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DKUM
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Title:
Karakterizacija zeta potenciala votlo-vlaknastih membran
Authors:
ID
Petek Regoršek, Vita
(Author)
ID
Petrinić, Irena
(Mentor)
More about this mentor...
Files:
MAG_Petek_Regorsek_Vita_2018.pdf
(2,95 MB)
MD5: 7EF63FA339334C1947C10BF38B71968C
PID:
20.500.12556/dkum/f1e82d1d-177b-4553-9516-0fb3d46c8ab1
Language:
Slovenian
Work type:
Master's thesis/paper
Typology:
2.09 - Master's Thesis
Organization:
FKKT - Faculty of Chemistry and Chemical Engineering
Abstract:
Zeta potencial dobiva vse večji pomen pri karakterizaciji površinskih lastnosti in učinkovitosti filtrov in membran, ki se uporabljajo v različnih procesih čiščenja vode. Poleg ploskovnih membran so pogosteje uporabljene polimerne membrane v obliki kapilar (membrane votlih vlaken). Kompleksna geometrija votlo-vlaknastih membran ter pomembnost karakterizacije notranje in zunanje površine izzove analitsko metodo površinskega zeta potenciala. Do danes je analiza površinskega naboja ploščatih membran s pomočjo pretočnega potenciala in pretočnih meritev že zelo dobro raziskana, medtem ko je karakterizacija zunanje površine votlo-vlaknastih membran še ostaja nepojasnejena. Namen naloge je pridobiti kvantitativne rezultate zeta poteniciala za zunanjo površino votlo-vlaknastih (ang. hollow fibre (HF)) polimernih membran. Primerjava dobljenih rezultatov za serijo HF membran za ultrafiltracijo s tistimi, dobljenimi za ploščate membrane iz istega polimera, bodo razjasnile učinke vgradnje vzorcev v merilno celico za določanje zeta potenciala. Da bi raziskali ta problem, smo določili zeta potencial za tri polimerne materiale: polietersulfon (ploska membrana), polietersulfon (HF) in poliviniliden fluorid (HF) za mikrofiltracijo ter ultrafiltracijo. Rezultati zeta potenciala za HF membrane so potrdili, da je možna karakterizacija zunanje površine HF membrane. Rezultati so pokazali tudi večje razlike med zeta potencialom zunanje strani FS in HF PES membrane. Pri merjenju pH v odvisnosti od zeta potenciala smo določili izoelektrično točko tako za FS kot tudi za HF membrane.
Keywords:
Votlo-vlaknaste membrane
,
porozne membrane
,
karakterizacija membran
,
elektrokinetična karakterizacija
,
zeta potencial
,
pretočni tok.
Place of publishing:
Maribor
Publisher:
[V. Petek Regoršek]
Year of publishing:
2018
PID:
20.500.12556/DKUM-70492
UDC:
[544.638:678.74-486.32]:66.081.6(043.2)
COBISS.SI-ID:
21480214
NUK URN:
URN:SI:UM:DK:CAFPU1OD
Publication date in DKUM:
07.06.2018
Views:
2197
Downloads:
186
Metadata:
Categories:
KTFMB - FKKT
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:
PETEK REGORŠEK, Vita, 2018,
Karakterizacija zeta potenciala votlo-vlaknastih membran
[online]. Master’s thesis. Maribor : V. Petek Regoršek. [Accessed 26 March 2025]. Retrieved from: https://dk.um.si/IzpisGradiva.php?lang=eng&id=70492
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Licences
License:
CC BY-NC-ND 4.0, Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International
Link:
http://creativecommons.org/licenses/by-nc-nd/4.0/
Description:
The most restrictive Creative Commons license. This only allows people to download and share the work for no commercial gain and for no other purposes.
Licensing start date:
15.05.2018
Secondary language
Language:
English
Title:
Zeta potential characterization of hollow fiber membranes
Abstract:
The zeta potential receives increasing significance in the characterization of the surface properties and performance of filters and membranes used in various water purification processes. Besides flat sheet membranes, polymer membranes in the shape of capillaries (hollow fiber membranes) are used more frequently. The complex geometry of hollow fiber membranes as well as the importance to characterize both the inner and outer surfaces challenge the analytical method of the surface zeta potential. While the analysis of the surface charge of flat sheet membranes by means of streaming potential and streaming current measurements is well established today, the characterization of the outer surface of hollow fiber membranes still remains qualitative. The aim of this thesis is to obtain quantitative zeta potential results for the outer surface of polymer hollow fiber (HF) membranes. A correlation of results obtained for a series of HF membranes for ultrafiltration with those obtained for flat sheet membranes made of the same polymer shall elucidate the effects of sample mounting and membrane porosity on the determination of the zeta potential. In order to investigate this problem, the zeta potential was determined for the three polymeric materials: polyethersulfone (flat sheet), polyethersulfone (HF) and polyvinylidene fluoride (HF) for microfiltration and ultrafiltration. Results of zeta potential for HF membranes confirmed that characterization of outer surface of HF membrane is possible.
Keywords:
Hollow fiber membranes
,
porous membranes
,
membrane characterization
,
electrokinetic characterization
,
zeta potential
,
streaming current.
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