More on Mechanism and Some Important Properties of Chromate Ion Exchange

Separation and concentration of cobalt from zinc plant acidic thiocyanate leach solutions containing cobalt and nickel by an emulsion liquid membrane using triisooctylamine as carrier

“…Therefore, the stripping solution volume fraction of the emulsion has a profound influence on extraction using ELMs. Change in the stripping solution volume fraction not only leads to a change in all emulsion properties, but also results in an increase in the capacity of the emulsion to extract the solute [32]. An increase in the stripping solution volume fraction shifts the internal drop size distribution toward larger sizes.…”

A new hybrid ion exchange-nanofiltration (HIX-NF) separation process for energy-efficient desalination: Process concept and laboratory evaluation

“…Previous research investigations pertaining to anion exchange demonstrated that the relative degree of substitution of hydrogen in amine functionality by an alkyl group is strongly correlated to divalent-monovalent anion selectivity [34][35][36][37][38]. The lesser the substitution of H atom in amine functional group by an alkyl group is, the higher is the divalent anion selectivity for that anion exchanger.…”

Selective extraction of chromium (VI) from multicomponent acidic solutions by emulsion liquid membranes using tributhylphosphate as carrier

“…Hexavalent chromium exists as anionic species such as HCrO 4 − , Cr 2 O 7 2− , and CrO 4 2− , which are highly mobile on subsurface environment [1]. These chromium (VI) anionic species are bioaccumulative due to their high mobility across biological cell membrane and oxidizing potential of these species make them highly toxic to biological systems [2].…”

“…The methodologies for the recovery of Cr(VI) from the aqueous solutions have been developed utilizing ion exchange [4], solvent extraction [5], non-dispersive solvent extraction [6,7] and membrane-based technologies. The membrane-based methods like nanofiltration [8], micellar-enchanced ultrafiltration [9,10], electro-dialysis [11] and facilitated transport [12,13] have been studied for chromium (VI) separation from aqueous media.…”