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To separate the long-lived minor actinides (MA = Am, Cm) from high level liquid waste (HLLW), we have been studying a partitioning technology named “MAREC” (Minor Actinides Recovery from HLLW by Extraction Chromatography) process which consists of two separation columns packed with silica-based adsorbents. In this work, we prepared the silica-based 2,6-bis(5,6-di iso hexyl-1,2,4-triazin-3-yl)pyridine ( iso hexyl-BTP/SiO 2 -P) adsorbent used in the second column (0.01 ∼ 0.1 mol dm  – 3  HNO 3 ) in the MAREC process for the separation of trivalent minor actinides (MA(III)) from trivalent rare earth elements (RE(III)) which are contained in HLLW. The content of extracting agent  iso hexyl-BTP in  iso hexyl-BTP/SiO 2 -P was as high as 33.3% of the total mass of the adsorbent. The adsorbent exhibited high affinity and selectivity for Am(III) over RE(III) not only in nitric acid solution but also in nitrate solution. Investigation showed that only a small part of  iso hexyl-BTP molecules inside  iso hexyl-BTP/SiO 2 -P leaked into 0.01 mol dm  – 3  HNO 3  with or without  γ -irradiation. The adsorption performance of  iso hexyl-BTP/SiO 2 -P did not evidently change after 120 d of contact with 0.01 mol dm  – 3  nitric acid. Furthermore, after  γ -irradiated in 0.01 mol dm  – 3  HNO 3  under the experimental conditions,  iso hexyl-BTP/SiO 2 -P exhibited higher adsorption for RE(III) than before  γ -irradiation.

Evaluation study on a macroporous silica-based iso hexyl-BTP adsorbent for minor actinides separation from nitric acid medium