Minor Actinides Partitioning: Uptake of Palladium with Triazine-Containing Adsorbent under the Framework of SPMP Process

Abstract

To remove Pd(II), a new triazine-containing silica adsorbent, BisDiOTP@SiO2–P, was prepared. The synthesis was achieved by impregnation in situ and immobilization of a multinitrogen ligand, BisDiOTP, into the pores of the SiO2–P support. The uptake of typical metals Sr(II), Pd(II), Li(I), Na(I), Cs(I), K(I), Rb(I), and Ba(II) onto BisDiOTP@SiO2–P was investigated. The effects of contact time and HNO3 concentration from 0.4 to 5.0 M were studied. The strong uptake ability and selectivity of BisDiOTP@SiO2–P for Pd(II) was indicated by six cycles of the batch uptake and desorption. The removal efficiency was always more than 99.2% for Pd(II) and less than 0.15% for others. In light of the results of batch experiments, the removal of Pd(II) from a simulated 1.0 M HNO3 was performed using BisDiOTP@SiO2–P as a stationary phase by extraction chromatography. Pd(II) adsorbed by BisDiOTP@SiO2–P was effectively desorbed with 0.2 M thiourea. An efficient removal of Pd(II) by BisDiOTP@SiO2–P was achieved. Some valuabl...