The results of laboratory experiments on the sorption separation of uranium and rare-earth elements from nitrate-phosphate solutions on a solid extractant with an active phase in the composition of the heter-oradical phosphine oxide and di- (2-ethylhexyl)phosphoric acid are reported. This extractant was used to attain high capacity …
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Sorption of 9 rare earth elements (REE) by 6 living seaweeds was investigated. Comparison between the behaviour in mono- and multi-element solutions was discussed. High removal in mono-element solutions was verified for all REE with U. lactuca. A preference towards Light REE in mono-element solutions was observed.
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34 rowsThis study evaluated the REY (lanthanides + yttrium) sorption and partition coefficients (Kd) in ...
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Abstract. Sorption methods for the concentration and separation of rare earth elements are reviewed. Sorbents based on organic polymers, specifically strongly and …
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Sorption on the activated carbon or other carbonaceous sorbents is of considerable industrial importance because lanthanides are characterized by the possibility of separation of lanthanides as well as non-clear solutions, a large recovery capacity even in dilute solutions and their insolubility in the analyzed solutions containing rare earth ...
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Sorption of rare earth elements (REEs) and Ce oxidation on natural and synthetic Mn oxides have been investigated by many researchers. Although Mn(II)-oxidizing microorganisms are thought to play an important role in the formation of Mn oxides in most natural environments, Ce oxidation by biogenic Mn oxide and the relevance of …
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Rare earth elements (REEs) have emerged as a critical component in manufacturing various products for green technology. This paper aims to comprehensively review the formation of ion adsorption clay, REEs weathering profile, clay minerals' potential in adsorbing REEs, ion-exchange mechanism and method for REEs extraction, and the …
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The influence of solution complexation on the sorption of yttrium and the rare earth elements (YREEs) by amorphous ferric hydroxide was investigated at 25 °C over a range of pH (4.0–7.1) and carbonate concentrations (0 M ⩽ [CO 3 2-] T ⩽ 150 μ M).
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Concentration of rare earth ions (RE 3+) liquor produced from monazite digestion is measured before sorption process with the aid of Ion coupled plasma. The result illustrated in Table 5 . The concentration of (RE 3+ ) after sorption process is measured by shaking 20 ml of the liquor digested solution for 24 h at 25 ℃ with 0.1 g of …
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Phosphonic acid functionalization of gellan gum and chitosan biopolymers was successfully performed. In the first step, the sorption was investigated using La(III) ions before testing for the recovery of rare earth elements (REEs) from pretreated industrial acidic leachate. The sorbent was characterized by Fourier-transform infrared (FTIR), …
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Manganese oxides are important scavengers of rare earth elements (REE) in hydrosystems. However, it has been difficult to include Mn oxides in speciation models due to the lack of a comprehensive set of sorption reactions consistent with a given surface complexation model (SCM), as well as discrepancies between published sorption data …
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@article{Takahashi2005AdsorptionOR, title={Adsorption of rare earth elements onto bacterial cell walls and its implication for REE sorption onto natural microbial mats}, author={Yoshio Takahashi and Xavier Ch{^a}tellier and Keiko Hattori and Kenji Kato and Daniel Fortin}, journal={Chemical Geology}, year={2005}, volume={219}, pages={53 …
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Electro-sorption has been used for water purification and desalination, but little research on the recovery of rare earth element (REE) in aqueous solution. In this work, sodium diphenylamine sulfonate (SDAS) modified the activated carbon (AC) on carbon felt (CF) is used to recovery the La(III), Nd(III) and Ce(III) ions by electro-sorption ...
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The choice of an appropriate method for rare earth element (REE) preconcentration from industrial by-products is a very difficult task. Most of the REE separation reviews focus on liquid extraction methods, whereas sorption processes are usually mentioned in connection with chromatographic individual REE separation.
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Rare earth element sorption onto hydrous manganese oxide: A modeling study 1. Introduction. The distributions of rare earth elements (REEs) in natural waters …
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High efficient separation of U(VI) and Th(IV) from rare earth elements in strong acidic solution by selective sorption on phenanthroline diamide functionalized graphene oxide. Author links open overlay panel Fuhai Li a, Zheng Yang a, Hanqin Weng a, Geng Chen a, Mingzhang Lin a b, Chi Zhao c.
