Evaluation of component additive modelling approach for europium adsorption on 2:1 clays: Experimental, thermodynamic databases, and models.

摘要: This study evaluates the component additive approach for Eu adsorption on mixtures of smectite and illite, which are most common clays used as barriers contaminant retention in waste repositories. A thorough set data Na-exchanged illite that encompasses a wide range pH values, ionic strengths, concentrations was provided. database is likely one largest sorption databases available 2:1 clays, making it appropriate model calibration. The main mechanisms considered were surface complexation, weak strong clay edge sites, cation exchange. Further, role principal ions, naturally leached from competitive factors retention, evaluated modelling calculations. uncertainties related to procedures use different thermodynamic outlined. reactions parameters successful individual without any modification illite/smectite mixtures, wherein only relative mineral proportions considered. fit mixed system satisfactory, indicating that, an process, stresses predictive capacity these systems. important support assessing performance barrier materials migration under geochemical conditions.