Ion exchange experiments were carried out for the removal of trace caesium (
 137
Cs) and trace strontium (
 89
Sr) by different cationic forms of a titanosilicate analogue of the mineral pharmacosiderite. Selectivity factors were estimated by determining batch distribution coefficients (K
 d
) as a function of sodium, potassium, magnesium and calcium ion concentration. Other effects studied were pH, increasing caesium and strontium ion concentration, hydrolysis of the sodium form exchanger, the presence of the complexing agents EDTA, citrate and borate, and the resistance of the material to radiation damage.

Ion exchange of caesium and strontium on a titanosilicate analogue of the mineral pharmacosiderite

Natural clinoptilolite, of relatively low-grade, was investigated for its capability to remove cesium and strontium ions from water and simulated seawater. To improve its capacity, the material was pre-activated with concentrated NaCl and HCl solutions. Additionally, it was milled to a number of

The effect of pre-activation and milling on improving natural clinoptilolite for ion exchange of cesium and strontium

The effect of cationic surfactants on improving natural clinoptilolite for the flotation of cesium.

Use of a zeolite-modified electrode for the study of the methylviologen–sodium ion-exchange in zeolite Y

Synthetic zeolites X & Y have been examined for their abilities to take in Co, Ni and Zn radioisotopes. Distribution coefficients (Kd) have been determined, with and without competing cations, and at various pH values. Elution studies on zeolites containing Co, Ni and Zn radioisotopes considered the effect of acid and alkaline conditions, calcination and cement encapsulation. Leach rates arising from these experiments have been calculated. The general conclusions can be drawn are that zeolites X & Y are suitable for decontamination of aqueous wastes containing Co, Ni and Zn. Cement encapsulation is appropriate but no advantage accrues from pre-calcination. Some comments on the likely mechanism of leaching losses have been made.

http://zetox.jp/img/pdf/zeolite_neclear_treatement.pdf

Zeolites for nuclear waste treatment: Co, Ni, Zn uptake into synthetic faujasites X & Y

Radioactive waste disposal

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Radioactive waste disposal