Sorption behavior of radionuclides on crystalline synthetic tunnel manganese oxides

被引:98
作者
Dyer, A
Pillinger, M
Newton, J
Harjula, R
Möller, T
Amin, S
机构
[1] Univ Salford, Div Chem, Sci Res Inst, Salford M5 4WT, Lancs, England
[2] Univ Helsinki, Lab Radiochem, Dept Chem, FI-00014 Helsinki, Finland
[3] British Nucl Fuels PLC, Warrington WA3 6AS, Cheshire, England
关键词
D O I
10.1021/cm001142v
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Cryptomelane-type (potassium) and todorokite-type (magnesium and calcium) manganese oxides were prepared and studied for the removal of radionuclides from aqueous solutions containing inactive metal ions of interest in radionuclide-bearing nuclear waste effluents. Batch distribution coefficients were measured as a function of pH and sodium, potassium, magnesium, and calcium ion concentrations. Trace strontium (Sr-89) and cesium (Cs-137) ions were taken up by ion-exchange mechanisms. Selectivity coefficients were estimated as K-Cs/K = 0,6 and K-Sr/K = 1.0 for cryptomelane and K-Cs/Mg = 7550, K-Sr/Mg = 50, and K-Sr/Ca = 10 for todorokite. The cryptomelane analogue was particularly effective for the separation of trace silver ions (Ag-110) in low-pH solutions. Todorokite analogues were effective for a wider range of radionuclides, including Co-57 across a wide pH range (1-10) and Cs-137 in acidic solution. The affinity sequence for magnesium and calcium ion-extracted (acid-treated) todorokites in 0.1 HNO3 was Cs-137 > Fe-59 > Cr-51 approximate to Co-57 approximate to Am-241 > Mn-54 > Ni-63 > Zn-65 > Pu-236 > Sr-89.
引用
收藏
页码:3798 / 3804
页数:7
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