Evaluation of Me-2-CA-BTP/SiO2-P adsorbent for the separation of minor actinides from simulated HLLW

摘要

A novel silica-based adsorbent Me-2-CA-BTP/SiO2-P was prepared to separate minor actinides from fission products in high level liquid waste. Me-2-CA-BTP/SiO2-P adsorption behavior towards Am-241(III) and main FP from HNO3 solutions were studied. The adsorbent exhibited much higher affinity for Am(III) over FP elements in a large HNO3 concentration range and possess good adaptability as HNO3 concentration changes. Dy(III), as a simulated element of MA(III), showed good adsorption properties and elution performance. Dy(III) adsorption kinetics and isotherm followed the pseudo-second-order rate law and Langmuir isotherm adsorption model, respectively. Adsorbed Dy(III) could be effectively eluted from Me-2-CA-BTP/SiO2-P by H2O or dilute HNO3.