Abstract
SummaryThe sorption kinetics of neptunium on magnetite was investigated under both aerobic and anaerobic conditions in 0.1mol L-1NaNO3at pH=5.7 to 5.9. It was found that the sorption of neptunium on magnetite reaches an equilibrium in 1h under aerobic conditions, while it takes 10h or more to reach the equilibrium under anaerobic conditions. The difference in sorption kinetics between aerobic and anaerobic conditions took place because sorption kinetics under the anaerobic condition involved the reduction of Np(V) to Np(IV), confirmed by an extraction technique using 0.5mol L-1TTA in xylene and 2.0mol L-1HNO3solution. The reduction rate of Np(V) by Fe(II) in magnetite was calculated in solution with magnetite. It was found that Np(V) was reduced 1000 or more times faster in solution with magnetite than the Np(V) reduction by Fe(II) ions in homogeneous solution. It was revealed that the reduction of Np(V) in solution with magnetite took place on the surface of magnetite.
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