Separation of rare earth elements by anion-exchange chromatography using ethylenediaminetetraacetic acid as mobile phase

Fernández, R; Alonso, J. Ignacio García

doi:10.1016/j.chroma.2007.12.008

Cited by 45 publications

(16 citation statements)

References 28 publications

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“…These elements are chemically classified by their ionic radii in three groups: (I) light REE from La to Pr, (II) medium REE from Nd to Gd, and (III) heavy REE from Tb to Lu. Their ionic radii are close to that of calcium, therefore all of these elements can act as calcium anatagonist [16][17][18] . REE in magnesium alloying are predominantly used for strengthening and to improve corrosion resistance 19 .…”

Section: Introductionmentioning

confidence: 99%

Evaluation of short-term effects of rare earth and other elements used in magnesium alloys on primary cells and cell lines☆

Feyerabend¹,

Fischer²,

Holtz³

et al. 2010

Acta Biomaterialia

519

263

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Degradable magnesium alloys for biomedical application are on the verge of being used clinically. Rare earth elements (REE) are used to improve the mechanical properties of the alloys, however in more or less undefined mixtures. Therefore in this study the in vitro cytotoxicity of the elements yttrium (Y), neodymium (Nd), dysprosium (Dy), praseodymium (Pr), gadolinium (Gd), lanthanum (La), cerium (Ce), europium (Eu), lithium (Li), zirconium (Zr), was evaluated by incubation with the chlorides (10-2000 µM), magnesium (Mg) and calcium (Ca) were tested at higher concentrations (200 and 50 mM, respectively). The influence on viability of human osteosarcoma cell line MG-63, human umbilical cord perivascular (HUCPV) cells and mouse macrophages (RAW 264.7) was determined, as well as the induction of apoptosis and the expression of inflammatory factors (TNF-α, IL-1α). Significant differences between the applied cells could be observed. RAW exhibited the highest and HUCPV the lowest sensitivity. La and Ce showed the highest cytotoxicity of the analysed elements. From the elements with high solubility in magnesium alloys Gd and Dy seem to be more suitable than Y. The focus of magnesium alloy development for biomedical applications should include most defined alloy compositions with well known tissue specific and systemic effects.

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Section: Introductionmentioning

confidence: 99%

Evaluation of short-term effects of rare earth and other elements used in magnesium alloys on primary cells and cell lines☆

Feyerabend¹,

Fischer²,

Holtz³

et al. 2010

Acta Biomaterialia

519

263

View full text Add to dashboard Cite

show abstract

“…According to Fernandez and Garc´ıa Alonso, [24] the degree of complexation increases with increasing atomic number of the elements and therefore its effect on the resulting charge of the complex which results in an elution order throughout the series from Lu to La. 13 Trials using DTPA at pH 1 and 2 showed very wide peaks with serious overlapping (chromatogram not presented for brevity) Using 0.05 M AHIBA at pH 3, wide peaks for heavy REEs was obtained while lowering the eluent concentration to 0.02 M showed very long elution time without significant improvement in the separation of Lu and Yb (Fig 8 ).…”

Section: The Effect Of Eluent Type/ Concentration and Phmentioning

confidence: 99%

Group Separation of Heavy Metals Followed by Subsequent and Individual Separation of Lanthanides by Chelation Chromatography

Borai

Ekhlom

Harjula

2014

Journal of Liquid Chromatography & Related Technologies

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A new method was developed for group separation of some heavy metals (HM) from rare earth elements (REEs) followed by online individual separation of REEs. Various chelating agents were used as mobile phases such as DTPA, PDCA, NTA, HIBA and oxalic acid. These chelating agents were selected with different number of carboxylic acid groups and various geometrical structures which control the elution capability and the separation efficiency. The results showed that selective group separation of HM from REEs could be achieved by different options including 0.0005 M PDCA at pH 1, 0.005 M DTPA at pH 2, 0.1 M AHIBA at pH 2 or 0.0007 M NTA at pH 2. The selective elution of HM is attributed to the stronger complex formation between the carboxylic acid groups of the chelating agent with divalent HM ions than with trivalent REE ions especially at relatively low pH values. NTA chelating agent was selected for further investigation to test the individual separation of REEs. Finally, the optimum chromatographic conditions showed that HREEs and IREEs could be efficiently separated by 0.001 M NTA at pH 3 while LREEs were separated by 0.005M AHIBA at pH 4 followed by 0.001M PDCA at pH 2.

