Influence of the potassium and ammonium ion concentrations on the selective sorption of 137Cs by illite and clinoptilolite

Returning land contaminated as a result of radiation accidents to farming use

“…Popov et al (2011) have shown that the capacity of selective sites in clinoptilolite is also higher than in schistose silicate (illite). Therefore, clinoptilolite was a more selective sorbent for caesium with higher affinity than glauconite in various aqueous solutions.…”

“…The cation exchange capacity of aluminosilicates was provided by selective sorption sites, located in tetrahedral spaces of the aluminosilicate crystal lattice (exchanging ions are Na þ , K þ , Ca 2þ , Mg 2þ ); another group of selective sorption sites is wedge-shaped lateral locations on lateral cleavages of microcrystals (Popov et al, 2011) and on nonselective sites of lateral faces of tetrahedrons (hydroxyl groups, whose dissociation was increased with increasing pH). Selectivity of some sorption sites in aluminosilicates was conditioned by steric effects.…”

The study of selectivity of caesium sorption by a natural and surface-modified glauconite in presence of potassium and ammonium ions

“…, K ? and NH 4 ? ions contained in natural waters soil solutions and liquid radioactive wastes should significantly affect the caesium sorption by natural aluminosilicates due to a low difference between their ionic radii.…”

“…Selectivity of natural aluminosilicates is described in a number of publications [4][5][6]. It is shown that natural aluminosilicates possess both selective and nonselective sorption sites.…”

“…The selectivity of these sorption sites is conditioned by sterric factors of competing ions, since the diameter of hydrated caesium ion is very similar to the size of the tetrahedral interstice in the aluminosilicate's crystal lattice. Wedge-shaped lateral locations on lateral defects of microcrystals are another group of selective sorption sites [4]. In addition, sorption sites on basal faces of schistose silicates (glauconite is a schistose silicate [7]) show relatively high affinity to caesium ions [5].…”