Author, Institution: Inga Gedeikė, Kaunas University of Technology
Science area, field of science: Technological Sciences, Chemical Engineering, T005
Scientific Supervisor: Prof. Dr. Kęstutis Baltakys (Kaunas University of Technology, Technological Sciences, Chemical Engineering, T005)
Dissertation Defense Board of Chemical Engineering Science Field:
Prof. Dr. Eugenijus Valatka (Kaunas University of Technology, Technological Sciences, Chemical Engineering, T005) – chairperson
Assoc. Prof. Dr. Joana Bendoraitienė (Kaunas University of Technology, Technological Sciences, Chemical Engineering, T005)
Prof. Dr. Rimvydas Kaminskas (Kaunas University of Technology, Technological Sciences, Chemical Engineering, T005)
Prof. Dr. Jūratė Kumpienė (Lulea University of Technology, Sweden, Technological Sciences, Materials Engineering, T008)
Prof. Dr. Ramūnas Skaudžius (Vilnius University, Natural Sciences, Chemistry, N003)
Dissertation defense meeting will be at Rectorate Hall of Kaunas University of Technology (K. Donelaičio 73 – 402, Kaunas)
The doctoral dissertation and summary of doctoral dissertation are available at the library of Kaunas University of Technology (Gedimino 50, Kaunas) and on the internet: I. Gedeikė el. dissertation (PDF)
Annotation: In this work, the synthesis conditions, chemical and physical properties of samples of calcium silicate hydrates (CaO/SiO2 = 1.5) modified with Cu2+, Co2+ or Cr3+ ions were investigated for their formation in a hydrothermal environment and their applicability in heavy metal ion adsorption processes was determined. In a temperature of 150°C in the 1,5CaO-SiO2∙nH2O-mH2O system, the starting materials reacted hard during hydrothermal synthesis, even after 72 h of isothermal curing. When the temperature was increased to 200°C, the starting materials started to react after a minimum residence time (1h) and calcium silicate hydrates were formed in different molar ratios depending on the heavy metal additive. During hydrothermal synthesis (200°C, 1h), it was found that all Cr3+ ions were intercalated into the calcium silicate hydrates structure, whereas Co2+ and Cu2+ ions formed separate compounds. Calcium silicate hydrates substituted with Cr3+ ions were thermally stable up to a temperature of 280°C, as the structure of the compounds formed by hydrothermal synthesis started to decompose in a higher temperature environment. The untreated samples of calcium silicate hydrates substituted with Cr3+ ions were suitable adsorbents for the adsorption of heavy metal ions and 194, 422 or 640 mg Cr3+, Co2+ or Cu2+/g can be removed from the aqueous medium by two processes (hydrothermal synthesis and adsorption).
September 6 d. 10:00
Rectorate Hall at Kaunas University of Technology (K. Donelaičio 73-402, Kaunas)
Įtraukti į iCal
