Abstract
Due to low hydraulic conductivity, high swelling capacity, and good adsorption properties, the Gaomiaozi (GMZ) bentonite has been proposed as one of the most suitable buffer/backfill materials for the construction of engineering barriers in geological repository for high-level nuclear waste disposal in China. In this study, the adsorption of Sr(II) on the GMZ bentonite was studied using the batch technique, and the effects of contact time, pH, ionic strength, temperature, and concentration were analyzed. The results obtained from the tests show that the adsorption process achieved equilibrium within 60 min, and the adsorption capacity for Sr(II) by the GMZ bentonite was about 9.72 mg/g under the given experimental conditions. The equilibrium adsorption data were fitted to the second-order kinetic equation. The adsorption capacity for Sr(II) onto the GMZ bentonite increases with increasing pH from 3 to 13 but decreases with increasing ionic strength from 0 to 1.0-M NaCl. Maximum adsorption at a temperature of 298.15 K was determined to be achieved at pH ≥7. The adsorption reaction was exothermic, and the process of adsorption was favored at low temperature. The adsorption of Sr(II) was dominated by ion exchange. Furthermore, the D–R adsorption isotherm model was used for the description of the adsorption process.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
