In order to develop a simple separation process by extraction chromatography of trivalent minor actinides (MA) and lanthanides (Ln), a novel macroporous silica-based R-BTP (BTP: 2,6–bis–(5,6–dialkyl–1,2,4–triazine–3–yl)–pyridine, R:
isohexyl) extraction resin was synthesized by impregnating the R-BTP extractant into the pores of SiO
2-P support particles. The adsorption property of simulated fission products including Ln was investigated with HNO
3 solution onto the R-BTP extraction resin. It was found that Dy(III), probably similar adsorbability to MA (III), was dominantly adsorbed onto the resin in 2-4 M HNO
3 solution at 50℃, compared with the other Ln (III). In addition, the chemical stability and thermal decomposition property of the resin were evaluated and the resin was resistant to HNO
3 solution at ambient temperature.
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