Title (srp)

Uticaj termodinamičkih parametara na sintezu poroznih silikatnih materijala i njihova funkcionalna primena : doktorska disertacija

Author

Ivanović, Marija M., 1987-

Contributor

Radović, Ivona, 1974-
Nenadović, Snežana, 1977-
Kijevčanin, Mirjana, 1970-
Kljajević, Ljiljana, 1968-
Mirković, Miljana M., 1986-

Description (eng)

The main goal of this doctoral dissertation is the synthesis of porous aluminosilicatematerials for potential application in the field of environmental protection. Aluminosilicatematerials are environmentally friendly in terms of energy efficiency and low energy consumptionfor synthesis. The synthesis of such materials implies a reduction in the production of greenhousegases, i.e., CO2. In the first part of the doctoral dissertation, the thermodynamic characteristics ofhomogeneous solutions of alkaline activators were examined, on the basis of which molecularinteractions within the solution can be interpreted. The change of thermodynamic parameters(density, viscosity, refractive index and speed of sound) depending on temperature was monitored.Porous silicate materials were synthesized from the starting component (metakaolin-MK),an alkaline activator consisting of a solution of NaOH of different concentrations (2M-16M NaOH)and sodium silicate. The potential application is aimed at testing the adsorption properties of thesematerials for adsorption of heavy metals and the mechanical properties of the materials for potentialapplication in construction have been examined. The organic phase (Poly(vinyl alcohol) (PVA))was also crosslinked to improve the characteristics of the synthesized material.Changes in the structure of the synthesized material as well as the morphology of theprecursor powder particles and the microstructure of the synthesized samples were analyzed byvarious methods (X - ray diffraction analysis (XRD), Fourier-transform infrared spectroscopy(FTIR), Raman spectroscopy, Scanning electron microscopy (SEM)). The chemical composition ofthe starting materials and the synthesized material was performed by X - ray fluorescence analysis(XRF). XRD and Raman spectroscopy identified the phases and monitored the crystallite size andthe proportion of the amorphous phase in the synthesized porous silicate material. SEM examinedthe morphology of precursor powder particles, pore size and shape of synthesized porous materials,and the composition of powder particles and phases of both precursors and synthesized materialswas determined by energy dispersion spectroscopy (EDS). The particle size of the synthesizedmaterials was monitored by the laser method for determining the particle size. The specific surfacearea and porosity of the synthesized material were determined using the BET method. Thepolymerization process of alkali-activated material (AAM) was monitored by XRD and FTIRmethod. The synthesized polymeric materials were confirmed by the MALDI-TOF method. Thenatural radioactivity of the raw material, metaphase and polymeric material was also examined.Thermal analysis was performed using the TGA / DTA method. Characterization of thermallytreated samples as well as X-ray photoelectron spectroscopy (XPS) was also performed.

Description (srp)

Glavni cilj ove doktorske disertacije je sinteza poroznog aluminosilikatnog materijala zapotencijalnu primenu u oblasti zaštite životne sredine. Aluminosilikatni materijali ekološki suprihvatljivi u smislu energetske efiksanosti i male potrošnje energije za sintezu. Sinteza ovakvihmaterijala podrazumeva i smanjenje proizvodnje gasova sa efektom staklene bašte, odnosno CO2. Uprvom delu doktorske disertacije ispitivane su termodinamičke karakteristike homogenih rastvoraalkalnih aktivatora na osnovu kojih se mogu tumačiti molekulske interakcije unutar rastvora.Ispraćena je promena termodinamičkih parametara (gustine, viskoznosti, indeksa refrakcije i brzinezvuka) u zavisnosti od temperature.Porozni silikatni materijali sintetisani su od polazne komponente (metakaolin-MK), alkalnogaktivatora koji se sastoji od rastvora NaOH različitih koncentracija (2M-16M NaOH) i natrijumsilikata. Potencijalna primena usmerena je na ispitivanje adsorpcionih karakteristika ovih materijalaza adsorpciju teških metala i ispitane su mehaničke osobine materijala radi potencijalne primene ugrađevinarstvu. Umrežena je i organska faza (poli(vinil-alkohol)-(PVA)) radi poboljšanjakarakteristika sintetisanog materijala.Različitim metodama (rendgenska difrakciona analiza (XRD), Furijeova transformacijainfracrvena spektroskopija (FTIR), Raman spektorskopija, Skenirajuća elektronska mikroskopija,(SEM)) analizirane su promene strukture sintetisanog materijala kao i morfologije čestica prahovaprekursora i mikrostruktura sintetisanih uzoraka. Rendgenskom flurescentnom analizom (XRF)određen je hemijski sastav polaznih sirovina i sintetisanog materijala. XRD analizom i Ramanspektroskopijom izvršena je identifikacija faza i praćenje veličina kristalita i udela amorfne faze usintetisanom poroznom silikatnom materijalu. SEM metodom je ispitana morfologija česticaprahova prekursora, veličina i oblik pora sintetisanih poroznih materijala, a metodom energetskedisperzione spektroskopije (EDS) utvrđen je sastav čestica prahova i faza kako prekursora, tako isintetisanih materijala. Veličina čestica sintetisanih materijala praćena je laserskom metodom zaodređivanje veličine čestica. Određena je specifična površina i poroznost sintetisanog materijalapomoću BET metode. Ispraćen je proces polimerizacije alkalno-aktiviranog materijala (AAM)XRD i FTIR analizom. MALDI-TOF metodom potvrđeni su sintetisani polimerni materijali.Ispitana je i prirodna radioaktivnost materijala polazne sirovine, metafaze i polimernog materijala.Urađena je i termička analiza pomoću TGA/DTA metode. Takođe je urađena i karakterizacijatermički tretiranih uzoraka kao i rendgenska fotoelektronska spektroskopija (XPS)

Description (srp)

Tehnološko inženjerstvo - Hemijsko inženjerstvo / Technological engineering- Chemical Engineering Datum odbrane: 06.09.2021.

Object languages

Serbian

Date

2021

Rights

© All rights reserved

Subject

OSNO - Opšta sistematizacija naučnih oblasti, Hemijsko inženjerstvo

OSNO - Opšta sistematizacija naučnih oblasti, Ispitivanje materijala. Inženjerstvo materijala

thermodynamic parameters, porous materials, AAM, geopolymerization, TGA / DTA, PVA, adsorption, XRD, SEM, FTIR, BET, MALDI, Gamma spectroscopy

Identifiers