Abstract
Abstract Using batch and column procedures, the present work investigated the sorption behaviour of 137Cs and 152+154Eu by bentonite phosphate modified with nickel (BPN) sorbent. The kinetic data obey pseudo-1st-order for 137Cs and follow pseudo-2nd-order for 152+154Eu. Various sorption isotherm models were used to analyze equilibrium data. The thermodynamic functions reflect an endothermic and spontaneous sorption process. HCl (about 95.35 %) and CaCl2 (about 98.13 %) showed the optimum eluents for the complete recovery of both 137Cs and 152+154Eu, respectively. Finally, column data show that 137Cs and 152+154Eu may be loaded on BNP sorbent and separated from an aqueous solution using a variety of HCl concentrations as eluent. The obtianed results revealed that BNP sorbent is suitable for recovering 137Cs and 152+154Eu from low-level radioactive waste effluents (LLW).
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