A modular process for the treatment of high level liquid waste (HLLW) using solvent-impregnated graphene aerogel

Graphene aerogel (GA) is a kind of superhydrophobic material with low density, high specific surface area and porosity. It can be used as modular matrix material to be impregnated with extractant due to its excellent organic solvent immobilization performance. In this paper, the modular GA based solvent impregnated adsorbents (GA-SIA) with various extractants were prepared. The adsorption performance of these adsorbents for typical fission products in high level liquid waste (HLLW) was investigated, and it is found that the adsorption performance is strongly dependent on the impregnated extractants. Based on the batch adsorption experiments, a modular process for the treatment of HLLW was proposed and tested. The results demonstrate that the modular process based GA-SIA possesses advantages of high selectivity, simple operation and low cost.