Studies on adsorption of rare earth elements from nitric acid solution with macroporous silica-based bis(2-ethylhexyl)phosphoric acid impregnated polymeric adsorbent

Shu, Qiding; Khayambashi, Afshin; Wang, Xinpeng

doi:10.1177/0263617417748112

Cited by 34 publications

(22 citation statements)

References 64 publications

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“…The bands at 1071 and 1048 cm − 1 of MIL-101-C50 can be attributed to symmetric P-O stretching. At lower frequencies, all phosphorous-grafted adsorbents showed a sharp peak in the range of 960-908 cm − 1 , which can be ascribed to P-O stretching [50][51][52][53]. The presence of these new peaks in the structure provides strong evidence for successful functionalization of MIL-101.…”

Section: Ftir Spectramentioning

confidence: 99%

Selective recovery and separation of rare earth elements by organophosphorus modified MIL-101(Cr)

Kavun

Veen

Repo

2021

Microporous and Mesoporous Materials

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Development of state-of-the-art selective adsorbent materials for recovery of rare earth elements (REEs) is essential for their sustainable usage. In this study, a metal-organic framework (MOF), MIL-101(Cr), was synthesized and post-synthetically modified with optimised loading of the organophosphorus compounds tributyl phosphate (TBP), bis(2-ethylhexyl) hydrogen phosphate (D2EHPA, HDEHP) and bis(2,4,4-trimethylpentyl) phosphinic acid (Cyanex®-272). The materials were characterized and their adsorption efficiency towards Nd 3+ , Gd 3+ and Er 3+ from aqueous solutions was investigated. The MOF derivatives demonstrated an increase in adsorption capacity for Er 3+ at optimal pH 5.5 in the order of MIL-101-T50 (37.2 mg g − 1 ) < MIL-101-C50 (48.9 mg g − 1 ) < MIL-101-H50 (57.5 mg g − 1 ). The exceptional selectivity of the materials for Er 3+ against transition metal ions was over 90%, and up to 95% in the mixtures with rare earth ions. MIL-101-C50 and MIL-101-H50 demonstrated better chemical stability than MIL-101-T50 over 3 adsorption− desorption cycles. The adsorption mechanism was described by the formation of coordinative complexes between the functional groups of modifiers and Er 3+ ions.

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Section: Ftir Spectramentioning

confidence: 99%

Selective recovery and separation of rare earth elements by organophosphorus modified MIL-101(Cr)

Kavun

Veen

Repo

2021

Microporous and Mesoporous Materials

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“…Recovery of rare earth elements from uranium concentrate by using cation exchange resin (Dowex 50WX8) was studied and the authors reported that the maximum REE sorption capacity was found to 82.74 mg/g which represents about 93.23% of the original capacity of the studied resin [ 15 ]. Sorption of rare earth elements from nitric acid solution with macroporous silica-based bis(2-ethylhexyl)phosphoric acid impregnated polymeric adsorbent has been studied by Shu et al [ 16 ] Their results indicated that the adsorption capacity of Gd (III) was found to be 0.315 mmol g −1 by bis(2-ethylhexyl)phosphoric acid/SiO 2 -P in 0.1 M HNO 3 . Adsorption and separation of terbium(III) and gadolinium(III) from aqueous nitrate medium has been investigated using TVEX-PHOR resin by Madbouly et al [ 17 ].…”

Section: Introductionmentioning

confidence: 99%

Modeling and equilibrium studies on the recovery of praseodymium (III), dysprosium (III) and yttrium (III) using acidic cation exchange resin

