Utjecaj funkcionalizacije nanočestica željeza na sorpciju iona Er(III) u vodenim otopinama

master's thesis

• Title (english): Effect of iron nanoparticles functionalization on Er(III) ion sorption from aqueous solutions
• Author: Matilda Čirjak
• Mentor: Sanda Rončević (mentor)
• Committee member: Sanda Rončević (predsjednik povjerenstva)
• Committee member: Ines Primožič (član povjerenstva)
• Committee member: Biserka Prugovečki (član povjerenstva)
• Committee member: Ivan Nemet (član povjerenstva)
• Granter: University of Zagreb; Faculty of Science; (Department of Chemistry); Zagreb
• Defense date and country: 2024-01-29, Croatia
• Scientific / art field, discipline and subdiscipline: NATURAL SCIENCES; Chemistry

Abstract

Erbijevi spojevi najviše se koriste u izradi optičkih vodiča, lasera i u nuklearnim industrijama te stoga dospijevaju u okoliš. Zbog ograničenih resursa, učinkovito odvajanje erbija predmet je brojnih istraživanja. U ovom radu provedeni su u vodenom mediju eksperimenti sorpcije iona Er3+ pri različitim početnim koncentracijama na neutralnim nanočesticama željeza (nZVI) i nanočesticama željeza modificiranim s dipikolinskom kiselinom (nZVI/PDCA). Nefunkcionalizirane neutralne nanočestice željeza nZVI pokazale su iznimnu efikasnost sorpcije iona erbija (97-99 %) dok su modificirane čestice nZVI/PDCA pri istim dodanim koncentracijama iona erbija u vodenoj otopini za 16 % manje efikasne. Morfološke značajke nefunkcionaliziranih i modificiranih nanočestica prije i nakon sorpcije iona Er3+ dobivene metodom SEM ukazuju na sferične lančaste strukture nemodificiranih nanočestica te sitnije eliptične nakupine modificiranih nanočestica. Utvrđene razlike u morfologiji kod obje vrste čestica pridonose razumijevanju mogućih mehanizama sorpcije.

Abstract (english)

Erbium compounds are mostly used in the production of optical guides, lasers and in the nuclear industry, and therefore end up in the environment. Due to limited resources, the efficient separation of erbium is the subject of numerous investigations. In this work, Er3+ ion sorption experiments in an aqueous medium at different initial concentrations on neutral iron nanoparticles (nZVI) and particles modified with dipicoline acid (nZVI/PDCA) were carried out. Non-functionalized nZVI nanoparticles showed exceptional erbium ion sorption efficiency (97-99 %), while modified nZVI/PDCA nanoparticles at the same added concentrations of erbium ions in water are 16% less efficient compared to non-functionalized nZVI particles. Morphological features of neutral iron nanoparticles and nanoparticles modified with dipicoline acid before and after Er3+ ion sorption obtained by the SEM method indicate spherical chain structures of bare particles and smaller elliptical clusters of modified particles. The determined differences in the morphology of both types of nanoparticles contribute to the understanding of possible sorption mechanisms.

• Keywords: erbij; funkcionalizacija; karakterizacija; nanočestice; sorpcija
• Keywords (english): characterization; erbium; functionalization; nanoparticles; sorption
• Language: croatian
• URN:NBN: urn:nbn:hr:217:885979
• Study programme: Title: Graduate university studies in chemistry; specializations in: Graduate university studies in chemistry; Course: Graduate university studies in chemistry; Study programme type: university; Study level: graduate; Academic / professional title: sveučilišni/a magistar/magistra kemije (sveučilišni/a magistar/magistra kemije)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Embargoed access; Embargo expiration date: 2026-01-29
• Created on: 2024-02-08 11:47:46