Transformation of Structure and Adsorption Properties of Montmorillonite under Thermochemical Treatmentстатья
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Дата последнего поиска статьи во внешних источниках: 19 декабря 2019 г.
Аннотация:Complex studies revealed transformations of composition, structure, and properties of bentonite
clays of the Taganskoe (Kazakhstan) and Dahskovskoe (Moscow oblast) deposits under thermochemical treatment.
Leaching of cations from interlayer and octahedral sites, protonation of interlayer and OH-groups lead to
the modification of interlayer and 2 : 1 layer composition. This, in turn, causes significant changes of properties:
a decrease of cation exchange capacity owing to the decrease of layer charge and increase of specific surface
through the decomposition and partial amorphization of structure. Bentonites of the Dashkovskoe deposit
showed the higher resistance to the thermochemical impact than bentonites of the Taganskoe deposit owing to
the isolating action of organic matter. Obtained results demonstrated that bentonite clays preserve most of
adsorption properties even under such strong thermochemical influence (13М HNO3, 90°С, 5 h).