2022

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In this research, the possibility of using hydrogenated Dowex 50WX8 resin for the recovery and separation of Pr(III), Dy(III) and Y(III) from aqueous nitrate solutions were carried out. Dowex 50WX8 adsorbent was characterized before and after sorption of metal ions using Fourier-transform infrared spectroscopy (FT-IR), Scanning Electron Microscope (SEM) and Energy Dispersive X-Ray Analysis (EDX) techniques. Sorption parameters were studied which included contact time, initial metal ion concentration, nitric acid concentration and adsorbent dose. The equilibrium time has been set at about 15.0 min. The experimental results showed that the sorption efficiency of metal ions under the investigated conditions decreased with increasing nitric acid concentration from 0.50 to 3.0 M. The maximum sorption capacity was found to be 30.0, 50.0 and 60.0 mg/g for Pr(III), DY(III) and Y(III), respectively. The desorption of Pr(III) from the loaded resin was achieved with 1.0 M citric acid at pH = 3 and found to be 58.0%. On the other hand, the maximum desorption of Dy(III) and Y(III) were achieved with 1.0 M nitric acid and 1.0 M ammonium carbonate, respectively. The sorption isotherm results indicated that Pr(III) and Y(II) fitted with nonlinear Langmuir isotherm model with regression factors 0.995 and 0.978, respectively; while, Dy(III) fitted with nonlinear Toth isotherm model with R2 = 0.966. A Flow sheet which summarizes the sorption and desorption processes of Pr(III), DY(III) and Y(III) using Dowex 50WX8 from nitric acid solution under the optimum conditions is also given.

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“…This FTIR deviation pattern was previously reported on Gd adsorption using D2EHPA-impregnated resins. 38 Field emission scanning electron microscopy Table 7 shows a morphological comparison of the fresh and spent PK216 resin during the adsorption studies. The size of the spent PK216-Pr, PK216-Gd, and PK216-Dy decreased by 30-40% compared to the fresh resin.…”

Section: Resultsmentioning

confidence: 99%

Adsorptive capacity and kinetic studies of PK216 resin for the extraction of Pr, Gd, and Dy rare earth elements

Hidayah

Roslan

Osazuwa

et al. 2023

J of Chemical Tech & Biotech

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BACKGROUNDThe removal of rare earth elements (REE) ions from aqueous solutions is a challenging task, and it requires a cost‐effective and readily available adsorbent material with excellent performance. In this study, PK216 resin was utilized for the adsorption kinetics and mechanism studies of REE ions owing to its outstanding performance, low cost, and easy availability.RESULTSThe findings revealed that higher loading resulted in increased adsorption capacity, while pH and temperature adjustments had minimal effects on the adsorption process, which remained constant within the pH range of 1–6 and a temperature range of 25–85 °C. Moreover, the thermodynamic parameters showed that the adsorption reaction for praseodymium (Pr) and gadolinium (Gd) was spontaneous and exothermic, whereas for dysprosium (Dy) it was endothermic due to its high hydration enthalpy. This characteristic nature of Dy requires additional energy from the surroundings to dissociate from the aqueous phase and proceed to the PK216 resin surface compared to Pr and Gd. The Langmuir model and pseudo‐second‐order reaction were found to be the fitting models for the adsorption process on PK216 resin. Additionally, the chemisorption of Pr, Gd, and Dy resulted in monolayer coverage. The diffusion process was found to be intraparticle and film diffusion, as it fitted the Boyd kinetic model as opposed to the Weber–Morris intraparticle model.CONCLUSIONThe results indicate that higher loading enhances the adsorption capacity, and the Langmuir model and pseudo‐second‐order reaction are the most suitable models for the adsorption process on PK216 resin. © 2023 Society of Chemical Industry

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Studies on adsorption of rare earth elements from nitric acid solution with macroporous silica-based bis(2-ethylhexyl)phosphoric acid impregnated polymeric adsorbent

Cited by 34 publications

References 64 publications

Selective recovery and separation of rare earth elements by organophosphorus modified MIL-101(Cr)

Selective recovery and separation of rare earth elements by organophosphorus modified MIL-101(Cr)

Modeling and equilibrium studies on the recovery of praseodymium (III), dysprosium (III) and yttrium (III) using acidic cation exchange resin

Adsorptive capacity and kinetic studies of PK216 resin for the extraction of Pr, Gd, and Dy rare earth elements

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