Abstract
N,N,N′,N′-tetramethylmalonamide (TMMA) has been successfully grafted onto the chloroacetylated poly(styrene-co-divinylbenzene) resin to obtain a novel diamide-based resin (PS–TMMA). PS–TMMA exhibited high adsorption capacity and selectivity toward TcO4− in 0.1–1 M HCl. The adsorption process of PS–TMMA conforms (Revise: conformed) to Langmuir isotherm and pseudo-second-order kinetics model. The results of column experiments revealed TcO4− can be completely separated from the coexisting fission products (Sr(II), Eu(III), Dy(III), and 1 M NH3·H2O can re-collect TcO4− absorbed in the resin column. The adsorption mechanism of TcO4− is considered that PS–TMMA is converted into anion exchange resin in acidic condition.
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