magistrsko delo
Barbara Sitar (Avtor), Marjana Simonič (Mentor), Lidija Fras Zemljič (Komentor)

Povzetek

Namen magistrskega dela je bil modificirati vlakna iz aktivnega oglja z naravnim polimerom hitozanom. V nadaljevanju smo izvedli še študijo karakterizacije vlaken ter adsorpcijo kovin na modelnih in realnih kompostnih vodah. Vlakna smo modificirali z 1 % in 2 % raztopino hitozana. Med seboj smo primerjali nemodificirano referenčno vlakno aktivnega oglja in modificirani vlakni. S študijo karakterizacije smo želeli dokazati, da smo na vlakna uspešno vezali biopolimer hitozan, ki služi kot adsorber kovin. V ta namen smo posneli FTIR in Raman spektre modificiranih vlaken, vendar nismo dobili značilnih vrhov za hitozan. Razen tega smo izvedli potenciometrično titracijo in določili število amino skupin na posameznih vlaknih. Spomočjo polielektrolitske titracije smo spremljali desorpcijo hitozana iz površine vlaken in dokazali, da gre pri modifikaciji za ireverzibilno reakcijo. Modificirana vlakna smo v nadaljevanju uporabili za adsorpcijo Cu2+ in Zn2+ ionov, pričemer smo s hitrimi testi določili, da je pH= 5 najbolj optimalna vrednost za adsorpcijo izbranih kovinskih ionov. Vsebnost preostalih kovin v kopeli, po adsorpciji na modificirana vlakna smo določali s pomočjo AAS. Rezultati kažejo, da se na vlakna modificirana z 2 % raztopino hitozana, Zn2+ in Cu2+ ioni (pri začetnih koncentracijah < 20 mg/L) vežejo v tolikšni meri, da lahko očiščeno vodo spustimo v okolje. Referenčna nemodificirana vlakna pa Zn2+ in Cu2+ ne odstranijo zadostno. Pri realnih kompostnih vodah smo odstranili do 61,1 % cinka in 100 % bakra. Raziskava je pokazala, da je adsorpcija izbranih kovin na vlakna modificirana s hitozanom uspešnejša v primerjavi z adsorpcijo na referenčna vlakna.

Ključne besede

vlakna aktivnega oglja;modifikacija;hitozan;karakterizacija vlaken;kompostna voda;magistrske naloge;

Podatki

Jezik: Slovenski jezik
Leto izida:
Tipologija: 2.09 - Magistrsko delo
Organizacija: UM FKKT - Fakulteta za kemijo in kemijsko tehnologijo
Založnik: [B. Sitar]
UDK: 628.179.2:661.183.2(043.2)
COBISS: 19566358 Povezava se bo odprla v novem oknu
Št. ogledov: 1646
Št. prenosov: 122
Ocena: 0 (0 glasov)
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Ostali podatki

Sekundarni jezik: Angleški jezik
Sekundarni naslov: ZINC AND COPPER REMOVAL FROM WATER USING MODIFIED ACTIVATED CARBON CLOTH
Sekundarni povzetek: The aim of the master’s thesis was to modify the activated carbon fibres using the natural polymer chitosan. Further, the characterisation study of fibres and adsorption of metals from model and real compost water was performed. Fibres were modified with 1% and 2% chitosan solution. Modified fibres were then compared to unmodified referential activated carbon fibre. The characterisation study was performed in order to show that biopolymer chitosan, which serves as metal adsorbent, was successfully bonded on activated carbon fibres. For this purpose, FTIR and Raman spectra of the modified fibres were recorded; however, peaks that are typical for chitosan were not observed. With potentiometric titration, the number of amino groups on individual fibres was determined. By polyelectrolyte titration, desorption of chitosan from a fibre surface was monitored, which showed that irreversible reaction is typical for modification. Modified fibres were then used for adsorption of metals; and after performing quick tests, pH 5 was determined as the most optimal pH value for adsorption. The residual concentration of metals in water solution after the adsorption by modified fibres was determined with AAS. Results have shown that Zn2+ and Cu2+ were bonded (at initial concentration of < 20 mg/L) on activated carbon fibres modified with 2% chitosan solution in such extent, that treated model water can be released into the environment. Referential unmodified fibres do not remove Zn2+ and Cu2+ adequately. Otherwise, from real compost water up to 61,1 % of zinc and 100 % of copper was eliminated. However, the research has shown that adsorption of chosen metal ions on fibres modified with chitosan was more sucesful than adsorption on referential unmodified fibres.
Sekundarne ključne besede: activated carbon fibres;modification;chitosan;characterization fibres;compost water;
URN: URN:SI:UM:
Vrsta dela (COBISS): Magistrsko delo/naloga
Komentar na gradivo: Univ. v Mariboru, Fak. za kemijo in kemijsko tehnologijo
Strani: XI, 61 str.
ID: 9129676