Sorption behavior of Se(IV) species on kaolinite

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Title: Sorption behavior of Se(IV) species on kaolinite
Author: Viitala, Jani
Contributor: University of Helsinki, Faculty of Science
Publisher: Helsingin yliopisto
Date: 2020
Language: eng
Thesis level: master's thesis
Degree program: Kemian ja molekyylitieteiden maisteriohjelma
Master's Programme in Chemistry and Molecular Sciences
Magisterprogrammet i kemi och molekylära vetenskaper
Specialisation: ei opintosuuntaa
no specialization
ingen studieinriktning
Discipline: none
Abstract: Long term nuclear waste disposal has arisen as an important field of study due to the increasing amounts of generated nuclear waste. A suggested approach to long term disposal is geological waste deposits. Selenium-79 is a relevant radionuclide in nuclear waste because it has a long half-life and its species can be very mobile. Sorption modeling is a way of studying the sorption behavior in a very detailed manner. This study focused on sorption behavior of selenium on kaolinite, which is a prevalent clay mineral. Sorption was studied with batch sorption experiments, which yielded distribution coefficients and a sorption isotherm that details low sorption of selenium on the surface of kaolinite. Mineral characterization of kaolinite along with titration experiments resulted in promising sorption data, that could be further used for sorption modeling in the future.
Subject: selenium
geological repository

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