Selective sorption of rubidium by potassium cobalt hexacyanoferrate

Naidu, Gayathri; Nur, Tanjina; Loganathan, P.; Kandasamy, Jaya; Vigneswaran, S.

doi:10.1016/j.seppur.2016.03.001

Cited by 87 publications

(69 citation statements)

References 28 publications

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“…The methods currently available for extracting Rb include sorption, evaporation, precipitation, use of emulsion membranes and liquid-liquid extraction techniques [12,13]. Of these applications, ion exchange and sorption are the most widely used [14,15]. One of the main problems encountered in most studies on the sorption of Rb is that they mostly focused on its sorption from solutions containing only Rb.…”

Section: Desalination and Water Treatmentmentioning

confidence: 99%

“…One of the main problems encountered in most studies on the sorption of Rb is that they mostly focused on its sorption from solutions containing only Rb. They did not consider solutions containing a mixture of metals where there may be competition between metals for sorption [14,15]. To remove alkali metals from solution, different types of sorbents such as clay materials [16], Prussian blue [17], potassium metal hexacyanoferrate [11,18], zeolite [19], titanium dioxide [20] and ammonium molybdophosphate [21] had been used.…”

Section: Desalination and Water Treatmentmentioning

confidence: 99%

“…All of these sorbents revealed a high capacity to remove Cs from nuclear waste brine with varying degrees of success. Very few studies have been reported on these sorbents for the extraction of Rb [11,15,22]. Previous studies have shown that potassium metal hexacyanoferrate had high sorption capacity for Rb compared to other sorbents.…”

Section: Desalination and Water Treatmentmentioning

confidence: 99%

“…A previous batch desorption study showed that of the following reagents-0.1 M of HNO 3 , KOH, KCl, NaCl, HCl and NaOH-0.1 M KCl was the most efficient in desorbing Rb [15]. Therefore, this reagent was used in the column desorption study.…”

Section: Desorption Of Rbmentioning

confidence: 99%

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Rubidium recovery using potassium cobalt hexacyanoferrate sorbent

Nur

Naidu

Loganathan

et al. 2016

Desalination and Water Treatment

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A B S T R A C TRubidium (Rb) is a highly valued and economically important metal present in large quantities in many natural and wastewaters. However, its recovery is hampered by its low concentration and extracting agents' limited selectivity. A batch sorption study showed that a potassium cobalt hexacyanoferrate (KCoFC) sorbent had much higher sorption capacities for Rb and caesium (Cs) than for lithium (Li), sodium (Na) and calcium (Ca). Equilibrium sorption data at pH 7 and 24 ± 1˚C for Rb and Cs satisfactorily fitted to the Langmuir model with sorption maxima of 96 and 61 mg/g, respectively. A fixed-bed column (12 cm height) containing a mixture of 2.2 g KCoFC and 19.8 g granular activated carbon had a breakthrough sorption capacity of 61 mg/g when a solution containing 5 mg Rb/L was passed through the column at a velocity of 2.5 m/h (0.7 L/h). When 1 and 5 mg Cs/L were added to the Rb solution, Rb sorption capacity dropped to 46 and 41 mg/g, respectively. During Rb sorption, K from the KCoFC lattice was released. Leaching the column containing sorbed Rb with 0.1 M KCl for 60 min at a velocity of 10 m/h desorbed 99% of sorbed Rb. A process for recovering Rb from sea water reverse osmosis brine is presented.

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Section: Desalination and Water Treatmentmentioning

confidence: 99%

Section: Desalination and Water Treatmentmentioning

confidence: 99%

Section: Desalination and Water Treatmentmentioning

confidence: 99%

Section: Desorption Of Rbmentioning

confidence: 99%

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Rubidium recovery using potassium cobalt hexacyanoferrate sorbent

Nur

Naidu

Loganathan

et al. 2016

Desalination and Water Treatment

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“…Heteropoly acid was used to react with, and generate precipitate to achieve separation in precipitation method [5,6]. The adsorbents used by ion exchange process include zeolite [7,8], ferricyanide [9] and ammonium phosphomolybdate and so on [10]. Due to the high cost, low exchange capacity and mechanical strength, the application for rubidium and cesium recovery in a large-scale has been limited seriously.…”

Section: Introductionmentioning

confidence: 99%

Recovery of Rubidium and Cesium from Brines by Solvent Extraction

Chen¹,

Wang²,

Li³

et al. 2017

dtmse

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Abstract. Recovery of rubidium and cesium from brines by solvent extraction is of great significance to comprehensively utilize rubidium and cesium from the brine resources of salt lake brine, underground water and oil/gas field brine. Three kinds of extraction agents including phenols, crown ethers and other reagents used in domestic and overseas were summarized systematically, and the advantages and disadvantages were also demonstrated. The key problems existed in the extraction of rubidium and cesium from salt lake brines were pointed out, and the new trends in the future were also discussed.

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Simultaneous adsorption of Li(I) and Rb(I) by dual crown ethers modified magnetic ion imprinting polymers

et al. 2019

Applied Organom Chemis

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With the gradual exhaustion of land mineral resources, oceans and lakes have attracted world attention because they are abundant in inorganic mineral resources including lithium, potassium, rubidium and cesium. Lithium is becoming the key material in manufacturing of primary and secondary batteries used in various portable devices and hybrid/electric vehicles. Rubidium has been widely applied inglobal positioning satellites, magneto‐optic modulators, solid‐state lasers, phosphors, and glass manufacturing. In this work, a novel dual‐functional magnetic ion imprinting polymer (Fe3O4@SiO2@IIPs) powder was prepared using 12‐crown‐4 (12C4) and 18‐crown‐6 (18C6) as functional monomer, and characterized by FT‐IR, elemental analysis, XRD, TGA, SEM and TEM. The adsorption performance of Fe3O4@SiO2@IIPs for simultaneous adsorption of lithium and rubidium from simulative salt lakes was evaluated by batches of experiments at various pH values, contact time, and initial concentrations. Kinetic experiments show that the adsorption process followed the pseudo second order kinetic model. Langmuir adsorption isotherm model and Freundlich adsorption equilibrium data were fitted; the results show that Langmuir isotherm model is more suitable for the adsorption process. Additionally, Fe3O4@SiO2@IIPs exhibit specificity towards Li(I) and Rb(I) and low competitive behavior with Na(I), K(I) and Mg (II). Additionally, the selectivity properties, reusability and adsorption thermodynamic were also investigated. The obtained results show that the prepared Fe3O4@SiO2@IIPs material remains high adsorption capacities after five cycles, exhibits excellent abilities to simultaneously and selectively recover Li+ and Rb+ and have a promising application in the simultaneous adsorption of lithium and rubidium ions.

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Selective sorption of rubidium by potassium cobalt hexacyanoferrate

Cited by 87 publications

References 28 publications

Rubidium recovery using potassium cobalt hexacyanoferrate sorbent

Rubidium recovery using potassium cobalt hexacyanoferrate sorbent

Recovery of Rubidium and Cesium from Brines by Solvent Extraction

Simultaneous adsorption of Li(I) and Rb(I) by dual crown ethers modified magnetic ion imprinting polymers

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