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Studium procesu elektrofotokatalytické dezinfekce vody
Cisáriková, Barbora ; Zita, Jiří (oponent) ; Veselá, Mária (vedoucí práce)
Táto bakalárska práca bola zameraná na fotokatalytickú dezinfekciu vody pomocou oxidu titaničitého aplikovaného na pracovnú elektródu. Experiment prebiehal za normálnych podmienok, s aplikáciou UV-žiarenia s intenzitou 40 W/m2 a s UV-žiarením a elektrickým napätím 1 V súčasne. Každá časť experimentu prebiehala po dobu 60 a 120 minút. Mikrobiocídny účinok bol sledovaný na baktérii Escherichia coli.
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Preparation and characterization of biodegradable composites based on polyhydroxyalkanoates and coffee grounds
Cisáriková, Barbora ; Němcová, Andrea (oponent) ; Kovalčík, Adriána (vedoucí práce)
This diploma thesis was focused on the preparation and characterization of biodegradable composites based on poly-3-hydroxybutyrate (PHB) and spent coffee grounds (SCG). The aim was to prepare biocomposites based on PHB and coffee grounds. Biocomposites were prepared by solution casting in chloroform. Films with a thickness of about 150-200 µm were prepared with the addition of 20% unmodified and modified coffee grounds. The PHB/SCG films were modified by an addition of a plasticizer and a crosslinking agent or by blending with polybutylene adipate terephthalate (PBAT). The thermal properties of the films were determined by differential scanning calorimetry. The compatibility filler/polymer matrix compatibility was assessed morphologically with the naked eye. It has been found that the direct addition of spent coffee grounds to the PHB is not suitable due to the deterioration of the morphology of the film surfaces and the formation of aggregates. The compatibility between the spent coffee grounds and the PHB was improved after the addition of the plasticizer and the crosslinking agent. However, the highest compatibility between SCG and PHB was achieved in the case of esterified coffee grounds. Another way to improve the resulting morphological properties of the films thus prepared was to use coffee grounds fractions.
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Preparation and characterization of biodegradable composites based on polyhydroxyalkanoates and coffee grounds
Cisáriková, Barbora ; Němcová, Andrea (oponent) ; Kovalčík, Adriána (vedoucí práce)
This diploma thesis was focused on the preparation and characterization of biodegradable composites based on poly-3-hydroxybutyrate (PHB) and spent coffee grounds (SCG). The aim was to prepare biocomposites based on PHB and coffee grounds. Biocomposites were prepared by solution casting in chloroform. Films with a thickness of about 150-200 µm were prepared with the addition of 20% unmodified and modified coffee grounds. The PHB/SCG films were modified by an addition of a plasticizer and a crosslinking agent or by blending with polybutylene adipate terephthalate (PBAT). The thermal properties of the films were determined by differential scanning calorimetry. The compatibility filler/polymer matrix compatibility was assessed morphologically with the naked eye. It has been found that the direct addition of spent coffee grounds to the PHB is not suitable due to the deterioration of the morphology of the film surfaces and the formation of aggregates. The compatibility between the spent coffee grounds and the PHB was improved after the addition of the plasticizer and the crosslinking agent. However, the highest compatibility between SCG and PHB was achieved in the case of esterified coffee grounds. Another way to improve the resulting morphological properties of the films thus prepared was to use coffee grounds fractions.
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Studium procesu elektrofotokatalytické dezinfekce vody
Cisáriková, Barbora ; Zita, Jiří (oponent) ; Veselá, Mária (vedoucí práce)
Táto bakalárska práca bola zameraná na fotokatalytickú dezinfekciu vody pomocou oxidu titaničitého aplikovaného na pracovnú elektródu. Experiment prebiehal za normálnych podmienok, s aplikáciou UV-žiarenia s intenzitou 40 W/m2 a s UV-žiarením a elektrickým napätím 1 V súčasne. Každá časť experimentu prebiehala po dobu 60 a 120 minút. Mikrobiocídny účinok bol sledovaný na baktérii Escherichia coli.
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