Uticaj termodinamičkih parametara na sintezu poroznih silikatnih materijala i njihova funkcionalna primena
Influence of thermodynamic parameters on the synthesis of porous silicate materials and their functional application
Докторанд
Ivanović, Marija M.Ментор
Radović, IvonaЧланови комисије
Nenadović, SnežanaKijevčanin, Mirjana
Kljajević, Ljiljana
Mirković, Miljana M.
Метаподаци
Приказ свих података о дисертацијиСажетак
Glavni cilj ove doktorske disertacije je sinteza poroznog aluminosilikatnog materijala za
potencijalnu primenu u oblasti zaštite životne sredine. Aluminosilikatni materijali ekološki su
prihvatljivi u smislu energetske efiksanosti i male potrošnje energije za sintezu. Sinteza ovakvih
materijala podrazumeva i smanjenje proizvodnje gasova sa efektom staklene bašte, odnosno CO2. U
prvom delu doktorske disertacije ispitivane su termodinamičke karakteristike homogenih rastvora
alkalnih aktivatora na osnovu kojih se mogu tumačiti molekulske interakcije unutar rastvora.
Ispraćena je promena termodinamičkih parametara (gustine, viskoznosti, indeksa refrakcije i brzine
zvuka) u zavisnosti od temperature.
Porozni silikatni materijali sintetisani su od polazne komponente (metakaolin-MK), alkalnog
aktivatora koji se sastoji od rastvora NaOH različitih koncentracija (2M-16M NaOH) i natrijum
silikata. Potencijalna primena usmerena je na ispitivanje adsorpcionih karakteristika ovih materijala
za adso...rpciju teških metala i ispitane su mehaničke osobine materijala radi potencijalne primene u
građevinarstvu. Umrežena je i organska faza (poli(vinil-alkohol)-(PVA)) radi poboljšanja
karakteristika sintetisanog materijala.
Različitim metodama (rendgenska difrakciona analiza (XRD), Furijeova transformacija
infracrvena spektroskopija (FTIR), Raman spektorskopija, Skenirajuća elektronska mikroskopija,
(SEM)) analizirane su promene strukture sintetisanog materijala kao i morfologije čestica prahova
prekursora i mikrostruktura sintetisanih uzoraka. Rendgenskom flurescentnom analizom (XRF)
određen je hemijski sastav polaznih sirovina i sintetisanog materijala. XRD analizom i Raman
spektroskopijom izvršena je identifikacija faza i praćenje veličina kristalita i udela amorfne faze u
sintetisanom poroznom silikatnom materijalu. SEM metodom je ispitana morfologija čestica
prahova prekursora, veličina i oblik pora sintetisanih poroznih materijala, a metodom energetske
disperzione spektroskopije (EDS) utvrđen je sastav čestica prahova i faza kako prekursora, tako i
sintetisanih materijala. Veličina čestica sintetisanih materijala praćena je laserskom metodom za
određivanje veličine čestica. Određena je specifična površina i poroznost sintetisanog materijala
pomoću 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 karakterizacija
termički tretiranih uzoraka kao i rendgenska fotoelektronska spektroskopija (XPS)
The main goal of this doctoral dissertation is the synthesis of porous aluminosilicate
materials for potential application in the field of environmental protection. Aluminosilicate
materials are environmentally friendly in terms of energy efficiency and low energy consumption
for synthesis. The synthesis of such materials implies a reduction in the production of greenhouse
gases, i.e., CO2. In the first part of the doctoral dissertation, the thermodynamic characteristics of
homogeneous solutions of alkaline activators were examined, on the basis of which molecular
interactions 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 aime...d at testing the adsorption properties of these
materials for adsorption of heavy metals and the mechanical properties of the materials for potential
application 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 the
precursor powder particles and the microstructure of the synthesized samples were analyzed by
various methods (X - ray diffraction analysis (XRD), Fourier-transform infrared spectroscopy
(FTIR), Raman spectroscopy, Scanning electron microscopy (SEM)). The chemical composition of
the 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 and
the proportion of the amorphous phase in the synthesized porous silicate material. SEM examined
the 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 materials
was determined by energy dispersion spectroscopy (EDS). The particle size of the synthesized
materials was monitored by the laser method for determining the particle size. The specific surface
area and porosity of the synthesized material were determined using the BET method. The
polymerization process of alkali-activated material (AAM) was monitored by XRD and FTIR
method. The synthesized polymeric materials were confirmed by the MALDI-TOF method. The
natural radioactivity of the raw material, metaphase and polymeric material was also examined.
Thermal analysis was performed using the TGA / DTA method. Characterization of thermally
treated samples as well as X-ray photoelectron spectroscopy (XPS) was also performed.