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master's thesis
Taloženje i karakterizacija kalcijeva karbonata u sustavu s magnezijevim ionima
2023. urn:nbn:hr:182:830949
Andrašić, Marko
Josip Juraj Strossmayer University of Osijek
Department of Chemistry

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Andrašić, M. (2023). Taloženje i karakterizacija kalcijeva karbonata u sustavu s magnezijevim ionima (Master's thesis). Osijek: Josip Juraj Strossmayer University of Osijek, Department of Chemistry. Retrieved from https://urn.nsk.hr/urn:nbn:hr:182:830949

Andrašić, Marko. "Taloženje i karakterizacija kalcijeva karbonata u sustavu s magnezijevim ionima." Master's thesis, Josip Juraj Strossmayer University of Osijek, Department of Chemistry, 2023. https://urn.nsk.hr/urn:nbn:hr:182:830949

Andrašić, Marko. "Taloženje i karakterizacija kalcijeva karbonata u sustavu s magnezijevim ionima." Master's thesis, Josip Juraj Strossmayer University of Osijek, Department of Chemistry, 2023. https://urn.nsk.hr/urn:nbn:hr:182:830949

Andrašić, M. (2023). 'Taloženje i karakterizacija kalcijeva karbonata u sustavu s magnezijevim ionima', Master's thesis, Josip Juraj Strossmayer University of Osijek, Department of Chemistry, accessed 16 November 2024, https://urn.nsk.hr/urn:nbn:hr:182:830949

Andrašić M. Taloženje i karakterizacija kalcijeva karbonata u sustavu s magnezijevim ionima [Master's thesis]. Osijek: Josip Juraj Strossmayer University of Osijek, Department of Chemistry; 2023 [cited 2024 November 16] Available at: https://urn.nsk.hr/urn:nbn:hr:182:830949

M. Andrašić, "Taloženje i karakterizacija kalcijeva karbonata u sustavu s magnezijevim ionima", Master's thesis, Josip Juraj Strossmayer University of Osijek, Department of Chemistry, Osijek, 2023. Available at: https://urn.nsk.hr/urn:nbn:hr:182:830949

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Metadata
TitleTaloženje i karakterizacija kalcijeva karbonata u sustavu s magnezijevim ionima
Title (english)Precipitation and characterization of calcium carbonate in a system with magnesium ions
AuthorMarko Andrašić
MentorBrunislav Matasović (mentor)
Committee memberMarija Jozanović (predsjednik povjerenstva)
Committee memberBrunislav Matasović (član povjerenstva)
Committee memberTomislav Balić (član povjerenstva)
GranterJosip Juraj Strossmayer University of Osijek
Department of Chemistry
Osijek
Defense date and country2023-03-15, Croatia
Scientific / art field,
discipline and subdiscipline		NATURAL SCIENCES
Chemistry
Abstract
U ovom radu istraženo je djelovanje magnezijevih iona (Mg2+) na spontano taloženje kalcijeva karbonata (CaCO3) u sustavima početnih pH vrijednosti (pH0) u rasponu od 8,5 do 10,5 kao i na rast kristala kalcita na kristalnom sjemenu kalcita. Pri tom su svi relevantni parametri početnih taložnih sustava (početna prezasićenost, temperatura, ionska jakost te omjer aktiviteta kacijevih i karbonatnih iona u pokusima spontanog taloženja) bili isti. Napredovanje procesa taloženja praćeno je potenciometrijski, a dobiveni talozi su karakterizirani infracrvenom spektroskopijom i pretražnom elektronskom mikroskopijom. Dodatak Mg2+, u cijelom istraženom području pH0 vrijednosti uzrokovao je inhibiciju spontanog taloženja CaCO3, kao i promjenu morfologije te sastava taloga, s posebnim naglaskom na povećanje masenog udjela aragonita u talogu. Također, dodatak Mg2+ uzrokovo je inhibiciju rasta kalcita na kristalnom sjemenu kalcita kao i promociju rasta aragonita pri višim koncentracijama dodanog magnezija.
Abstract (english)
In this Diploma thesis, the effect of magnesium ions (Mg2+) on the spontaneous precipitation of calcium carbonate (CaCO3) in systems with initial pH values (pH0) ranging from 8.5 to 10.5, was investigated as well as its effect on the crystal growth of calcite on calcite seed crystals. All relevant initial parameters of the precipitation systems (initial supersaturation, temperature, ionic strength but also activity ratio of calcium and carbonate ions in spontaneous precipitation experiments) were identical. The progress of the precipitation process was followed potentiometrically, and the obtained precipitates were characterized by infrared spectroscopy and scanning electron microscopy. The addition of Mg2+, in the entire investigated range of pH0 values, caused the inhibition of the spontaneous precipitation of CaCO3, as well as the change in the morphology and composition of the precipitates with a special emphasis on an increase in the mass fraction of aragonite in the precipitate. Also, the addition of Mg2+ caused inhibition of crystal growth of calcite on calcite crystal seeds as well as the promotion of aragonite formation at higher concentrations of added magnesium.
Keywords
Keywords (english)
Languagecroatian
URN:NBNurn:nbn:hr:182:830949
Study programmeTitle: Graduate University Study of Chemistry; research program; specializations in: Research program
Course: Research program
Study programme type: university
Study level: graduate
Academic / professional title: magistar/magistra kemije (magistar/magistra kemije)
Type of resourceText
File originBorn digital
Access conditionsOpen access
Terms of useLicence In copyright icon
Created on2023-03-29 07:35:04