Rubidium extraction using an organic polymer encapsulated potassium copper hexacyanoferrate sorbent

Handle URI:
http://hdl.handle.net/10754/617286
Title:
Rubidium extraction using an organic polymer encapsulated potassium copper hexacyanoferrate sorbent
Authors:
Naidu, Gayathri; Loganathan, Paripurnanda; Jeong, Sanghyung; Johir, Md.Abu Hasan; To, Vu Hien Phuong; Kandasamy, Jaya; Vigneswaran, Saravanamuthu
Abstract:
Sea water reverse osmosis (SWRO) brine contains significant quantity of Rb. As an economically valuable metal, extracting Rb using a suitable and selective extraction method would be beneficial. An inorganic sorbent, copper based potassium hexacyanoferrate (KCuFC), exhibited high selectivity to extract Rb compared to potassium hexacyanoferrate consisting of other transition metal combinations such as Ni, Co and Fe. An organic polymer (polyacrylonitrile, PAN) encapsulated KCuFC (KCuFC-PAN) achieved a Langmuir maximum Rb sorption capacity of 1.23 mmol/g at pH 7.0 ± 0.5. KCuFC-PAN showed Rb selectivity over a wide concentration range of co-existing ions and salinity of SWRO brine. High salinity (0.5-2.5 M NaCl) resulted in 12-30% sorption capacity reduction. At a molar ratio of Li:Rb (21:1), Cs:Rb (0.001:1) and Ca:Rb (14,700:1) commonly found in SWRO brine, sorption reduction of only 18% occurred. Nevertheless, at a very high K:Rb molar ratio (7700:1), KCuFC-PAN sorption capacity of Rb reduced significantly by 65-70%. KCuFC-PAN was well suited for column operation. In a fixed-bed KCuFC-PAN column (influent concentration 0.06 mmol Rb/L, flow velocity 2 m/h), two sorption/desorption cycles were successfully achieved with a maximum Rb sorption capacity of 1.01 (closely similar to the batch study) and 0.85 mmol/g in the first and second cycles, respectively. Around 95% of Rb was desorbed from the column with 0.2 M KCl. Resorcinol formaldehyde (RF) resin showed promising results of separating Rb from K/Rb mixed solution in effluents from a fixed-bed column, and a subsequent sequential acid desorption, producing 68% purified Rb.
KAUST Department:
Water Desalination & Reuse Research Cntr; Biological and Environmental Sciences and Engineering (BESE) Division
Citation:
Rubidium extraction using an organic polymer encapsulated potassium copper hexacyanoferrate sorbent 2016 Chemical Engineering Journal
Publisher:
Elsevier BV
Journal:
Chemical Engineering Journal
Issue Date:
11-Jul-2016
DOI:
10.1016/j.cej.2016.07.038
Type:
Article
ISSN:
13858947
Sponsors:
This work was funded by Australian Research Council Discovery Research Grant (DP150101377).
Additional Links:
http://linkinghub.elsevier.com/retrieve/pii/S1385894716309858
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Articles

Full metadata record

DC FieldValue Language
dc.contributor.authorNaidu, Gayathrien
dc.contributor.authorLoganathan, Paripurnandaen
dc.contributor.authorJeong, Sanghyungen
dc.contributor.authorJohir, Md.Abu Hasanen
dc.contributor.authorTo, Vu Hien Phuongen
dc.contributor.authorKandasamy, Jayaen
dc.contributor.authorVigneswaran, Saravanamuthuen
dc.date.accessioned2016-07-21T10:06:49Z-
dc.date.available2016-07-21T10:06:49Z-
dc.date.issued2016-07-11-
dc.identifier.citationRubidium extraction using an organic polymer encapsulated potassium copper hexacyanoferrate sorbent 2016 Chemical Engineering Journalen
dc.identifier.issn13858947-
dc.identifier.doi10.1016/j.cej.2016.07.038-
dc.identifier.urihttp://hdl.handle.net/10754/617286-
dc.description.abstractSea water reverse osmosis (SWRO) brine contains significant quantity of Rb. As an economically valuable metal, extracting Rb using a suitable and selective extraction method would be beneficial. An inorganic sorbent, copper based potassium hexacyanoferrate (KCuFC), exhibited high selectivity to extract Rb compared to potassium hexacyanoferrate consisting of other transition metal combinations such as Ni, Co and Fe. An organic polymer (polyacrylonitrile, PAN) encapsulated KCuFC (KCuFC-PAN) achieved a Langmuir maximum Rb sorption capacity of 1.23 mmol/g at pH 7.0 ± 0.5. KCuFC-PAN showed Rb selectivity over a wide concentration range of co-existing ions and salinity of SWRO brine. High salinity (0.5-2.5 M NaCl) resulted in 12-30% sorption capacity reduction. At a molar ratio of Li:Rb (21:1), Cs:Rb (0.001:1) and Ca:Rb (14,700:1) commonly found in SWRO brine, sorption reduction of only 18% occurred. Nevertheless, at a very high K:Rb molar ratio (7700:1), KCuFC-PAN sorption capacity of Rb reduced significantly by 65-70%. KCuFC-PAN was well suited for column operation. In a fixed-bed KCuFC-PAN column (influent concentration 0.06 mmol Rb/L, flow velocity 2 m/h), two sorption/desorption cycles were successfully achieved with a maximum Rb sorption capacity of 1.01 (closely similar to the batch study) and 0.85 mmol/g in the first and second cycles, respectively. Around 95% of Rb was desorbed from the column with 0.2 M KCl. Resorcinol formaldehyde (RF) resin showed promising results of separating Rb from K/Rb mixed solution in effluents from a fixed-bed column, and a subsequent sequential acid desorption, producing 68% purified Rb.en
dc.description.sponsorshipThis work was funded by Australian Research Council Discovery Research Grant (DP150101377).en
dc.language.isoenen
dc.publisherElsevier BVen
dc.relation.urlhttp://linkinghub.elsevier.com/retrieve/pii/S1385894716309858en
dc.rightsNOTICE: this is the author’s version of a work that was accepted for publication in Chemical Engineering Journal. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Chemical Engineering Journal, 11 July 2016. DOI: 10.1016/j.cej.2016.07.038en
dc.subjectPotassium copper hexacyanoferrateen
dc.subjectPurificationen
dc.subjectReverse osmosis brineen
dc.subjectRubidiumen
dc.subjectSeawateren
dc.subjectSorptionen
dc.titleRubidium extraction using an organic polymer encapsulated potassium copper hexacyanoferrate sorbenten
dc.typeArticleen
dc.contributor.departmentWater Desalination & Reuse Research Cntren
dc.contributor.departmentBiological and Environmental Sciences and Engineering (BESE) Divisionen
dc.identifier.journalChemical Engineering Journalen
dc.eprint.versionPost-printen
dc.contributor.institutionFaculty of Engineering, University of Technology Sydney (UTS), P.O. Box 123, Broadway, NSW 2007 Australiaen
dc.contributor.affiliationKing Abdullah University of Science and Technology (KAUST)en
kaust.authorJeong, Sanghyungen
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