Sorption of Np(V) onto hybrid clay-based materials: Montmorillonite-melanoidin

Abstract

The sorption of Np(V) onto hybrid clay-based materials (HCMs) prepared from montmorillonite in the Maillard reaction was studied at environmentally relevant concentrations. Above pH 7, the sorption of Np(V) on HCM is weaker than that on the pure montmorillonite, with a reversed trend observed at lower pH values. With increasing pH, increasing amounts of melanoidins are released into the aqueous phase, thus the complexation of Np(V) in the aqueous phase was studied as well. The complexation in the aqueous phase is obviously increasing the mobility of Np(V). The sorption of Np(V) on the HCM is compared to the prediction by the linear additive model.