Comparison of hollow fiber membrane and solvent extraction techniques for extraction of cerium and preparation of ceria by stripping precipitation

Rout, P.C.; Sarangi, K.

doi:10.1002/jctb.4426

Cited by 6 publications

(3 citation statements)

References 28 publications

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“…1c) were chosen for study because of their well-known coordination properties, particularly with regard to interactions with lanthanides. 31,[37][38][39] Chargeneutral receptor complexes of cerium and nitrate (with innerand outer-sphere coordination) are favored in low-dielectric constant oils. 40 The coordination structures with each of these receptors have been reported previously (see citations in various sections below) and were further confirmed in the present organic solutions using Ce L 3 -edge EXAFS (extended X-ray absorption fine structure).…”

Section: Ce 4þmentioning

confidence: 99%

Trapped in the coordination sphere: nitrate ion transfer driven by the cerium(iii/iv) redox couple

Ellis

Bera

Reinhart

et al. 2016

Phys. Chem. Chem. Phys.

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Redox-driven ion transfer between phases underpins many biological and technological processes, including industrial separation of ions. Here we investigate the electrochemical transfer of nitrate anions between oil and water phases, driven by the reduction and oxidation of cerium coordination complexes in oil phases. We find that the coordination environment around the cerium cation has a pronounced impact on the overall redox potential, particularly with regard to the number of coordinated nitrate anions. Our results suggest a new fundamental mechanism for tuning ion transfer between phases; by 'trapping' the migrating ion inside the coordination sphere of a redox-active complex. This presents a new route for controlling anion transfer in electrochemically-driven separation applications.

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Section: Ce 4þmentioning

confidence: 99%

Trapped in the coordination sphere: nitrate ion transfer driven by the cerium(iii/iv) redox couple

Ellis

Bera

Reinhart

et al. 2016

Phys. Chem. Chem. Phys.

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“…They found that more indium was extracted when the operating temperature was lower than 293 K and 1 M H 2 SO 4 was the best stripping agent to recover indium from the loaded organic phase. Although extraction of metals by SX can be easily achieved and has high throughput, interference of different ions, emulsion formation, co-extraction and consumption of bulk amounts of reagent are noted as major disadvantages of this technology [13][14].…”

Section: Introductionmentioning

confidence: 99%

Recovery of Indium from LCD Waste by Solvent Extraction and the Supported Liquid Membrane with Strip Dispersion Using D<sub>2</sub>EHPA as the Extractant

Yen

Chang

Laohaprapanon

et al. 2016

SERDJ

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The feasibility to recover indium (In) from discarded liquid crystal display (LCDs) panels by solvent extraction (SX) and a hollow fiber supported liquid membrane with strip dispersion (SLM-SD) system was investigated in this study. Di-(2-ethylhexyl)phosphoric acid (D 2 EHPA) was used as the extractant and the mobile carrier in SX and SLM-SD. The effect of different parameters such as pH, concentration of D 2 EHPA and stripping agents has been investigated for indium extraction. The average amount of indium in LCD screen was found to be 330 mg/kg and 70% of this indium was easily leached out by 3 M HCl in 30 min. An increase in the D 2 EHPA concentration from 0.025 to 0.25 M increased the extraction of indium and 79% of indium can be recovered by back-extraction with 2 M hydrochloric acid. For the SLM-SD system, more than 94% of indium can be recovered within 20 min under the same operating conditions. This indicates that the SLM-SD was more efficient for indium extraction than SX. However, a poor separation of iron and indium resulted on increasing the extraction time. Hence, process optimization for iron removal must be explored in a future work.

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“…[47] [48] [49] [50][51]. These experiments were performed at low feed/strip flow rates on average of 200 mL/min.…”

mentioning

confidence: 99%

Isotope harvesting from the beam dump cooling loop at the facility for rare isotope beams (FRIB)

Scott¹

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Isotope harvesting from the beam dump cooling loop of the Facility for Rare Isotope Beams (FRIB) offers usable quantities of many isotopes unavailable anywhere else in the world. Many of these co-produced isotopes are of significant interest for research in biomedicine, energy, environmental studies, and materials science, and yet they are destined for disposal. One option for retrieval of these rare isotopes is harvesting from the spent mixed-bed resin in a batch collection mode. Alternatively, Hollow Fiber Supported Liquid Membrane (HFSLM) extraction poses a method of quickly retrieving these rare isotopes while overcoming the challenges associated with the beam dump environment: ultra-trace concentrations (ppt), high flow rates (4-6 L/s), neutral pH environment (6-7), vast mixture of elements, and a high radiation environment (1.3 kGy/hr). After one to two years of operation, the two 50-gallon resin tanks of Purolite NRW3460 mixed-bed resin will be hydraulically removed for transfer to storage tanks for waste shipment, at which point the isotopes will be accessible for harvesting. The lanthanides contained within this waste are of particular interest because their long half-lives and high energy density make them excellent candidates for use in nuclear batteries. 177Lu was chosen as a radiotracer to determine the feasibility of harvesting long-lived lanthanides from the mixed-bed resin. This work describes a method for high recovery of the lanthanides utilizing strong acid recirculation coupled with removal of the extracted lanthanides with an Eichrom DGA cartridge. Ninety-seven percent of dosed lanthanides were recovered from a surrogate system into only thirty milliliters of dilute acid, while utilizing approximately three column volumes of strong acid for elution. V was chosen as a radiotracer to determine the feasibility of using HFSLM extraction to remove short-lived transition metals from the beam dump loop. Part per trillion levels of 48V were successfully recovered from the aqueous feed solution spiked with chemically similar species at flow rates of 6 gallons/hour (450 mL/min.) utilizing 0.15 M Aliquat 336 in 3% dodecanol/dodecane in the HFSLM pores and 0.5 M ammonia in 0.1 M ammonium nitrate as the stripping solution. The chemical extraction efficiency from this matrix was found to be 71% in 60 minutes. This is the first ever demonstration of part per trillion level recovery with HFSLM extraction. 177Lu was chosen as a radiotracer to determine the feasibility of using HFSLM extraction to remove lanthanides from the beam dump loop. Preliminary benchtop liquid-liquid extraction tests showed successful extraction of Lu from a neutral pH feed solution with 5 mM Octyl(phenyl)-N,N-diisobutyl- carbamoylmethylphosphine oxide (CMPO) in a room temperature ionic liquid, 1-Hexyl-3methylimidazolium bis(trifluoromethylsulfonyl) imide [C6mim][Tf2N]; however, upon testing with a Liqui-Cel 1.7x10 mini module membrane contactor, it was discovered that the RTIL degraded the polycarbonate mini-module causing cracking and leaking, and no lutetium migrated to the strip solution. It is hypothesized that the high viscosity of the RTIL prevents permeation into the HFSLM pores.

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Comparison of hollow fiber membrane and solvent extraction techniques for extraction of cerium and preparation of ceria by stripping precipitation

Cited by 6 publications

References 28 publications

Trapped in the coordination sphere: nitrate ion transfer driven by the cerium(iii/iv) redox couple

Trapped in the coordination sphere: nitrate ion transfer driven by the cerium(iii/iv) redox couple

Recovery of Indium from LCD Waste by Solvent Extraction and the Supported Liquid Membrane with Strip Dispersion Using D<sub>2</sub>EHPA as the Extractant

Isotope harvesting from the beam dump cooling loop at the facility for rare isotope beams (FRIB)

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