Magnetna nanoceluloza iz praproti Polypodiophyta za odstranjevanje težkih kovin

diplomsko delo visokošolskega strokovnega študijskega programa I. stopnje

Urša Podgoršek (Author), Maja Leitgeb (Mentor), Katja Heržič (Co-mentor)

Abstract

Industrija močno vpliva na ekosistem, saj odpadne vode, ki vsebujejo težke kovine, pogosto niso pravilno prečiščene pred izpustom v okolje, zato so pomembne metode čiščenja. Najpogostejša je adsorpcija, saj je enostavna in učinkovita. Kot adsorbent se v zadnjem času vse bolj uporabljajo naravni polimeri, saj so biorazgradljivi. V diplomskem delu smo se osredotočili na magnentno nanocelulozo. Cilj diplomske naloge je bil uspešno izolirati nanocelulozo iz praproti Polypodiophyta in uspešno sintetizirati magnetno nanocelulozo s pomočjo železovih Fe(II) in Fe(III) ionov, katero smo nadalje uporabili kot adsorbent pri odstranjevanju težkih kovin iz vodnega medija. Potrebno je bilo določiti optimalne pogoje raztopine K2Cr2O7 in magnetne nanoceluloze za največji učinek adsorpcije. Osredotočili smo se na izbiro pH raztopine K2Cr2O7 in izbiro masne koncentracije adsorbenta. Uspešno smo pripravili magnetno nanocelulozo in jo nadalje uporabili pri odstranjevanju Cr(VI) iz vodnega medija. Ugotovili smo, da se Cr(VI) adsorbirajo v kislem mediju. Največji učinek adsorpcije smo dosegli pri pH vrednosti 3. Pri izbiri γ smo ugotovili, da večja kot je površina adsorbenta, hitreje se bodo Cr(VI) vezali na aktivna prosta mesta in prej bomo dosegli večje učinke adsorpcije. V našem primeru smo dosegli največji učinek adsorpcije pri γ magnetne nanoceluloze 5,00 mg/mL.

Keywords

nanoceluloza;magnetna nanoceluloza;težke kovine;krom;diplomske naloge;

Data

Language:	Slovenian
Year of publishing:	2024
Typology:	2.11 - Undergraduate Thesis
Organization:	UM FKKT - Faculty of Chemistry and Chemical Engineering
Publisher:	[U. Podgoršek]
UDC:	661.183.126(043.2)
COBISS:	212296707
Views:	0
Downloads:	18
Average score:	0 (0 votes)
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Other data

Secondary language:	English
Secondary title:	Magnetic nanocellulose from Polypodiophyta fern for the removal of heavy metals
Secondary abstract:	Industry has a significant impact on the ecosystem, as wastewater containing heavy metals is often not properly treated before being released into the environment, making purification methods essential. Adsorption is the most common method, as it is simple and effective. Recently, natural polymers have been increasingly used as adsorbents because they are biodegradable. In this thesis, we focused on magnetic nanocellulose. The purpose of the thesis was to successfully isolate nanocellulose from the Polypodiophyta fern and to successfully synthesize magnetic nanocellulose using iron Fe(II) and Fe(III) ions, which was subsequently used as an adsorbent for the removal of heavy metals from an aqueous medium. The optimal conditions for the K2Cr2O7 solution and magnetic nanocellulose needed to be determined for the maximum adsorption effect. We focused on selecting the pH of the K2Cr2O7 solution and the choice of adsorbent mass concentration. We successfully prepared magnetic nanocellulose and used it further for the removal of Cr(VI) from the aqueous medium. We found that Cr(VI) adsorb in an acidic medium, achieving the maximum effect at a pH value of 3. In selecting the mass concentration, we discovered that the larger the surface area of the adsorbent, the faster the Cr(VI) would bind to the active free sites, and the higher adsorption effects would be achieved sooner. In our case, we achieved the maximum adsorption effect at a γ of 5.00 mg/mL.
Secondary keywords:	nanocellulose;magnetic nanocellulose;heavy metals;chromium;
Type (COBISS):	Bachelor thesis/paper
Thesis comment:	Univ. v Mariboru, Fak. za kemijo in kemijsko tehnologijo
Pages:	1 spletni vir (1 datoteka PDF (IX, 26 f.))
ID:	24795666