E-Locus - Institutional Repository of the University of Crete

Home Search

Results - Details

Search command : Author="Κουτσολέλος" And Author="Αθανάσιος"

Current Record: 6 of 125

[Add to Basket]

Title

Απομάκρυνση μεταλλικών ιόντων για περιβαλλοντικές εφαρμογές με χρήση υδρογελών

Alternative Title

Removal of metal ions using hydrogels for environmental aplications

Author

Γεωργίου, Σαλώμη

Thesis advisor

Κουτσολέλος, Αθανάσιος
Μητράκη, Άννα

Abstract

Peptide-based hydrogels are very useful materials due to their many properties, which place them in many fields of applications such as biomedical and environmental. In particular, they are easily synthesized, biodegradable, simple to use and through the adsorption technique they can effectively remove toxic pollutants such as nickel and cobalt metal ions, from polluted aqueous environments. At first, the dipeptide Fmoc-Phe-Leu-OH was synthesized and then studied for its ability to self-assemble into hydrogels following the good/bad solvent protocol. The solvent ratio was 3:7 with ethanol and water being the good and bad solvent respectively. The amount of dipeptide 2mg/ml and a solvent ratio of 3:7 ethanol/water were used to form the peptide-based hydrogel. Then, the produced hydrogel was used for the study of adsorption of toxic metal ions in aqueous environments. Furthermore, the reusability of the hydrogel was also tested through two different methods: (a) using Et₂O and (b) using EDTA. Both methods achieve the reusability of the hydrogel, however the second method with the EDTA seems to be more effective. In particular, during the first method, with the Et₂O, there is the possibility of reusing the hydrogel up to 2 times with high absorption rates and with the second method, with the EDTA, the reusability of the hydrogel is doubled as it can be reused up to 4 times with equally high absorption rates. As it was shown through this study, this hydrogel, during its first cycle of use, can absorb within a period of 3 days the 44.23% of Ni²⁺ metal ions from 1ml stock solution 0.1M and 40.67%. of Co²⁺ metal ions from 1ml stock solution 0.1M. During the second cycle it can absorb the 38.94% of Ni²⁺ metal ions from 1ml stock solution 0.1M and 29.51%. of Co²⁺ metal ions from 1ml stock solution 0.1M. Throughout the third cycle it can absorb the 38.94% of Ni²⁺ metal ions from 1ml stock solution 0.1M and 29.51%. of Co²⁺ metal ions from 1ml stock solution 0.1M. Finally, in the course of its fourth cycle of use it can absorb the 29.00% of Ni²⁺ metal ions from 1ml stock solution 0.1M and 20.46%. of Co²⁺ metal ions from 1ml stock solution 0.1M. Therefore, the peptide Fmoc-Phe-Leu-OH forms well-structured hydrogels capable of absorbing toxic metal ions and due to their biodegradation, they have great perspectives in environmental applications such as the depollution of aqueous environments.

Language

English

Subject

Cobalt (Co2+)

Depollution hydrogels

Nickel (Ni2+)

Nικέλιο(Ni2+)

Peptide synthesis

Porphyrin synthesis

peptide hydrogels

Κοβάλτιο (Co2+)

Πεπτιδικές υδρογέλες