrane is
further investigated to separate phosphates from effluents.
It is shown that the novel developed polyelectrolyte
multilayer membranes compete and even outperform state of
the art commercial polyamide flat sheet membranes in terms
of rejection and flux. The hollow fiber geometry
additionally allows backwashing and acid cleaning. In a next
step, the LbL technique is extended to even produce reverse
osmosis tubular membranes. Ceramic tubular support membranes
are coated with different variations of polyelectrolytes
with a high charge density and additional covalent
crosslinking. The resulting polymeric network forms dense
layers featuring low molecular weight cut-offs and high
rejections for monovalent salts. Those PEM-ceramic tubular
membranes feature excellent acid stability by the choice of
acid stable polyelectrolytes. The developed polyelectrolyte
multilayer membranes are tested successfully for the
treatment of harsh industrial process waters from a steel
pickling line. The acidic process waters contain
hydrofluoric as well as nitric acids, which were effectively
rejected. The coating protocol is optimized and scaled up.
Therefore, the industry scale PEM-ceramic composite
multi-channel membranes are tested in a long term pilot
on-site at a steel pickling line. The results in this thesis
prove that indeed, polyelectrolyte multilayer membranes with
separation characteristics can be tailored to a specific
applications. Thus, polyelectrolyte multilayer membranes
play a key role to more sustainable resource cycles and
improve the economic as well as the ecologic value of
membrane processes.},
cin = {416110},
ddc = {620},
cid = {$I:(DE-82)416110_20140620$},
typ = {PUB:(DE-HGF)11 / PUB:(DE-HGF)3},
doi = {10.18154/RWTH-2023-05056},
url = {https://publications.rwth-aachen.de/record/957990},
}
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