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  • Chem Sci Trans., 2019, 8(2),  pp 180-194  

    DOI:10.7598/cst2019.1565

    Research Article

    152/154Eu(III) Ions Sorption on Stannic Silicate Granules: A Radiotracer Study

  • I. M. ALI*, H. A. MADBOULY and M. M. EL-SHORBAGY
  • Hot Labs Centre, Atomic Energy Authority, P.C. 13759, Cairo, Egypt
  • Abstract

    Silicates and related porous materials are solids able to interact with guest molecules, ions and atoms not only at their surfaces but also within the bulk. With the objective of producing materials showing better sorption properties, a laboratory prepared stannic silicate in mixed SnO2@SiO2 form was investigated as potential sorbent for retention of long lived radionuclides 152+154Eu3+ from aqueous solution containing 134Cs+ and 60Co2+. Sorption of Eu3+ has been reported as a function of contact time, initial ion concentration and temperatureat a constant pH equal to 4. The uptake of Eu3+ was found to be favored at high ion concentration, high temperature and no significant sorption took place after the first 4 h. A pseudo second order kinetic pattern fitted the sorption data well, while equilibrium was positively verified with Freundlich-type equation. Further, in attempt to enhance the separation efficiency of the studied radionuclides from aqueous medium, results showed that the sorption on SnSi was found strongly temperature?dependent. Ions equilibrium was found exothermic in case of 134Cs+ however it endothermic in case of both 60Co and 134Cs ions. Based on this contradict uptake, selectivity of ions has been estimated and separation of Eu3+ from other competing ions was achieved.The thermodynamic parameters (ΔG, ΔH and ΔS) showed that the adsorption process is spontaneous and exothermic in case of 134Cs+ but it endothermic in case of the later studied ions.

    Keywords

    Stannic silicate, Radiotracer, Removal, Kinetic studies, Sorption isotherm

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