Diploma Thesis Defense by Mrs. Dimitra Fasouletou
09/19/2019
Thesis Title: « INTERACTION OF TITANIUM DIOXIDE NANOPARTICLE WITH KAOLIN »
Wednesday 12 February 2020, at: 14:00, Venue: Hall Κ2.Α11
Examination Committee
- Professor Constantinos Chrysikopoulos (advisor)
- Professor George Karatzas
- Professor Ioannis Tsanis
Abstract
Titanium dioxide is one of the most popular nanoparticles as it is widely used in products such as cosmetics, sunscreen, colour, coatings, photocatalysts and environmental catalyst (Mueller and Nowack, 2010). The ever-increasing use makes it unavoidable to enter in the natural environment, and subsequently transport to underground formations. Clays a form of organic colloids are the most abundant colloids in natural aquatic systems. Since they contain surface charge heterogeneity, the clay particles have been found to have a high potential for interaction with other bio-colloids and could serve as colloidal carriers, affecting their distribution in the natural environment (Schroth et al., 1997; Zhao et al., 1991; Vasiliadou et al., 2011; Syngouna et al., 2013). It is therefore worthwhile to study the interaction of titanium dioxide with aluminate in order to determine whether and under what conditions the behavior and adsorption of titanium dioxide nanoparticles on the porous medium can be affected. To study the interaction of TiO2 nanoparticles with kaolinite colloids (KGa-1b), static and dynamic batch experiments were initially performed. In the dynamic experiments, quartz sand was used as porous medium. In detail, batch experiments with different concentrations (50, 100, 200 mg/L) and different ionic strength values (1, 25, 50,100 mM) were performed and the corresponding kinetic data were calculated for each experiment. Subsequently, flow experiments were performed on a saturated column of water, filled with quartz sand in order to de
