| Affiliation: | (1) Key Laboratory of Geotechnical & Underground Engineering of Ministry of Education and Department of Geotechnical Engineering, Tongji University, 1239, Siping Road, Shanghai, 200092, People’s Republic of China;(2) School of Civil Engineering and Architecture, Changsha University of Science and Technology, 960 Section II, South Wanjiali Road, Changsha, 410114, People’s Republic of China;(3) Department of Chemistry, Tongji University, 1239, Siping Road, Shanghai, 200092, People’s Republic of China |
| Abstract: | Bentonite has been studied extensively because of its strong adsorption capacity. A local Na-bentonite named GMZ bentonite, collected from Gaomiaozi County (Inner Mongolia, China), was selected as the first choice of buffer/backfill material for the high-level radioactive waste repository in China. In this research, the adsorption of La (ΙΙΙ) onto GMZ bentonite was performed as a function of contact time, pH, solid content and metal ion concentrations by using the batch experiments. The results indicate that the adsorption of La (III) on GMZ bentonite achieves equilibration quickly and the kinetic adsorption follows the pseudo-second-order model; the adsorption of La (III) on the adsorbent is strongly dependent on pH and solid content, the adsorption process follows Langmuir isotherm. The equilibrium batch experiment data demonstrate that GMZ bentonite is effective adsorbent for the removal of La (III) from aqueous solution with the maximum adsorption capacity of 26.8 mg g−1 under the given experimental conditions. |
