Sinteza in karakterizacija maghemitnih nanodelcev (gama-Fe[spodaj]2[spodaj]O3) za aplikacije v osmotskih procesih

diplomsko delo univerzitetnega študijskega programa I. stopnje

Vita Petek Regoršek (Author), Irena Ban (Mentor), Matjaž Kristl (Co-mentor)

Abstract

Cilj diplomske naloge je sintetizirati maghemitne nanodelce (γ-Fe2O3) oblečene s polietilenglikolom (PEG) in primernim osmotskim tlakom, ki so načrtovani za uporabo pri čiščenju vod z metodo napredne osmoze (FO). V diplomski nalogi smo izvedli tri različne postopke priprave magnetnih maghemitnih nanodelcev. Prav tako smo za oblačenje delcev uporabili surfaktant PEG s tremi različnimi molskimi masami. Glede na izbrane možnosti smo s pomočjo termogravimetrične analize (TGA) in rentgenske praškovne difrakcije (XRD) karakterizirali sintetizirane nanodelce. Iz rezultatov smo ocenili velikost nanodelcev s pomočjo Scherrerjeve enačbe. Prav tako so rezultati TGA in RTG analize pokazali, da pri segrevanju vzorcev pride do transformacije iz maghemita v hematit pri temperaturi okoli 600 °C, kar se ujema s podatki v literaturi. Meritve osmotskega tlaka pa so pokazale, da tako pripravljeni delci za načrtovano aplikacijo niso primerni, saj niso izkazovali dovolj velikega osmotskega tlaka pri načrtovanju vtoka pri FO.

Keywords

maghemiti;termogravimetrična analiza;rentgenska praškovna difrakcija;oblačenje delcev;

Data

Language:	Slovenian
Year of publishing:	2015
Typology:	2.11 - Undergraduate Thesis
Organization:	UM FKKT - Faculty of Chemistry and Chemical Engineering
Publisher:	[V. Petek Regoršek]
UDC:	66.091.3:[620.3:661.872'022](043.2)
COBISS:	19123222
Views:	1166
Downloads:	137
Average score:	0 (0 votes)
Metadata:

Other data

Secondary language:	English
Secondary title:	Synthesis and characterization of maghemite nanoparticles (γ-Fe2O3) for applications in osmotic processes
Secondary abstract:	The aim of the thesis is to synthesize maghemite nanoparticles (γ-Fe2O3) coated with polyethyleneglycol (PEG) and a suitable osmotic pressure, which are designed for use in cleaning water through the method of forward osmosis (FO). In the thesis, we carried out three different procedures for the preparation of magnetic maghemite nanoparticles. We also used surfactant PEG, with three different molecular weight. Depending on the selected options and with the help of thermogravimetric analysis (TGA) and X-Ray diffraction (XRD) we characterized synthesized nanoparticles. From the results the size of the nanoparticles can be estimated by Scherrer equation. The results of the TGA and XRD analysis have shown that while heating the samples a transformation occurs from maghemite to hematite at a temperature of around 600 °C, which corresponds with the data in the literature. Measurements of osmotic pressure have shown that the particles are not suitable for the intended application as they do not supply sufficient osmotic pressure for planning the draw solution in FO.
Secondary keywords:	maghemite;thermogravimetric analysis;X-Ray diffraction;coating of nanoparticles;
URN:	URN:SI:UM:
Type (COBISS):	Bachelor thesis/paper
Thesis comment:	Univ. v Mariboru, Fak. za kemijo in kemijsko tehnologijo
Pages:	X, 35 f.
ID:	8887772