Rubidium extraction using an organic polymer encapsulated potassium copper hexacyanoferrate sorbent
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Type
ArticleAuthors
Naidu, GayathriLoganathan, Paripurnanda
Jeong, Sanghyun
Johir, Md.Abu Hasan
To, Vu Hien Phuong
Kandasamy, Jaya
Vigneswaran, Saravanamuthu
KAUST Department
Biological and Environmental Sciences and Engineering (BESE) DivisionWater Desalination and Reuse Research Center (WDRC)
Date
2016-07-12Online Publication Date
2016-07-12Print Publication Date
2016-12Permanent link to this record
http://hdl.handle.net/10754/617286
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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.Citation
Rubidium extraction using an organic polymer encapsulated potassium copper hexacyanoferrate sorbent 2016 Chemical Engineering JournalSponsors
This work was funded by Australian Research Council Discovery Research Grant (DP150101377).Publisher
Elsevier BVJournal
Chemical Engineering JournalAdditional Links
http://linkinghub.elsevier.com/retrieve/pii/S1385894716309858ae974a485f413a2113503eed53cd6c53
10.1016/j.cej.2016.07.038