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Title:Magnetna rastlinska nanoceluloza za učinkovito odstranjevanje onesnaževal : diplomsko delo visokošolskega strokovnega študijskega programa I. stopnje
Authors:ID Gajić, Tajda (Author)
ID Leitgeb, Maja (Mentor) More about this mentor... New window
ID Vasić, Katja (Comentor)
Files:.pdf VS_Gajic_Tajda_2025.pdf (6,04 MB)
MD5: 607F8748861C30E0C0541842E12B074A
 
Language:Slovenian
Work type:Bachelor thesis/paper
Typology:2.11 - Undergraduate Thesis
Organization:FKKT - Faculty of Chemistry and Chemical Engineering
Abstract:Onesnaževanje okolja z težkimi kovinami predstavlja vse večji globalni problem, saj se z naraščajočo industrializacije in urbanizacije njihova koncentracija v okolju povečuje. Zaradi njihove visoke toksičnosti v že zelo majhnih koncentracijah imajo negativne vplive na ljudi in okolje. Med različnimi metodami je se adsorpcija izkazala kot ena izmed najučinkovitejših, najpreprostejših in cenovno ugodnih tehnik. Kot absorbent se vse pogosteje uporabljajo biorazgradljivi polimeri, saj predstavljajo okolju prijazno in trajnostno alternativo v primerjavi z tradicionalnimi adsorbenti. V diplomskem delu smo se osredotočali predvsem na magnetno nanocelulozo, kot adsorbent za odstranjevanje kromovih ionov raztopine Kr2Cr2O7. Cilj diplomske naloge je bil izolirati nanocelulozni material iz praproti Polypodiophyta. Uspešno sintetizirali magnetno nanocelulozo s pomočjo železovih Fe(II) in Fe(III) ionov. Pripravljeni materialsmo nato uporabili pri odstranjevnaju kromovih ionov katero smo v nadaljevanju uporabili za odstranjevanje Cr(VI) ionov iz vodne raztopine. Določevali smo optimalne pogoje za največjo učinkovitost adsorpcije kromovih ionov, pri čemer smo se osredotočali na pH raztopine, koncentracijo kromovih ionov v vodni raztopini. Morfološke značilnosti adsorbenta pred in po adsorpciji smo analizirali z SEM analizo, TGA/DSC analizo in FTIR spektroskopijo. Za opis mehanizma adsorpcijskih procesov pa smo uporabili Freundlichovo in Langmuierjevo metodo. Rezultati so pokazali, da se kromovi ioni najboljše adsorbirajo v kislem mediju, saj je bil največji učinek adsorpcije dosežen pri pH v vrednosti 5, saj je dosegel kar 98,84 % učinkovitost adsorpcije. Določevanje vpliva masne koncentracije medija, smo prišli do ugotovitev, da večje število prostih mest na površini adsorbenta omogoča hitrejšo adsorpcijo kromovih ionov. V našem primeru je največji učinek adsorpcije dosegel pri koncentraciji 1,00 g/mL.
Keywords:magnetna nanoceluloza, krom, adsorpcija, težke kovine
Place of publishing:Maribor
Place of performance:Maribor
Publisher:[T. Gajić]
Year of publishing:2025
Number of pages:1 spletni vir (1 datoteka PDF (X, 37 str.))
PID:20.500.12556/DKUM-94331 New window
UDC:547.458.8:[66..081.3:546.76](043.2)
COBISS.SI-ID:255281923 New window
Publication date in DKUM:23.09.2025
Views:242
Downloads:56
Metadata:XML DC-XML DC-RDF
Categories:KTFMB - FKKT
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Licences

License:CC BY-NC 4.0, Creative Commons Attribution-NonCommercial 4.0 International
Link:http://creativecommons.org/licenses/by-nc/4.0/
Description:A creative commons license that bans commercial use, but the users don’t have to license their derivative works on the same terms.
Licensing start date:13.08.2025

Secondary language

Language:English
Title:Magnetic nanocellulose for efficient pollutant removal
Abstract:Environmental pollution whith heavy metals represents an increasing global problem as their concentration in the environment continous to rise due to growing inndustrialization and urbanization. Because of theit high toxicity, even at very low concentration, heavy metals have adverse effect on both human health and the environment. Among the various methods, adsorption has proven to be one of the most effective, simplest, and most cost-efficient techniques.In recant years, biodegradable polymers have been increasingly used as adsorbents, as they represent an anvironmentally friendly and sustainable alternative to traditional adsorbents. In this thesis was to isolate nanocellulosic material from ferns (Polypodiophyta). Magnetic nanocellulose was successfully synthesised using Fe(II) and Fe(III) ions. The prepared material was than applied for removal of chromium ions from aqueous solution. We determined the optimal conditions for maximum adsorption efficiency of chromium ions, focusing on the pH of the solution and the concentration of chromium ions in the aqueous medium. The morphological characteristics of the adsorbent before and after adsorption were analyzed using SEM, TGA/DSC analysis, and FTIR spectroscopy. To describe the mechanism of the adsorption process, Freundlich and Langmuir methodst were also applied. The results showed thta Cr(VI) was more effectively adsorbed in an acidic medium, whith the highest adsorption efficiency (98,84%) achieved at pH 5, in the experiments investigating the effect of mass concentration, it was observed that a greater number of available active sites on the adsorbent surface enable faster adsorption of chromium ions. In our case, the highest adsorption efficiency was obtained at a magnetic nanocellulose concentration of 1,00 g/mL.
Keywords:magnetic nanocellulose, chromium, adsorption, heavy metals


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