Priprava i karakterizacija geopolimernih filmova

undergraduate thesis

• Title (english): Preparation and characterisation of geopolymer films
• Author: Lucija Blažinić
• Mentor: Vilko Mandić (mentor)
• Committee member: Stanislav Kurajica (predsjednik povjerenstva)
• Committee member: Jelena Macan (član povjerenstva)
• Committee member: Petar Kassal (član povjerenstva)
• Granter: University of Zagreb; Faculty of Chemical Engineering and Technology; Zagreb
• Defense date and country: 2024-09-19, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Chemical Engineering

Abstract

Ovaj rad istražuje geopolimerne materijale koji su dobiveni miješanjem metakaolina, nastalog termičkom obradom kaolinitne gline i tri vrste vodenih stakala (Na, K i NaK). Termička obrada kaolinitne gline provedena je na 700 °C, čime je uspješno dobiven metakaolin, što je potvrđeno metodama XRD, TGA-DTA i ATR-FTIR. XRD analiza metakaolina pokazala je šire i manje intenzivne vrhove, što ukazuje na nižu razinu uređenja strukture u usporedbi s kaolinom. TGA/DTA spektar prikazao je značajan pad mase uzorka između 200 °C i 600 °C što odgovara dehidroksilaciji kaolina i stvaranju metakaolina. ATR-FTIR spektar potvrdio je izostanak karakterističnih pikova –OH skupina, što je dodatno dokazalo uspješnost termičke obrade. Geopolimeri su pripravljeni miješanjem metakaolina i vodenih stakala, a njihova strukturna i ostala svojstva analizirana su metodama XRD i ATR-FTIR. XRD analiza ukazuje na pretežno amorfno uređenje geopolimera, a varijacije intenziteta i pozicija maksimuna u FTIR spektrima ukazuju na različite kemijske sastave, ovisno o vrsti kationa prisutnih u vodenim staklima. FTIR spektri su potvrdili prisutnost silikatnih struktura s Si–O–Si vezama, s različitim vibracijama ovisno o specifičnom ionskom sastavu.
Geopolimeri su se istaknuli kao materijali s izvrsnim mehaničkim svojstvima, visokom kemijskom otpornošću i toplinskom stabilnošću. Njihova kation-izmjenjivačka i adsorpcijska svojstva čine ih izuzetno pogodnima za širok raspon primjena, posebno u građevinskoj industriji. Osim toga, zbog svoje ekološke prihvatljivosti i mogućnosti smanjenja emisije CO2, geopolimeri predstavljaju značajan korak prema održivijim građevinskim rješenjima.

Abstract (english)

This paper investigates geopolymeric materials obtained by mixing metakaolin, created by thermal treatment of kaolinite clay, and three types of water glasses (Na, K and NaK). Thermal treatment of kaolinite clay was carried out at 700 °C, which successfully obtained metakaolin, which was confirmed by XRD, TGA/DTA and ATR/FTIR methods. XRD analysis of metakaolin showed broader and less intense peaks, indicating a lower level of structural ordering compared to kaolin. The TGA/DTA spectrum showed a significant decrease in the mass of the sample between 200 °C and 600 °C, which corresponds to the dehydroxylation of kaolin and the formation of metakaolin. The ATR-/FTIR spectrum confirmed the absence of characteristic peaks of –OH groups, which additionally proved the success of the thermal treatment. Geopolymers were prepared by mixing metakaolin and water glasses, and their structural and other properties were analyzed by XRD and ATR-FTIR methods. XRD analysis indicates a predominantly amorphous arrangement of geopolymers, and variations in the intensity and position of the maxima in the FTIR spectra indicate different chemical compositions, depending on the type of cations present in the water glasses. FTIR spectra confirmed the presence of silicate structures with Si–O–Si bonds, with different vibrations depending on the specific ionic composition.
Geopolymers have stood out as materials with excellent mechanical properties, high chemical resistance and thermal stability. Their cation-exchange and adsorption properties make them extremely suitable for a wide range of applications, especially in the construction industry. In addition, due to their environmental friendliness and ability to reduce CO2 emissions, geopolymers represent a significant step towards more sustainable construction solutions.

• Keywords: geopolimer; vodeno staklo; amorfna struktura; tanki film
• Keywords (english): geopolymer; water glass; amorphous structure; thin film
• Language: croatian
• URN:NBN: urn:nbn:hr:149:863689
• Study programme: Title: Applied Chemistry - Undergraduate study; specializations in: Environmental chemistry and green technologies, Advanced materials and technologies, Applied organic chemistry; Course: Advanced materials and technologies; Study programme type: university; Study level: undergraduate; Academic / professional title: sveučilišni/a prvostupnik/prvostupnica (baccalaureus/baccalaurea) primijenjene kemije (sveučilišni/a prvostupnik/prvostupnica (baccalaureus/baccalaurea) primijenjene kemije)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Open access
• Created on: 2024-11-16 22:55:54