Background: The fluoride volatility process has been developed to recover uranium from spent nuclear fuel. And the fluoride adsorption and desorption technique is usually applied to the purification of UF6 in the fluoride volatility process. Purpose: This study aims to investigate the adsorption mechanism of MoF6 on NaF adsorbent. Methods: The adsorption equilibrium and kinetics of MoF6 on NaF adsorbent at different temperatures and initial MoF6 pressure were experimentally studied by using statistic adsorption equipment. Langmuir adsorption model and adsorption kinetics model were applied to analyse experimental data. Results: The adsorption rate and equilibrium adsorption capacity of MoF6 on NaF adsorbent increased with the temperature increasing from 50 oC to 100 oC

and the adsorption capacity was 115 mg MoF6?g?1 NaF at 100 oC.The experimental data were fitted by pseudo-second-order kinetics as well as Langmuir adsorption model. Conclusion: The adsorption of MoF6 on NaF adsorbent was monolayer adsorption according to Langmuir adsorption model

and was controlled by diffusion of MoF6 inside NaF adsorbent which was not the unique rate-determining step

though. Abstract