Selective sorption of rubidium by potassium cobalt hexacyanoferrate

•Potassium cobalt hexacyanoferrate (KCoFC) had high sorption capacity for Rb.•Rb was selectively sorbed by KCoFC in the presence of other alkali metals.•Langmuir sorption capacity was higher for Rb than Cs.•K release from KCoFC lattice was highest for Rb sorption among the alkali metals.•Intra-parti...

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Bibliographic Details
Published in:Separation and purification technology 2016-05, Vol.163, p.238-246
Main Authors: Naidu, Gayathri, Nur, Tanjina, Loganathan, Paripurnanda, Kandasamy, Jaya, Vigneswaran, Saravanamuthu
Format: Article
Language:English
Subjects:
Calcium
Cobalt
Exchange
Lithium
Low concentrations
Mathematical models
Potassium cobalt hexacyanoferrate
Rubidium
Sorption
Sorption isotherm
Sorption kinetics
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Summary:•Potassium cobalt hexacyanoferrate (KCoFC) had high sorption capacity for Rb.•Rb was selectively sorbed by KCoFC in the presence of other alkali metals.•Langmuir sorption capacity was higher for Rb than Cs.•K release from KCoFC lattice was highest for Rb sorption among the alkali metals.•Intra-particle diffusion and lattice K release controlled Rb sorption kinetics. Recovering economically valuable rubidium (Rb) from natural resources is challenged due to its low concentration and limited selectivity of extracting agents. Equilibrium and kinetic studies were conducted on the sorptive removal of Rb at low concentration (5mg/L) using a commercial and a laboratory prepared potassium cobalt hexacyanoferrate (KCoFC). These laboratory and commercial KCoFCs exhibited similar characteristics in terms of chemical composition, surface morphology (scanning electron microscopy) and crystal structure (X-ray diffraction peaks). KCoFC exhibited a higher sorption capacity for Rb (Langmuir maximum sorption 96.2mg/g) and cesium (Cs) (Langmuir maximum sorption 60.6mg/g) compared to other metals such as lithium (Li), sodium (Na) and calcium (Ca) (sorption capacity
ISSN:1383-5866
1873-3794
DOI:10.1016/j.seppur.2016.03.001