Abstract
Sorption of fission products onto polycondensed aluminosilicates (PC-AS(s)) is a relatively recent and gets out the mechanisms by which the formers are trapped. Here, PC feldspar (PC-FD), perlite (PC-PR) and their blend (PCFDPR) were synthesized by the alkaline activation using Na-/K-silicates at Si-modulus of 1.35. XRD patterns revealed the semi-crystalline natures of sorbents. Naand K-feldspars were detected in PC-FD while Na-based carbonate crystals were detected in others. Components of the poly(sialate-disiloxo) structure were detected in FT-IR spectra. Thermographs were deconvoluted and the amounts of the sticking and zeolitic water were estimated. Kinetic batches for sorption of Cs-134 and Eu152+154 onto the elaborated yields were constructed. Ranking of sorbed amounts (q(e)) was varied from Cs-134 (PC-FDPR>PC-FD>PC-PR) to Eu152+154 (PC-PR>PCFD>PC-FDPR). Maximum q(e) was recorded at elevated temperature (323 K) to be 4.28 and 1.45 mg/g for Cs-134/ PC-FDPR and Eu152+154/PC-PR, respectively. Along all batches, chemi-sorption mechanism is common denominator. The effective diffusion coefficients (D-i) were in the order of 10(-14) m(2)/s. Both PC-FD and PC-FDPR recorded greater D-i values of Cs-134 than Eu152+154. The low values of E-a (kJ/mol) reflected the weak adsorbats-adsorbents interactions. While, the high negative values of Delta S double dagger suggested that the studied radionuclides were sorbed in associative reaction mechanism