Abstract
In this research, the MnO2NPs-AgX zeolite as a novel composite adsorbent was synthesized and identified via Scanning electron microscopy (SEM), Atomic adsorption spectrometry (AAS), X-ray diffraction (XRD) and Fourier transform infrared (FTIR) techniques. Furthermore, the removal of radioactive strontium-90 (90Sr) from drinking tap water of Ramsar city was investigated via the synthesized MnO2NPs-AgX zeolite composite. A single radiometric technique, Ultra Low-Level Liquid Scintillation Counting (LSC), was also exerted to monitor the reaction progress. The obtained results revealed that the 90Sr was perfectly removed after 8 h by the MnO2NPs-AgX zeolite composite. Also, the reaction kinetic information was studied applying pseudo first and second order kinetic Elovich and Intra particle diffusion kinetic models. The adsorption kinetics of 90Sr was matched appropriately to the pseudo second order kinetic model. Further, the evaluation of the thermodynamic parameters such as ΔG0, ΔH0 and ΔS0, specified that the adsorption procedure of 90Sr was spontaneous and illustrates physical adsorption properties and exothermic nature of the adsorption. It is emphasized that the MnO2NPs-AgX zeolite as a novel composite represents a high capacity and potential for the removal of radioactive 90Sr from drinking water samples.
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