Abstract
Physicochemical relationships of the 137Cs recovery from alkaline solutions using resorcinol-formaldehyde resins were studied. The instability of resorcinol-formaldehyde resins in alkaline solutions is due to oxidative degradation of the polymer. Oxidation of resorcinol-formaldehyde cation exchanger in alkaline solutions is accompanied by the loss of the selectivity to cesium, without changes in the capacity. An NMR study showed that oxidation in alkaline solutions is accompanied by cleavage of the bridging -CH2-bonds of the polymer. Intense depolymerization of the phenolic cation exchanger is concluded to be responsible for the decrease in the resin selectivity.
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