Contribution of cobalt ion precipitation to adsorption in ion exchange dominant systems

Utilization of chitosan–clinoptilolite composite for the removal of radiocobalt from aqueous solution: kinetics and thermodynamics

“…In Fig. 7, according to the hydrolysis constants of Co(II) (log K 1 = -9.6, log K 2 = -9.2, and log K 3 = -12.7) [24], the distribution of Co(II) species is shown as a function of pH. One can find that the low sorption at low pH can be attributed to the coulombic repulsion between Co 2?…”

Enhanced sorption of radiocobalt from water by Bi(III) modified montmorillonite: A novel adsorbent

“…With increasing pH, the surface sites are deprotonated and the hydrolysis of Co(II) also increases. According to the hydrolysis constants of Co(II) (log K 1 = −9.6, log K 2 = −9.2, and log K 3 = −12.7) [29], the distribution species of Co(II) as a function of pH is shown in Fig. 4.…”

Boron Removal by Adsorption on Cobalt(II) Doped Chitosan Bio-composite

“…In this study boron adsorption also depended on distribution of cobalt species, especially on the precipitation of cobalt hydroxide. As apparent from [41], the Co 2+ species remain dominant until pH of about 8 and then decrease sharply, to Co(OH) 2 species advantage, which exhibit a maximum at pH 11 and undergo precipitation as Co(OH) 2(s) .…”