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Resorcinol - formaldehyde adsorption of cesium from Hanford waste solutions, Part I. Batch equilibrium study

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Abstract

Batch equilibrium measurements were conducted at 25±2 °C with a granular resorcinol-formaldehyde (RF) resin to determine the distribution coefficients (K d for cesium. In the tests, Hanford Site actual waste sample containing radioactive cesium (137Cs) and a pretreated waste sample that was spiked with non-radioactive 133Cs were used. Initial concentrations of non-radioactive cesium in the waste sample were varied to generate an equilibrium isotherm for cesium. Majority of the tests were conducted at 25±2 °C using a liquid to solid phase ratio of ∽100 ml/g and at a contact time of 72 hours. Two additional tests were conducted at a liquid to solid phase ratio of 10 and at contact time of 120 hours. The measured distribution coefficient (Kd) for radioactive cesium (137Cs) was 948 ml/g, the Kd for non-radioactive cesium (133Cs) was 1039 ml/g. The Kd for nonradioactive cesium decreased from 1039 to 691 ml/g with increased initial cesium concentration from ∽8 to 64 μg/ml. Very little change of the Kd was observed at initial cesium concentration above 64 ∽g/ml. The maximum sorption capacity for cesium on granular RF resin was 1.17 mmole/g dry resin. This value was calculated from the fit of the equilibrium isotherm data to the Dubinin-Radushkevich equation. Previously, a total capacity of 2.84 mmole/g was calculated by Bibler and Wallace for air-dried RF resin.

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Hassan, N.M., Adu-Wusu, K. & Marra, J.C. Resorcinol - formaldehyde adsorption of cesium from Hanford waste solutions, Part I. Batch equilibrium study. Journal of Radioanalytical and Nuclear Chemistry 262, 579–586 (2004). https://doi.org/10.1007/s10967-004-0479-6

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