Sorption behavior of Sr(II) in granitic rock: the effect of MX-80 bentonite colloids

MX-80 bentonite colloids' effect on radionuclide sorption was studied by batch method and transport in flow using a granitic drill core column and Sr(II) as a radionuclide. Batch-type sorption and desorption experiments were conducted to determine Sr(II)'s distribution coefficients on bentonite colloids and metatexitic gneiss. Molecular modeling assessed the radionuclide's sorption affinity and justified the differences in Sr(II)'s sorption behavior on biotite versus montmorillonite. The distribution coefficients were found to be a hundred times greater for colloids than for granitic rock. Strontium's breakthrough from the column with bentonite colloids was successful without notable retardation on rock minerals.

Automated summary

The effect of MX-80 bentonite colloids on radionuclide sorption was investigated using batch and flow transport methods. A granitic drill core column and Sr(II) as a radionuclide were employed. Batch-type sorption and desorption experiments were conducted to determine the distribution coefficients of Sr(II) on bentonite colloids and metatexitic gneiss. Molecular modeling was used to assess the sorption affinity of the radionuclide and explain the differences in Sr(II) sorption behavior on biotite and montmorillonite. The distribution coefficients for colloids were found to be a hundred times higher than for granitic rock. Strontium breakthrough from the column with bentonite colloids was successfully achieved without significant retardation on rock minerals.