diplomsko delo
Kaja Gliha (Author), Mitja Kolar (Mentor)

Abstract

Globoka evtektična topila (DES) so nova vrsta ionskih tekočin, ki predstavljajo okolju prijaznejšo alternativo navadno uporabljenim organskim topilom. Z različnimi kombinacijami izhodnih spojin lahko vplivamo na kemijsko-fizikalne lastnosti pripravljenih DES, kar je uporabno za ekstrakcijo pri analizi vzorcev. V diplomski nalogi sem pripravila 4 DES z uporabo holin klorida kot akceptorja vodikove vezi ter različnih donorjev vodikove vezi (mlečna kislina, butan-1,4-diol, glicerol, etilenglikol). Vse DES sem uspešno sintetizirala na tri načine na osnovi metode segrevanja in mešanja ter različnih načinov sušenja. Za pripravljene DES sem vizualno ocenila stabilnost v časovnem obdobju 50 dni. Zaradi higroskopskih lastnosti DES sem s titracijo po postopku Karl Fischerja določila delež absorbirane vode. DES pripravljene iz sušenega holin klorida sem nato karakterizirala za nadaljno uporabo kot ekstrakcijska topila s FTIR in termično analizo. S FTIR spektrometrijo sem opazovala vodikove vezi v DES ter vpliv dodatka vode na obstoječe vodikove vezi in nastanek novih. Za pripravljene DES in DES s 25 % dodane vode (w/w) sem z dinamično termogravimetrijo ocenila termično stabilnost iz Tonset. Dolgoročno termično stabilnost sem določala 2 h pri 60 in 80 °C z izotermno termogravimetrijo.

Keywords

globoka evtektična topila;titracija Karl Fischer;FTIR spektrometrija;termična analiza;termogravimetrija;diplomska dela;

Data

Language: Slovenian
Year of publishing:
Typology: 2.11 - Undergraduate Thesis
Organization: UL FKKT - Faculty of Chemistry and Chemical Technology
Publisher: [K. Gliha]
UDC: 543.57-145.3(043.2)
COBISS: 75284995 Link will open in a new window
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Downloads: 316
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Other data

Secondary language: English
Secondary title: Properties of deep eutectic solvents and their applicability for analysis of real samples
Secondary abstract: Deep eutectic solvents (DES) are a new class of ionic liquids that provide an efficient, environmentally friendly alternative to conventionally used organic solvents. By using different combinations of starting components, we can control the physicochemical properties of the prepared DES, which is useful for extraction in the analysis of samples. In this work, I prepared 4 DES using choline chloride as hydrogen bond acceptor and different hydrogen bond donors (lactic acid, butane-1,4-diol, glycerol, ethylene glycol). I have successfully synthesized all DES by using 3 different preparation procedures based on heating and stirring and different types of drying. I visually evaluated the stability of the prepared DES over a period of 50 days. Since DES is hygroscopic, I determined the content of absorbed water by Karl Fischer titration. I then characterized DES, which was prepared using dried choline chloride, for further use as an extraction solvent by FTIR and thermal analysis. Using FTIR spectroscopy, I observed hydrogen bonds in DES and the effects of adding water on existing hydrogen bonds and the formation of new hydrogen bonds. Using dynamic thermogravimetry, I evaluated the thermal stability of Tonset for prepared DES and DES with 25 % water added (w/w). I also determined the long-term thermal stability using isothermal thermogravimetry for 2 h at 60 and 80 °C.
Secondary keywords: deep eutectic solvents;Karl Fischer titration;FTIR spectroscopy;thermal analysis;thermogravimetry;
Type (COBISS): Bachelor thesis/paper
Study programme: 1000373
Embargo end date (OpenAIRE): 1970-01-01
Thesis comment: Univ. v Ljubljani, Fak. za kemijo in kemijsko tehnologijo, UNI Kemija
Pages: 42 str.
ID: 13278699