H. Mimura et al., Alkali hydrothermal synthesis of zeolites from coal fly ash and their uptake properties of cesium ion, J NUC SCI T, 38(9), 2001, pp. 766-772
Zeolites were synthesized from coal fly ash by hydrothermal treatment with
KOH solutions. K-H zeolite (K2Al2Si4O12. nH(2)O) was produced under optimum
conditions of 160 degreesC, 3 d, 1 M (=mol/dm(3)) KOH and liquid-solid rat
io of 15 cm(3)/g. The uptake behavior of radioactive cesium for the product
s was investigated by batch and column methods. The uptake equilibrium of C
s+ for the above product was attained within 2 h yielding the distribution
coefficient of above 10(4) cm(3)/g. The uptake of Cs+ was followed by a Lan
gmuir adsorption isotherm and the maximum uptake capacity was estimated to
be 3.34 mmol/g. The successive removal of Cs+ was accomplished through the
column packed with granular composites of product-alginate gel polymer.