K. Almonaitytė “Preparation of cationic starch derivatives and their application in water treatment” doctoral dissertation defense

Thesis Defense

Author, Institution: Karolina Almonaitytė, Kaunas University of Technology

Science area, field of science: Technological Sciences, Chemical Engineering, T005

Scientific Supervisor: Assoc. Prof. Dr. Joana Bendoraitienė (Kaunas University of Technology, Technological Sciences, Chemical Engineering, T005)

Dissertation Defense Board of Chemical Engineering Science Field:
Prof. Hab. Dr. Juozas Vidas Gražulevičius (Kaunas University of Technology, Technological Sciences, Chemical Engineering, T005) – chairperson
Prof. Dr. Kęstutis Baltakys (Kaunas University of Technology, Technological Sciences, Chemical Engineering, T005)
Prof. Dr. Jolita Ostrauskaitė (Kaunas University of Technology, Technological Sciences, Chemical Engineering, T005)
Dr. Egidija Rainosalo (Centria University of Applied Sciences, Finland, Technological Sciences, Chemical Engineering, T005)
Prof. Dr. Jūratė Šiugždaitė (Lithuanian University of Health Sciences, Medical and Health Science, Medicine, M001)

The Dissertation defense meeting was at Rectorate Hall at Kaunas University of Technology (K. Donelaičio g. 73-402, Kaunas)

The doctoral dissertation is available at the library of Kaunas University of Technology (K. Donelaičio g. 20, Kaunas)

Annotation: As the pollution of water increases, more attention is paid to ecology, and environmental requirements are becoming stricter. For more than half a century, polysaccharides such as starch have been increasingly used in water treatment. Starch is one of the most common natural polysaccharides; it is abundant in various agricultural waste, so it could be used in the non-food industry to produce added-value products. In this dissertation, the degree of crosslinking of modified starch obtained from various plants was evaluated by different methods. This gives more knowledge to use starch from various plants in the production of sorbents. Such derivatives can be applied in the adsorption of pharmaceutical active compound – ibuprofen. In this work, for the first time, cross-linked cationic starch was applied for ibuprofen adsorption, and its sorption capacity exceeds 550 mg/g. More information is provided on the morphological and chemical properties of cationic starch, the synthesis of which uses compounds containing Ca2+ ions. Due to the addition of Ca2+ ions, the efficiency of the cationic starch etherification reaction increases up to 100%, soluble and biodegradable cationic starch was obtained, and the duration of etherification reaction shortened by half. Starch derivatives were used in coagulation/flocculation processes to thicken sewage sludge and separate microalgae. A technology for the production of soluble and biodegradable cationic starch coagulant/flocculant was proposed. The most effective starch derivatives with a degree of substitution of 0.25 ± 0.03 can partially replace synthetic flocculants in water treatment.

December 21 d. 14:00

Rectorate Hall at Kaunas University of Technology (K. Donelaičio g. 73-402, Kaunas)

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