Use of silicotitanates for removing cesium and strontium from defense waste
| Autor: | Robert G. Dosch, Rayford G. Anthony, Ding Gu, C. V. Philip |
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| Rok vydání: | 1994 |
| Předmět: | |
| Zdroj: | Industrial & Engineering Chemistry Research. 33:2702-2705 |
| ISSN: | 1520-5045 0888-5885 |
| DOI: | 10.1021/ie00035a020 |
| Popis: | A new hydrous crystalline silicotitanate (CST), which the authors call TAM-5, has been synthesized that selectively removes cesium cations from solutions containing up to 5.7 M Na[sup +] and for a pH range of less than 1 to greater than 14. In basic media and at the high concentrations of Na[sup +] the CST also removes strontium cations from the solution. For a solution containing 5.7 M Na[sup +], 0.6 M OH[sup [minus]], 5.1 M NO[sub 3][sup [minus]], 100 mg/l Cs[sup +], and 20 mg/l Sr[sup 2+], the distribution coefficients for cesium and strontium are 1,000 ml/g and greater than 4,000 ml/g, respectively. For a solution of 5.7 M NaNO[sub 3], 100 mg/l Cs[sup +] and 20 mg/l Sr[sup 2+] the distribution coefficient for cesium is greater than 10,000 ml/g and for strontium it is equal to 200 ml/g. Experimental studies have also been conducted using complex waste simulants, which compare the performance of this CST and up to 60 other potential ion exchangers/absorbents. These studies substantiate the high selectivity of the CST for cesium in acidic and basic solutions. This new CST, labeled TAM-5, has considerable potential for removing cesium and strontium from defense wastes. |
| Databáze: | OpenAIRE |
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