Desorption of Cs+ ions from a vermiculite by exchanging with Mg2+ ions: effects of Cs+-capturing ligand

作者：Tamura Kenji^*; Sato Hisako; Yamagishi Akihiko

来源：Journal of Radioanalytical and Nuclear Chemistry, 2015, 303(3): 2205-2210.

DOI：10.1007/s10967-014-3744-3

• Cesium ions
• Vermiculite
• Ion-exchange
• Magnesium ions
• Tetra kis(4-fluorophenyl) borate sodium salt

Cs+ ions intercalated in a South African vermiculite were so firmly bound that they were hardly dissociated on treating with an aqueous solution of 1 M KNO3 or NH4NO3. When a vermiculite having adsorbed the saturated amount of Cs+ ions (0.61 mol g(-1)) was stirred in an aqueous solution containing 0.4 M of Mg(NO3)(2) and 20 mM of tetra kis(4-fluorophenyl)borate sodium salt (denoted as Na+L-), the intercalated Cs+ ions were fully replaced with Mg2+ ions within 2 h. The results were rationalized in terms of the ion-exchange reaction between Cs+ and Mg2+ ions: , in which the reverse reaction (or re-binding) of Cs+ ions was prohibited by the formation of an insoluble salt, Cs+L-.

• 出版日期2015-3