Karakterizacija nanočestica željeza pri sorpciji odabranih lantanoida pretražnom mikroskopijom

master's thesis

• Title (english): Electron microscopy characterization of iron nanoparticles used for sorption of selected lanthanides
• Author: Nikolina Beljan
• Mentor: Sanda Rončević (mentor)
• Committee member: Sanda Rončević (predsjednik povjerenstva)
• Committee member: Biserka Prugovečki (član povjerenstva)
• Committee member: Đani Škalamera (član povjerenstva)
• Committee member: Tomislav Jednačak (član povjerenstva)
• Granter: University of Zagreb; Faculty of Science; (Department of Chemistry); Zagreb
• Defense date and country: 2022-09-23, Croatia
• Scientific / art field, discipline and subdiscipline: NATURAL SCIENCES; Chemistry

Abstract

Tehnološki kritični elementi poput elemenata rijetkih zemalja i aktinoida imaju široku
primjenu u modernim tehnologijama. Zbog njihove velike potražnje i godišnje proizvodnje, ti
elementi se često ispuštaju u okoliš pri čemu se akumuliraju u organizmima. U posljednjem
desetljeću provode se iscrpna istraživanja s naglaskom na nanočestice željeza kao novim
materijalima za uklanjanje lantanoida iz vodenih sustava. Kako su nanočestice željeza
podložne oksidaciji, proučava se i površinska modifikacija s ciljem poboljšanja selektivnosti i
efikasnosti sorpcije metalnih iona. U ovom radu promatrana je efikasnost sorpcije iona Nd3+
,
Eu3+, Er3+, Gd3+, UO2
2+
na nanočestice elementarnog željeza te nanočestice modificirane
piridin-2,6-dikarboksilnom kiselinom. Pomoću spektrometrije masa uz induktivno spregnutu
plazmu (ICP-MS) promatrana je efikasnost sorpcije odabranih iona. Kako bi se utvrdila sama
morfologija nanočestica, provedena je strukturna analiza pomoću skenirajuće elektronske
mikroskopije (SEM) i mikroskopije atomskih sila (AFM). Utvrđeno je da sorpcija odabranih
iona na nanočestice te površinska modifikacija uvelike utječu na njihovu veličinu i strukturu.

Abstract (english)

Technologically critical elements such as rare earth elements and actinides are widely used in
modern technologies. Due to demanding production technologies and widespread use, these
elements are often released in the environment and bioaccumulated. Over the last decade,
zero-valent nanoparticles have been the focus of research in removal of lanthanides from
aqueous systems. However, nanoparticles tend to oxidize, therefore nanoparticles are often
surface modified in order to enhance selectivity and efficiency of sorption. In this work,
efficiency of neutral nanoparticles and nanoparticles modified with pyridine-2,6-dicarboxylic
acid for sorption of selected lanthanides (Nd3+, Eu3+, Er3+, Gd3+, UO2
2+
) was examined.
Efficiency of sorption from aqueous solutions was analyzed by inductively coupled plasma
mass spectrometry (ICP-MS). In order to determine the morphology of iron nanoparticles,
scanning electron microscopy (SEM) and atomic force microscopy (AFM) analysis were
performed. The obtained results showed that adsorption of selected ions on nanoparticles and
surface modification affect their size and structure.

• Keywords: lantanoidi; mikroskopija; nanočestice; sorpcija
• Keywords (english): lanthanides; microscopy; nanoparticles; sorption
• Language: croatian
• URN:NBN: urn:nbn:hr:217:248157
• Study programme: Title: Graduate university studies in chemistry; specializations in: Research programme; Course: Research programme; Study programme type: university; Study level: graduate; Academic / professional title: magistar/magistra kemije (magistar/magistra kemije)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Embargoed access; Embargo expiration date: 2024-09-23
• Created on: 2022-10-20 14:15:32