Vloga polisaharidne prevleke adsorbenta pri odstranjevanju težkih kovin iz vode

diplomsko delo univerzitetnega študijskega programa I. stopnje

Jan Gole (Author), Mateja Primožič (Mentor), Maja Leitgeb (Co-mentor), Katja Heržič (Co-mentor)

Abstract

Težke kovine so snovi, ki so za industrijo zelo pomembne in so se v zadnjih letih zaradi industrijskega in tehnološkega napredka začele vedno več uporabljati. Te snovi najdemo naravno v Zemljini skorji, vendar se je njihova koncentracija v naravi zaradi človekovih posredovanj v zadnjih letih močno povišala. Posledično je njihova prisotnost tudi v človeški prehrani, zlasti v vodi, vedno pogostejša. V majhnih količinah so nekatere od teh kovin seveda za človeka potrebne, vendar lahko v večjih količinah škodujejo zdravju. Obstaja več različnih metod za odstranjevanje težkih kovin iz vode, kot so kemijsko obarjanje, ionska izmenjava, filtracija in adsorpcija. Slednja je najpogostejša. Kot adsorbent se lahko uporablja več snovi, v diplomskem delu pa smo se osredotočili na magnetne nanodelce (MNPs) prevlečene s polisaharidno prevleko arabinogalaktana (AG). Namen diplomske naloge je bil uspešno sintetizirati MNPs s polisaharidno prevleko AG in določiti optimalne pogoje za odstranjevanje težkih kovin, zlasti kromovih ionov (Cr(VI)) iz vode. MNPs z AG prevleko smo pripravili z dvema različnima metodama, in sicer z metodo adsorpcije in z metodo zamreževalne tehnike. Najprej smo uspešno sintetizirali MNPs prevlečene z AG. Le-te smo nato uporabili za odstranjevanje Cr(VI) iz vodne raztopine. Z uporabo funkcionaliziranih MNPs, pridobljenih z metodo adsorpcije smo odstranili največ Cr(VI) iz vodne raztopine pri optimalnem pH reakcijskega medija 4, optimalni masi nanodelcev 50 mg in optimalni koncentraciji raztopine K2Cr2O7 5 g/L. Kadar smo kot adsorbent uporabili MNPs funkcionalizirane s postopkom zamreženja smo ugotovili, da je optimalen pH reakcijskega medija 3, da je optimalna masa magnetnih nanodelcev 30 mg in, da je optimalna koncentracija raztopine K2Cr2O7 0,75 mg/L.

Keywords

težke kovine;krom(VI);magnetni nanodelci;adsorpcija;arabinogalaktan;diplomske naloge;

Data

Language:	Slovenian
Year of publishing:	2022
Typology:	2.11 - Undergraduate Thesis
Organization:	UM FKKT - Faculty of Chemistry and Chemical Engineering
Publisher:	[J. Gole]
UDC:	620.3:549.25(043.2)
COBISS:	132710659
Views:	70
Downloads:	18
Average score:	0 (0 votes)
Metadata:

Other data

Secondary language:	English
Secondary title:	The role of polysaccharide adsorbent coating for heavy metals removal from water
Secondary abstract:	Heavy metals are substances that are very important for industry and have been increasingly used in recent years due to industrial and technological progress. These substances are found naturally in the Earth's crust, but their concentration in nature has increased significantly in recent years due to human interventions. As a result, their presence in the human diet, especially in water, is increasingly common. In small quantities, some of these metals are of course necessary for humans, but in larger quantities they can be harmful to health. There are several different methods for water purification, such as chemical precipitation, ion exchange, filtration and adsorption. The latter is the most common. Several substances can be used as an adsorbent, and in our thesis we focused on magnetic nanoparticles with a polysaccharide coating of arabinogalactan (AG). The aim of the thesis was to successfully synthesize magnetic nanoparticles with a polysaccharide coating AG and to determine the optimal conditions for the removal of heavy metals, especially chromium ions (Cr(VI)) from water. Magnetic nanoparticles with an AG coating were prepared using two different methods, the adsorption method and the crosslinking technique method. First, we successfully synthesized AG-coated magnetic nanoparticles. These were then used to remove Cr(VI) from the aqueous solution. Using functionalized magnetic nanoparticles obtained by the adsorption method, the maximum Cr(VI) removed from the aqueous solution was at the optimal pH of the reaction medium 4, the optimal weight of the nanoparticles 50 mg and the optimal concentration of the K2Cr2O7 solution 5 g/L. When magnetic nanoparticles functionalized by the cross-linking process were used as an adsorbent, we found that the optimal pH of the reaction medium is 3, that the optimal mass of magnetic nanoparticles is 30 mg, and that the optimal concentration of the K2Cr2O7 solution is 0.75 mg/L.
Secondary keywords:	heavy metals;chromium(VI);magnetic nanoparticles;adsorption;arabinogalactan;
Type (COBISS):	Bachelor thesis/paper
Thesis comment:	Univ. v Mariboru, Fak. za kemijo in kemijsko tehnologijo
Pages:	1 spletni vir (1 datoteka PDF (IX, 35 f.))
ID:	16709781