Synthesis and adsorptivity of acryloylmorpholine resin to various fission product elements in nitric acid media

Abstract

A novel silica-supported resin with a cyclic monoamide of polymerized 4-acryloylmorpholine (Silica-AM) was synthesized, and adsorptivity to metal ions of major fission products (FP) was examined in HNO 3 and HCl solutions. Silica-AM has a carbonyl oxygen atom outside of the 6-membered morpholine ring, and a cyclic structure that is different than other cyclic monoamide resins we have studied. These include polyvinylpolypyrrolidone (PVPP) and poly-N-vinyl-ε-caprolactam (VEC), both of which have coordinative carbonyl groups included in the ring. Silica-AM was similar to a cyclic monoamide we have reported because it exhibited adsorption to Pd(II) and Re(VII) in HNO 3 of a particularly low concentration range. Silica-AM has an ether oxygen atom included in the ring as well. Considering the difference in the chemical structures of Silica-AM and other cyclic monoamide resins, it was suggested that oxygen atoms in the carbonyl group and in ether may be main contributors to Silica-AM's respective adsorptions to Pd(II) and Re(VII), and Mo(VI) and Zr(IV). Our results imply that the contribution of the two types of oxygen atoms to adsorption is more observable in an HCl system. The contribution of the ether oxygen atom to the adsorption of Pd(II) was also suggested from our study on crystal prepared from 4-acetylmorpholine and palladium nitrate. monoamide resin, acryloylmorpholine, FP, nitric acid