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Title:Učinkovitost sol-gel modificirane UF membrane za odstranjevanje ionov težkih kovin
Authors:ID Bračko, Tara (Author)
ID Lobnik, Aleksandra (Mentor) More about this mentor... New window
ID Bauman, Maja (Comentor)
Files:.pdf MAG_Bracko_Tara_2016.pdf (5,59 MB)
MD5: F6698FFE524EAF7681D95A5C2791BDA4
 
Language:Slovenian
Work type:Master's thesis/paper
Typology:2.09 - Master's Thesis
Organization:FS - Faculty of Mechanical Engineering
Abstract:Ultrafiltracija in nanofiltracija sta v zadnjem času tema številnih raziskav spreminjanja funkcionalnosti membran za selektivno odstranjevanje ionov težkih kovin predvsem zaradi zaostrovanja mejnih dovoljenih koncentracij za direktne izpuste odpadnih voda v okolje. Nameni raziskave so bili površinska modifikacija UF PVDF-4 membrane s sol-gel funkcionaliziranimi nanodelci, testiranje različnih izvedbenih tehnik površinskega nanosa ter primerjava učinkovitosti zadrževanja Pb2+ ionov iz modelne raztopine z modificirano UF membrano v primerjavi z nemodificirano UF in izbrano NF membrano. Testirana je bila tudi učinkovitost čiščenja membran ter preverjanje njihove stabilnosti z dolgotrajno filtracijo (7h). Karakterizacija sol-gel nanosov in membran je bila izvedena s ciljno izbranimi analiznimi metodami (BET; TEM; FT-IR; permeabilnost; NMWCO). Vrednotenje učinka zadrževanja Pb2+ ionov z uporabljenimi membranami se je izvedlo posredno z uporabo AAS analize. Rezultati so pokazali, da je naprševanje najprimernejša izvedbena tehnika površinske modifikacije membran z delci, sintetiziranimi pri pogojih TEOS:MPTMS=1:2, 50 °C. Tako modificirana membrana pri najprimernejšem delovnem tlaku 8 bar omogoča zadrževanje Pb2+ ionov do 88,2%, kar je do 20,5% več v primerjavi z izbrano NF membrano pri 20 bar. Kot najbolj učinkovito čistilno sredstvo se je izkazala raztopina citronske kisline.
Keywords:3-merkaptopropil trimetoksisilan, čiščenje membran, funkcionalizacija nanodelcev, nanofiltracija, površinska modifikacija membran, SiO2 nanodelci, ultrafiltracija
Place of publishing:Maribor
Publisher:[T. Bračko]
Year of publishing:2016
PID:20.500.12556/DKUM-63032 New window
UDC:544.725.022.822:628.349(043.2)
COBISS.SI-ID:20412694 New window
NUK URN:URN:SI:UM:DK:50TX7CNT
Publication date in DKUM:03.10.2016
Views:2156
Downloads:212
Metadata:XML DC-XML DC-RDF
Categories:KTFMB - FS
:
BRAČKO, Tara, 2016, Učinkovitost sol-gel modificirane UF membrane za odstranjevanje ionov težkih kovin [online]. Master’s thesis. Maribor : T. Bračko. [Accessed 25 March 2025]. Retrieved from: https://dk.um.si/IzpisGradiva.php?lang=eng&id=63032
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Secondary language

Language:English
Title:Efficiency of sol-gel modified UF membrane for heavy metal ion removal
Abstract:Recently, modification of functional properties of UF and NF membranes towards selective removal of heavy metal ions are topic of many research work, due to tightened legislation and lowered maximum allowed discharge limits of heavy metal directly into wastewater. In this study, surface modification of UF PVDF membrane with functionalized sol-gel nanoparticles was performed; and testing of different application techniques on membrane surface was studied. The efficiency of modified UF membranes, removing Pb2+ ions from model solution was evaluated and compared to the non-modified UF and chosen NF membrane. In order to regenerate membranes performance, cleaning agents were applied and evaluated. The stability of modified membranes was tested in long-term filtration (7h). Characterization of sol-gel coatings and membranes was performed with BET; TEM; FT-IR; permeability; NMWCO. Retention of Pb2+ ions was indirectly evaluated with AAS. The results show that spraying of functionalized particles, synthesized under conditions of TEOS:MPTMS=1:2 and T= 50 °C, is the most promising technique for membrane surface modification. The modified membrane retained up to 88,2% of Pb2+ ions at the most suitable working pressure 8 bar, which is by 20.5% more in comparison to the retention of selected NF membrane at 20 bar. The most efficient cleaning agent proved to be citric acid solution.
Keywords:3-mercaptopropyl trimethoxysilane, membrane cleaning, membrane surface modification, nanofiltration, nanoparticles functionalization, SiO2 nanoparticles, ultrafiltration


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