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Adsorption process proves to be a promising, effective and cost-effective method for the recovery of rare earths metals. Adsorption was found to influence by contact time, adsorbent dose, initial concentration, solution pH and temperature. Among tested isotherm and kinetic models, Langmuir and pseudo-second order were found to fit well …
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Rare earth elements sorption to iron oxyhydroxide: Model development and application to groundwater 1. Introduction. The great interest in determining the …
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Iron oxyhydroxides are among the most important colloids that control rare earth elements (REE) concentrations and transport in natural hydrosystems. In this study, REE surface complexation to iron oxyhydroxides (Fe(OH) 3 (a)) was described by using the Donnan diffuse layer model and a two-site (i.e. ≡Fe s OH and ≡Fe w OH) model. The …
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Adsorption of rare earth elements (REE) onto the cell walls of Bacillus subtilis (a gram-positive bacterium) and Escherichia coli (a gram-negative bacterium) was studied between pH 2.5 and 4.5 and at various bacterial concentrations. The distribution coefficients of REE between the bacterial cell surface and water showed a pattern with a …
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1. Introduction. Rare earth elements (REEs) are composed of 17 elements in the periodic table including the 15 lanthanides, yttrium and scandium [1], [2].REEs became more and more important because of the development of new technologies as wind turbines, hybrid cars, computer equipment, catalytic converters, photovoltaic thin films or energy …
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In this study, rare earth element (REE) binding constants and site concentration on the Gram+ bacteria surfaces were quantified using a multi-site Langmuir isotherm model, along with a linear programming regression method (LPM), applied to fit experimental REE sorption data.
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The recycling of valuable metals such as rare earth elements and the valorization of low-grade resources (industrial ... have been successfully tested for the recovery of metal ions, including uranium [15, 37] and rare earths [38]. However, the sorption capacities were usually low (in the range 0.5−0.62 mmol g −1 for Er(III), Tb(III) …
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Highlights • Sorption of 9 rare earth elements (REE) by 6 living seaweeds was investigated. • Comparison between the behaviour in mono- and multi-element …
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Phosphonate-bearing composite highly efficient for rare earth sorption at pH 5. • Fast kinetics (fitted by pseudo-first order rate equation); contact time: 20 min. • Maximum sorption capacity: 1.43 mmol La g −1 and 1.02 mmol Tb g −1 (Langmuir model). • Readily desorption and easy sorbent recycling with high selectivity for REEs. •
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The sorption capacity at the optimum pH (i.e., 4) reaches 0.9 mmol Nd g -1 and 1 mmol Gd g -1. Uptake kinetics are modeled by the pseudo-first-order rate equation (equilibrium time: 30-40 min). At pH close to 4-5, the sorbent shows high selectivity for rare-earth elements against alkali-earth elements. This selectivity is confirmed by the ...
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Global resources of heavy Rare Earth Elements (REE) are dominantly sourced from Chinese regolith-hosted ion-adsorption deposits in which the REE are inferred to be weakly adsorbed onto clay...
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Regolith-hosted ion-adsorption deposits (IADs), formed by subtropical weathering of igneous rocks, are the world's primary source for heavy rare earth elements (HREEs, Gd-Lu and Y) 1, 2. These ...
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@article{osti_1761196, title = {Sorption of rare-earth elements onto a ligand-associated media for pH-dependent extraction and recovery of critical materials}, author = {Hovey, Jessica L. and Dardona, Mohammed and Allen, Matthew J. and Dittrich, Timothy M.}, abstractNote = {Toward recovering rare-earth elements, we prepared a …
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The recovery of three rare earth (RE) metals ions [Yb(III), Dy(III) and Nd(III), belonging to heavy, mild and light REs, respectively] was investigated using hybrid chitosan-magnetic nano-based particles functionalized by diethylenetriamine (DETA). The effect of pH on sorption performance was analyzed: the optimum initial pH value was found close to …
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Acidic thermal water originating from the Kusatsu geothermal area of Gunma Prefecture, Japan is introduced into rivers, where there are many anthropogenicobjects such as a neutralization plant, a dam and water channels for hydroelectric power plants.We have investigated changes in the physico-chemical nature and fractionation mechanisms of …
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Sorption characteristics of ion exchange resins 001×7, 005×8, D72 regarding rare earth metals (REM) during extraction from barren solution of uranium sorption in dynamic conditions were investigated. It was identified that D72 resin capacity on analyzed REM was 2.46 mg·cm−3 after passing 220 BV (bed volume) of initial solution with 95 % …
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The role of the rare earth elements on the sorption characteristics of the Zr–Co getter films has been studied in the literature [10], [11]. Petti et al. [10] utilized X-ray photoelectron spectroscopy (XPS) to reveal activation temperature of Zr–Co–RE thin films at 250–450 °C compatible with wafer bonding or sealing processes range ...
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Desorption efficiency was found to be greater than 97% with 0.1 mol/L HNO 3 after three sorption-desorption cycles, ... Rare earth elements (REEs) are essential for hundreds of applications in the fields of permanent magnets, batteries, fluorescent materials, laser crystals, alloys, ceramics, catalysts, superconductors, etc. ...
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Using batch experiments, REE sorption onto biochar was analyzed from pH 3 to 9 and IS 10 −1 mol/L to 10 −3 mol/L. Rare earth element patterns show a Middle REE (MREE) downward concavity at acidic pH and low ionic strength. These patterns are in good agreement with existing datasets quantifying REE binding with humic substances.
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Recovery of rare earth was studied by electro-sorption. • The adsorption capacity reaches nearly 600 mg g −1. • The obtained rare earth products are La (OH) 3, …
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