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Iron nanoparticles snatch uranium

To retrieve the radioactive loot, scientists just need a magnet

By
4:07pm, February 27, 2015

TAKING THE BAIT  In an iron (FE) nanoparticle (blue) with an iron hydroxide shell containing oxygen (O, green), uranium (U, red) first takes the bait created by the shell and then is trapped inside the solid iron core.

Using wee balls of iron, scientists can catch radioactive fuel — hook, line and sinker.

In liquid, iron nanoparticles quickly lure and encase uranium, which researchers can then reel in with a simple magnet. The method, reported online February 17 in the Journal of the American Chemical Society, could be used to sop up radioactive spills or to fish for fuel for nuclear power plants.

The tiny particles have a core of pure iron and a shell of iron hydroxide. Negative charges in the shell attract positive charges in a water-soluble form of uranium, in this case uranyl nitrate. Once baited by a nanoparticle’s outer shell, the uranium gets sucked into the middle of the sphere. There, the iron shackles uranium with extra electrons, locking it into the globe’s nanostructure. The whole process occurs within minutes.

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