Selective sorption of rubidium by potassium cobalt hexacyanoferrate

Naidu, G; Nur, T; Loganathan, P; Kandasamy, J; Vigneswaran, S

Selective sorption of rubidium by potassium cobalt hexacyanoferrate

Naidu, G

Nur, T

Loganathan, P Kandasamy, J Vigneswaran, S

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Publication Type:: Journal Article
Citation:: Separation and Purification Technology, 2016, 163 pp. 238 - 246
Issue Date:: 2016-05-11

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Field	Value	Language
dc.contributor.author	Naidu, G https://orcid.org/0000-0002-6406-3444	en_US
dc.contributor.author	Nur, T https://orcid.org/0000-0001-6286-7716	en_US
dc.contributor.author	Loganathan, P	en_US
dc.contributor.author	Kandasamy, J	en_US
dc.contributor.author	Vigneswaran, S https://orcid.org/0000-0002-8117-4322	en_US
dc.date.issued	2016-05-11	en_US
dc.identifier.citation	Separation and Purification Technology, 2016, 163 pp. 238 - 246	en_US
dc.identifier.issn	1383-5866	en_US
dc.identifier.uri	http://hdl.handle.net/10453/122686
dc.description.abstract	© 2016 Elsevier B.V. All rights reserved. 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 (5 mg/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 96.2 mg/g) and cesium (Cs) (Langmuir maximum sorption 60.6 mg/g) compared to other metals such as lithium (Li), sodium (Na) and calcium (Ca) (sorption capacity < 2 mg/g). KCoFC sorption capacity for Rb was affected only when Cs was present at twice the concentration of Rb, while the influence of other metals (Li, Na, and Ca) was minimal even at high concentrations. High Rb sorption capacity was due to the exchange of Rb for K inside the crystal lattice and strong sorption on the sorbent surface. These were evident from the data on K release during Rb sorption and reduced negative zeta potential at the sorbent surface in the presence of Rb, respectively. Kinetic sorption of Rb was satisfactorily described by the pseudo-second order model with intraparticle diffusion and exchange of Rb with structural K acting as major rate limiting steps. Up to 74% desorption of Rb was achieved with 0.1 M KCl. Overall, the results established the superior selectivity of KCoFC for Rb sorption.	en_US
dc.relation	http://purl.org/au-research/grants/arc/DP150101377
dc.relation.ispartof	Separation and Purification Technology	en_US
dc.relation.isbasedon	10.1016/j.seppur.2016.03.001	en_US
dc.subject.classification	Chemical Engineering	en_US
dc.title	Selective sorption of rubidium by potassium cobalt hexacyanoferrate	en_US
dc.type	Journal Article
utslib.citation.volume	163	en_US
utslib.for	0301 Analytical Chemistry	en_US
utslib.for	0904 Chemical Engineering	en_US
pubs.embargo.period	Not known	en_US
pubs.organisational-group	/University of Technology Sydney
pubs.organisational-group	/University of Technology Sydney/Faculty of Engineering and Information Technology
pubs.organisational-group	/University of Technology Sydney/Faculty of Engineering and Information Technology/School of Civil and Environmental Engineering
pubs.organisational-group	/University of Technology Sydney/Strength - CTWW - Centre for Technology in Water and Wastewater Treatment
utslib.copyright.status	open_access
pubs.publication-status	Published	en_US
pubs.volume	163	en_US

Abstract:

© 2016 Elsevier B.V. All rights reserved. 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 (5 mg/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 96.2 mg/g) and cesium (Cs) (Langmuir maximum sorption 60.6 mg/g) compared to other metals such as lithium (Li), sodium (Na) and calcium (Ca) (sorption capacity < 2 mg/g). KCoFC sorption capacity for Rb was affected only when Cs was present at twice the concentration of Rb, while the influence of other metals (Li, Na, and Ca) was minimal even at high concentrations. High Rb sorption capacity was due to the exchange of Rb for K inside the crystal lattice and strong sorption on the sorbent surface. These were evident from the data on K release during Rb sorption and reduced negative zeta potential at the sorbent surface in the presence of Rb, respectively. Kinetic sorption of Rb was satisfactorily described by the pseudo-second order model with intraparticle diffusion and exchange of Rb with structural K acting as major rate limiting steps. Up to 74% desorption of Rb was achieved with 0.1 M KCl. Overall, the results established the superior selectivity of KCoFC for Rb sorption.

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http://hdl.handle.net/10453/122686