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How Biopolymers Control the Kinetics of Calcite Precipitation from Aqueous Solutionsстатья
- Авторы: Lakshtanov L.Z., Karaseva O.N., Okhrimenko D.V., Stipp S.L.S
- Сборник: Advances in Experimental and Genetic Mineralogy
- Серия: Special Publication to 50th Anniversary of DS Korzhinskii Institute of Experimental Mineralogy of the Russian Academy of Sciences. Litvin Yu.A. Safonov O.G (Editors)
- Том: 11
- Глава в коллективной монографии
- Год издания: 2020
- Издательство: Springer International Publishing
- Местоположение издательства: New York
- Первая страница: 223
- Последняя страница: 246
- DOI: 10.1007/978-3-030-42859-4_10
- Аннотация: This work is a continuation and extension of our studies of the kinetics of recrystallization and precipitation of calcite in the presence of biopolymers, as well as precipitation of calcite on the surface of biogenic calcite (chalk). Our results show that the dependence of calcite precipitation rate on supersaturation does not obey the parabolic law that is characteristic for calcite growth. Instead, the dependence was exponential, which indicates surface nucleation-mediated growth. Rate of calcite precipitation on chalk surfaces at the lowest supersaturation studied in this work is 3 orders of magnitude lower than on pure calcite surfaces. The presence of non-polar organic compounds, such as biomarkers, decreases surface energy but does not change the mechanism of calcite precipitation. On the contrary, the presence of adsorbed polysaccharides and polyamino acids on the surface determines the mechanism of calcite growth and precipitation. This is confirmed by the results of measuring ζ-potential as well as the induction period for homogeneous nucleation during CO2 degassing from solutions saturated at pCO2 = 1 atm with respect to calcite or various chalks.
- Добавил в систему: Лакштанов Леонид Зиновьевич