Thursday, 3 November 2005 - 8:03 AM
461a

Barrier Films for Cesium or Carbon Tetrachloride

Andy Warta1, Tsutomu Shimotori2, William A. Arnold2, and Edward L. Cussler Jr.1. (1) Chemical Engineering and Materials Science, University of Minnesota, 421 Washington Ave SE, 151 Amundson Hall, Minneapolis, MN 55455, (2) Civil Engineering, University of Minnesota, 500 Pillsbury Dr S ERoom 122 CivE, Room 122 CivE, Minneapolis, MN 55455

We have built barriers for cesium ion and for carbon tetrachloride which can retard leaks out of landfills by over three hundred times. The barriers for cesium ion contain 50 µm particles of crystalline silicon titanate (CST) which selectively adsorb the cesium. The barriers for carbon tetrachloride contain 20 nm iron particles melt blended into polyethylene. The particles react with diffusing CCl4. In both cases, the barriers eventually do leak at close to the normal rate once the CST or the iron is consumed. The results support theories which predict the effect of other reactive barriers.

See more of #461 - Functionalized Membranes: Synthesis and Applications (02D20)
See more of Separations Division

See more of The 2005 Annual Meeting (Cincinnati, OH)