The main objective of this study was to investigate removal effciency of uranium in the synergistic effect of oxygen and iron(II) with different initial Fe(II) concentration, and study the change of pH, Eh and iron ion species and concentration in solution over time. The result revealed that there is no inevitable correlation between the decreases of U(VI) concentration and initial concentration of Fe(II), and the removal rate are up to 93%; When the initial concentration of Fe(II) was 5mg/L, 10mg/L, 25mg/L, 50mg/L and 100mg/L,the rem...