Batch Adsorption and Desorption Investigations of Cs(Ⅰ)and Sr(Ⅱ)from Simulated Reactor Waste by Humic Acid
This work focused on cost-effective and collective adsorption of radionuclides followed by their sub-sequent selective desorption,which is necessary for separation.The potential of humic acid,a low-cost adsorbent,for the removal and recovery of Cs(Ⅰ)and Sr(Ⅱ)from simulated reactor waste,was investigated.Experimental parameters like solution pH,adsorbent dose,contact time and temperature were optimized.FT-IR of humic acid before and after adsorption was compared.Selective desorption of both the radionuclides was achieved with desorbing agents-citric acid and HCl.The process was governed by rapid kinetics where 91±2%of Cs(Ⅰ)and 83±2%of Sr(Ⅱ)was adsorbed within 10 min.Data modelling revealed that the process follows pseudo-second-order kinetics,and is spontaneous,feasible and exothermic,with positive entropy indicating a high affinity of humic acid for the metallic ions.Maximum desorption of 97±2%was obtained for Sr(Ⅱ),and 82±2%for Cs(Ⅰ).Thus,the adsorption of investigated radionuclides by humic acid and their desorption was time-efficient,economical and environmentally a benign alternative for the removal and recovery of Cs(Ⅰ)and Sr(Ⅱ).
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