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Poly(amidoamine) dendrimer functionalized carbon nanotube was demonstrated as highly efficient sorbent of the Pu 4+  from radioactive waste solution. The second generation dendrimer was found to have more efficiency as compared to the 1 st  generation might be due to the availability of more functionality for coordinating to the Pu 4+  ion. Analysis of different isotherm models revealed that, Langmuir isotherm was predominantly operating through chemi-sorption (with the sorption energy 10.07 and 16.95 kJ mol −1  for 1 st  and 2 nd  generation dendrimer) with the sorption capacity 89.22 mg g −1  and 92.48 mg g −1  for 1 st  and 2 nd  generation dendrimer, respectively. Analysis of different sorption kinetics model revealed that the sorption proceeded via pseudo 2 nd  order reaction. The 2 nd  generation dendrimer was found to be radiolytically more stable while oxalic acid was found to be suitable for quantitative back extraction of Pu 4+ .

radiochimica acta

Understanding the sorption behavior of Pu 4+  on poly(amidoamine) dendrimer functionalized carbon nanotube: sorption equilibrium, mechanism, kinetics, radiolytic stability, and back-extraction studies