CHED 312 |
| Selective separation of cesium from other alkali metals under alkaline conditions is a challenging problem. The discovery of calixarene-crown ethers provided a new class of cesium-selective extractants that have shown to be the strongest and most selective extractants for cesium in the crown ether family. This investigation describes the properties of lipophilic calix[4]arene-benzocrown-6 ethers in the 1,3-alternate conformation functionalized with acidic pendant groups. The CAB6methyl compound contained –C(O)NHSO2CH3 as the pendant group and the CAB6phenyl compound contained –C(O)NHSO2Ph as the pendant group. The extraction of cesium from aqueous chloride solutions into toluene solutions of the above extractants was measured as functions of extractant concentration, chloride concentration, and pH over the range 2-13. The results indicate that the attached acidic pendent group reduces the ability of these compounds to interact strongly with cesium in acid solutions. Data from this study will be compared to other studies using nitrate as the counter ion to evaluate the anion effect on the extraction mechanism. |
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Undergraduate Research Poster Session: Analytical Chemistry
11:00 AM-1:00 PM, Monday, March 26, 2007 Hyatt Regency Chicago -- Riverside Center, Poster
Division of Chemical Education |