Adsorption and retardation of Sr2+ by four clays were investigated, which were evaluated by using the distribution coefficient (KD) and average penetration length ratio of Sr2+ to water (r). KD values for Sr2+ among the four clay minerals were in the order: kaolinite < illite < vermiculite ≪ allophane, and Sr2+ penetration length ratio (r) followed the inverse order. Adsorption was further analyzed by using Langmuir adsorption model for competitive Sr2+ and Na+ adsorption at constant NaCl concentration. Conditional affinity constants suggested that Sr2+ adsorption on the variable charge sites of clay edges contributed to the high conditional Sr2+ affinities.
- Clay minerals
- Competitive adsorption
- Distribution coefficient
- Penetration length ratio
Ning, Z., Ishiguro, M., Koopal, L. K., Sato, T., & Kashiwagi, J. (2018). Comparison of strontium retardation for kaolinite, illite, vermiculite and allophane. Journal of Radioanalytical and Nuclear Chemistry, 317(1), 409-419. https://doi.org/10.1007/s10967-018-5870-9