Cesium Sorption and Desorption on Glauconite, Bentonite, Zeolite, and Diatomiteстатья
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Дата последнего поиска статьи во внешних источниках: 8 января 2021 г.
Аннотация:This study is devoted to studying the sorption of 137Cs on mineral sorbents at a wide pH
range, from 2 to 10, as well as to studying sorption mechanisms. In order to obtain the most reliable
sorption characteristics, samples of high purity were examined as sorbents: bentonite, glauconite,
zeolite, and diatomite. A detailed description of their mineral composition, cation exchange capacity
and specific surface of sorbents is given. XRD, XRF, FTIR, SEM, and BET adsorption methods were
used for assaying. The sorption and desorption values were identified for each sorbent. As a result of
the conducted research, it can be concluded that 137Cs sorption mainly occurs through the exchange
reaction on zeolite, glauconite and bentonite. The highest cesium Kd was observed on zeolite due
to its high CEC and amounted to 4.05 mg/L at pH 7. The higher sorption capacity of glauconite in
comparison with bentonite is primarily due to the high layer charge which is mainly localized in
tetrahedral sheets, and to the existence of highly selective sorption sites (frayed edge sites) on the
glauconite surface. Diatomite showed the lowest sorption capacity provided by the presence of a
small quantity of smectite and kaolinite in its composition. The values of desorption increase in the
following order: zeolite < bentonite ~ diatomite < glauconite.