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“…A troca iônica é preferencial para o polimento dos produtos obtidos da lixiviação e extração por solventes, devido à baixa concentração das TRs a serem retiradas da solução (Fernández & García Alonso, 2008, Streat, 1986, Texier et al, 2002.…”

Section: Introductionunclassified

Avaliação Do Uso De Biomassa Bacteriana Imobilizada Na Biossorção De Terras-Raras Leves E Médias

Coimbra

Nascimento

Giese

2017

HOLOS

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A busca por fontes alternativas de recuperação e separação dos elementos puros de terras--raras (TRs) é vista como uma ação prioritária e estratégica por diversos países demandantes desses elementos. Em alternativa aos processos clássicos de extração de TRs, o processo de biossorção vem sendo avaliado, em uma combinação da biotecnologia e metalurgia extrativa. Sendo assim, o presente trabalho buscou avaliar a capacidade da biomassa imobilizada da bactéria Bacillussubtilis na biossorção de lantânio (TR leve) e samário (TR médio), visando seu uso na separação desses elementos. As maiores porcentagens de biossorção de lantânio (La) e samário (Sm) em sistemas mono--elementares corresponderam à 94,4% e 94,9%, respectivamente, a partir de concentrações iguais (C i ) à 15 mg/L. Em soluções com C i = 100 mg/L, 89,3% de La e 91,9% de Sm foram biossorvidos. O mesmo comportamento pode ser observado para a solução bi--elementar La+Sm, onde 79,9% de La e 88,8% de Sm foram biossorvidos em soluções com C i = 15 mg/L, e, 69,4% de La e 83,4% de Sm foram biossorvidos em C i =100 mg/L. A aplicação dos dados obtidos aos modelos de adsorção de Langmuir e Freundlich demonstrou que as isotermas de adsorção obtidas para La e Sm em ambos os sistemas avaliados foram satisfatórias para ambos os modelos, sugerindo a ocorrência da biossorção em monocamada assim como condições heterogêneas na superfície, onde ambas condições podem co--existir sob as condições experimentais testadas. PALAVRAS--CHAVE:Bacillussubtilis, imobilização celular, alginato de cálcio, biossorção, terras--raras EVALUATION OF THE USE OF BACTERIAL IMMOBILIZED BIOMASS IN LIGHT AND MEDIUM RARE--EARTH ELEMENTS BIOSORPTION ABSTRACTThe search for alternative sources of recovery and separation of pure rare earth elements (REE) is a priority and strategic action by several countries demanding these elements. As an alternative to classical processes of extraction of REE, the biosorption process has been evaluated in a combination between biotechnology and extractive metallurgy. Therefore, the present work aimed to evaluate the capacity of immobilized biomass of Bacillus subtilis to the biosorption of lanthanum (light REE) and samarium (medium REE), aiming its use in the separation of these elements. The highest percentages of lanthanum (La) and samarium (Sm) biosorption in single--element systems corresponded to 94.4% and 94.9%, respectively, from an initial concentration ( i C) of 15 mg/L. In solutions with i C= 100 mg/L, 89.3% of La and 91.9% of Sm were biosorbed. The same behavior can be observed for the bi--elemental solution La + Sm, where 79.9% of La and 88.8% of Sm were biosorbed in solutions of i C= 15 mg/L, and 69.4% of La and 83.4% of Sm were biosorbed in i C= 100 mg/L. The application of the data obtained to the adsorption models of Langmuir and Freundlich showed that the adsorption isotherms obtained for La and Sm in both systems were satisfactory for both models, suggesting the occurrence of monolayer biosorption as well as heterogeneous surface conditions, where bot...

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Separation of rare earth elements by anion-exchange chromatography using ethylenediaminetetraacetic acid as mobile phase

Cited by 45 publications

References 28 publications

Evaluation of short-term effects of rare earth and other elements used in magnesium alloys on primary cells and cell lines☆

Evaluation of short-term effects of rare earth and other elements used in magnesium alloys on primary cells and cell lines☆

Group Separation of Heavy Metals Followed by Subsequent and Individual Separation of Lanthanides by Chelation Chromatography

Avaliação Do Uso De Biomassa Bacteriana Imobilizada Na Biossorção De Terras-Raras Leves E Médias

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