Abstract
A novel impregnated resin with n-octyl diphenyl phosphate (ODP-IR) was developed for the separation of thorium from leaching solution of rare earth (RE) waste residue. Nitrogen adsorption, FT-IR spectra, scanning electron microscopy and energy dispersive spectrometer were conducted for the characterization of ODP-IR. Uptake of ODP-IR for Th4+ was significantly affected by changing HNO3 concentration. The adsorption data were fitted well with pseudo-second-order rate model. Thermodynamic parameters for the adsorption of Th4+ were calculated and discussed. The adsorption was fitted well with the Langmuir isotherm model than Freundlich isotherm model. ODP-IR was repeatedly used five times without obvious loss for Th4+ adsorption, indicating that the adsorbent was stabilized. The ODP-IR was successfully used to separate Th from RE and Fe using the feed solution from ion-adsorption type RE waste residue, which revealed potentials in the fields of RE resource utilization, radioactive contamination treatment and nuclear fuel preparation.
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