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Title:Odstranjevanje težkih kovin s pomočjo magnetnih nanodelcev : diplomsko delo univerzitetnega študijskega programa I. stopnje
Authors:Bajra, Rahil (Author)
Leitgeb, Maja (Mentor) More about this mentor... New window
Primožič, Mateja (Co-mentor)
Kravanja, Gregor (Co-mentor)
Files:.pdf UN_Bajra_Rahil_2019.pdf (1,70 MB)
MD5: D9FCAE829D862B351F801E59E56B17FD
 
Language:Slovenian
Work type:Bachelor thesis/paper (mb11)
Typology:2.11 - Undergraduate Thesis
Organization:FKKT - Faculty of Chemistry and Chemical Engineering
Abstract:Namen diplomskega dela je bila odstranitev kromovih (VI) ionov (Cr(VI)) iz vodnega medija s postopkom adsorpcije na maghemitne nanodelce, prevlečene s hitozanom ali CM-dekstranom. Najprej smo si pripravili maghemitne nanodelce, ki smo jih potem prevlekli s hitozanom po postopku mikroemulzije. Za primerjavo smo na maghemitne nanodelce s kovalentno vezavo vezali tudi CM-dekstran. Tako pripravljene magnetne nanodelce smo uporabili kot adsorbent za odstranjevanje Cr(VI) iz vodne raztopine. Odstranjevanja Cr(VI) iz vodne raztopine smo izvajali v šaržnem in cevnem reaktorju z obtokom. Pri tem smo kot adsorbent uporabili hitozanske ali dekstranske magnetne nanodelce. Ugotovili smo, da se sčasoma povečuje delež odstranjenega Cr(VI) iz vodne raztopine ob uporabi hitozanskih in dekstranskih nanodelcev. V primeru uporabe šaržnega reaktorja so se dekstranski magnetni nanodelci izkazali kot boljši adsorbent za odstranjevanje Cr(VI) od hitozanskih. S hitozanskimi nanodelci smo odstranili več Cr(VI) iz vodne raztopine v enakem časovnem intervalu v primeru uporabe cevnega reaktorja. Proučevali smo tudi vpliv hitrosti pretoka v cevnem reaktorju na delež odstranjenega Cr(VI). Ugotovili smo, da hitrost pretoka ne vpliva na adsorpcijo pri danih proučevanih pogojih. Kadar smo za odstranjevanje Cr(VI) uporabili cevni reaktor z obtokom, smo dosegli še večji učinek adsorpcije, saj se z vsakim obtokom poveča delež odstranjenega Cr(VI) iz vodne raztopine, saj je na voljo še aktivnih mest za vezavo adsorbata.
Keywords:krom, kromovi (VI) ioni, maghemitni nanodelci, hitozanski nanodelci, dekstranski nanodelci, adsorpcija.
Year of publishing:2019
Place of performance:Maribor
Publisher:[R. Bajra]
Number of pages:X, 27 str.
Source:Maribor
UDC:628.316.12:66.081.3(043.2)
COBISS_ID:22682646 New window
NUK URN:URN:SI:UM:DK:GWDEBFGY
Views:391
Downloads:64
Metadata:XML RDF-CHPDL DC-XML DC-RDF
Categories:KTFMB - FKKT
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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:22.09.2019

Secondary language

Language:English
Title:Removal of heavy metals with magnetic nanoparticles
Abstract:The main ideology of the bachelor’s thesis was to remove chromium (VI) ions (Cr(VI)) from the water medium with the process of adsorption on maghemite nanoparticles laced with chitosan or dextran. Firstly, maghemite nanoparticles were prepared. Then, they were coated with chitosan using a microemulsion process. For comparison, dextran was bound to maghemite nanoparticles with the use of covalent bonding. Nanoparticles prepared with the method mentioned above were then used as a removal adsorbent Cr(VI) from the water solution. Removal of Cr(VI) from water solution was carried out in a batch reactor and a tubular reactor with circulation. Chitosan or dextran nanoparticles were used as adsorbents. We concluded that the proportion of removed Cr (VI) from water solution increases with the use of chitosan and dextran nanoparticles over time. Batch reactor with dextran nanoparticles proved to be a better adsorbent for removing Cr(VI) than chitosan nanoparticles. With chitosan nanoparticles, we removed more Cr(VI) from water solution in the same time period when using a tubular reactor. We also observed the speed of the flow in the tubular reactor. We found that the speed of the flow does not affect the adsorption at studied conditions. When a tubular reactor was used for Cr(VI) removal, a bigger adsorption effect was achieved, since with each circulation the ratio of removed Cr(VI) increases as there were still active sites for the adsorbate binding.
Keywords:chromium, chromium (VI) ions, maghemite nanoparticles, nanoparticles, chitosan nanoparticles, dextran nanoparticles, adsorption.


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