Functionalized nanomaterials for specific lanthanide separations and nuclear wastewater treatment

Awual, M. R.; Kobayashi, Toru ; Miyazaki, Yuji; Shiwaku, Hideaki   ; Suzuki, Shinichi; Okamoto, Yoshihiro  ; Yaita, Tsuyoshi

The O and N donor containing ligand was synthesized and then successfully immobilized onto mesoporous silica (hybrid materials) by a direct and building-block approach for lanthanide (Ln) separation. The coordination chemistry of Ln with O and N donor ligands has advanced because steric factors can be optimized with ligand set Ln contraction by choosing the best metal size from Ln. Also a new class macrocyclic ligand of AcDB20C6 was developed and DB24C8 and AcDB20C6 were directly immobilized onto mesoporous silica for Cs containing wastewater treatment. The AcDB20C6 has an ability to identify the Cs ion size based on cation and pai interaction. The pai electron of the benzene ring in AcDB20C6 and DB24C8 has high tendency to interact with d and f hybrid orbital electron of Cs. Moreover, the d and f hybrid orbital is absent in Na and K ions.