2D korelacija FTIR i UV-Vis spektara uzoraka Zn2SiO4 dopiranih s Co

master's thesis

• Title (english): 2D correlation of FTIR and UV-Vis spectra of Co doped Zn2SiO4 samples
• Author: Andrej Terzin
• Mentor: Stanislav Kurajica (mentor)
• Committee member: Stanislav Kurajica (predsjednik povjerenstva)
• Committee member: Katarina Mužina (član povjerenstva)
• Committee member: Jelena Macan (član povjerenstva)
• Granter: University of Zagreb; Faculty of Chemical Engineering and Technology; Zagreb
• Defense date and country: 2022-11-30, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Basic Technical Sciences

Abstract

Kobalt je rijedak i skup kemijski element koji zbog svojih specifičnih svojstava u modernome svijetu pronalazi mnogobrojne primjene. Opće je poznato da je otrovan za ljude te da ima štetan utjecaj na okoliš te se stoga njegova uporaba pokušava svesti na što manje količine. Jedna od čestih primjena kobalta je proizvodnja pigmenata, budući da određenim kemijskim spojevima daje izrazito plavu boju. Kobaltno plavo jedan je od najvažnijih anorganskih plavih pigmenata. Ovaj rad bavi se ugradnjom kobalta u strukturu vilemita te tako pripravila čvrsta otopina koja ima boju poput kobaltno plavog ali ne predstavlja toliku opasnost po okoliš. Sol-gel sintezom pripremljeni su uzorci čistog vilemita te vilemita dopiranog sa s 0, 5, 10 i 15 mol% kobalta te su ispitana strukturna, termička i optička svojstva dobivenih produkata. Vilemit je pripravljen s dva seta prekursora; najprije s cink (II) acetatom i kobalt (II) acetatom, a kasnije s cink (II) nitratom i kobalt (II) nitratom. Uzorci su žareni na temperaturama od 800 do 1100 °C. Provedene su rendgenska difrakcijska analiza (XRD), infracrvena spektroskopija s Fourierovom transformacijom (FTIR), UV-Vis difuzna refleksijska spektroskopija DRS, kombinirana termogravimetrijska i diferencijalna toplinska analiza (TGA/DTA).

Abstract (english)

Cobalt is a rare and expensive chemical element that due to its specific properties, finds numerous applications in the modern world. It is generally known as an element toxic for humans and hazardous for the environment and therefore its use is being reduced to the smallest amount possible. One of the common applications of cobalt is that it is used as a pigment component due to its extremely blue colour in some chemical compounds. Cobalt blue is one of the most important inorganic blue pigments. This master's thesis deals with the incorporation of cobalt into the willemite structure in order to prepare solid solution with colour similar to cobalt blue but with reduced threat for environment. The sol-gel synthesis of willemite with different precursors and concentrations of cobalt was carried out, and the structural, thermal and optical properties of the obtained products were examined. Willemite was prepared with two sets of precursors; first with zinc (II) acetate and cobalt (II) acetate and later with zinc (II) nitrate and cobalt (II) nitrate. Samples of willemite doped with 0, 5, 10 and 15 mol% of cobalt were prepared. The samples were annealed at temperatures from 800 to 1100 °C. X-ray diffraction analysis (XRD), Fourier transform infrared spectroscopy (FTIR), UV-Vis diffuse reflectance spectroscopy DRS, combined thermogravimetric and differential thermal analysis (TGA/DTA) were performed.

• Keywords: vilemit; kobaltno plavo; dopiranje; sol-gel sinteza
• Keywords (english): willemite; cobalt blue; doping; sol-gel synthesis
• Language: croatian
• URN:NBN: urn:nbn:hr:149:536006
• Study programme: Title: Applied Chemistry - Graduate 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: graduate; Academic / professional title: magistar/magistra primijenjene kemije (magistar/magistra primijenjene kemije)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Open access
• Created on: 2023-02-15 15:22:23