Evaluation of Safety Treatment of Radiation Waste Solutions Using Nano-Composite

Abstract

In this work, GA/PAAm hydrogel and its nanocomposites were synthesized by gamma irradiation and applied to treatment of Cs+ and Co2+ ions from aqueous solution throughout sorption technique. Furthermore, freshly graphene was obtained and used as nanoparticles in GA/PAAm hydrogel to form GA/PAAm/GR nanocomposite. Also, different nanocomposite are prepared (GA/PAAm)-MNC, (GA/PAAm/GR)-MNC, GA/PAAm/SiO2, and (GA/PAAm/SiO2)-MNC to use as sorbents of Cs+ and Co2+ ions. The investigated systems were characterized using, Ramman spectroscopy, FTIR, TGA, FESEM, HRTEM, XRD, EDX, magnetization properties and mechanical properties by nanoindentation. Swelling capacity of the prepared hydrogel and nanocomposites were evaluated as a function of time, gamma radiation doses, monomer compositions, initial feed concentration, and pH of medium. Comparing the efficiency of treatment of Cs+ and Co2+ ions using the GA/PAAm hydrogel, (GA/PAAm)-MNC, GA/PAAm/GR, (GA/PAAm/GR)-MNC, GA/PAAm/SiO2, and (GA/PAAm/SiO2)-MNC nanocomposite were investigated. The factors controlling the adsorption process such as pH, contact time, initial metal ion concentration, adsorbent dose, competing ions, temperature and desorption were studied to know the most suitable condition for adsorption. From the obtained results the following conclusions can be derived: