Removal of Cd (II) and Hg(II) by chelating resin Chelex-100

Amara-Rekkab, Afaf; Didi, Mohamed Amine

doi:10.13005/ojc/310122

Cited by 6 publications

(12 citation statements)

References 16 publications

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“…The radioactivity of 90 Y and 90 Sr, the relative extraction percentage (% E ) and the amount ( q e ) of Y 3+ and/or Sr 2+ between the sorbent phase and the aqueous solution were then computed from their activities before and after extraction as reported [ 38 , 39 ]. The distribution ratio (D, mL/g) of Y 3+ and/or Sr 2+ were also calculated using the following equation [ 43 ]:

where V is the volume of solution (mL) and W is the mass of the dry ion exchanger (g). The quantity ( q e ) of Y 3+ extracted per unit mass of the sorbent (mol g −1 ) was then calculated as reported earlier [ 39 ].…”

Section: Methodsmentioning

confidence: 99%

Sorption Characteristics and Chromatographic Separation of 90Y3+ from 90Sr2+ from Aqueous Media by Chelex-100 (Anion Ion Exchange) Packed Column

El-Shahawi,

Alwael,

Alsibaai

et al. 2024

International Journal of Analytical Chemistry

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There is growing demand for separation of 90Y carrier free from 90Sr coexisting to produce high purity 90Y essential for radiopharmaceutical uses. Thus, in this context the sorption profiles of Y3+ and Sr2+ from aqueous solutions containing diethylenetriaminepenta acetic acid (DTPA), ethylenediaminetetra-acetic acid (EDTA), acetic acid, citric acid, or NaCl onto Chelex-100 (anion ion exchange) solid sorbent were critically studied for developing an efficient and low-cost methodology for selective separation of Y3+ from Sr2+ ions (1.0 × 10−5 M). Batch experiments displayed relative chemical extraction percentage (98 ± 5.4%) of Y3+ from aqueous acetic acid solution onto Chelex-100 (anion ion exchanger), whereas Sr2+ species showed no sorption. Hence, a selective separation of Y3+ from its parent 90Sr2+ has been established based upon percolation of the aqueous solution of Y3+ and Sr2+ ions containing acetic acid at pH 1-2 through Chelex-100 sorbent packed column at a 2 mL min−1 flow rate. Y3+ species were retained quantitatively while Sr2+ ions were not sorbed and passed through the sorbent packed column without extraction. The sorbed Y3+ species were then recovered from the sorbent packed column with HNO3 (1.0 M) at a 1.0 mL min−1 flow rate. A dual extraction mechanism comprising absorption associated to “weak-base anion exchanger” and “solvent extraction” of Y3+ as (YCl6)3− and an extra part for “surface adsorption” of Y3+ by the sorbent is proposed. The established method was validated by measuring the radiochemical (99.2 ± 2 1%), radionuclide purity and retardation factor (Rf = 10.0 ± 0.1 cm) of 90Y3+ recovered in the eluate. Ultimately, the sorbent packed column also presented high stability for reusing 2-3 cycles without drop in its efficiency (±5%) towards Y3+ uptake and relative chemical recovery. A proposed flow sheet describing the analytical procedures for the separation of 90Y3+ from 90Sr2+ using chelating Chelex 100 (anion exchange) packed column is also included.

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Section: Methodsmentioning

confidence: 99%

Sorption Characteristics and Chromatographic Separation of 90Y3+ from 90Sr2+ from Aqueous Media by Chelex-100 (Anion Ion Exchange) Packed Column

El-Shahawi,

Alwael,

Alsibaai

et al. 2024

International Journal of Analytical Chemistry

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“…Over the last years the considerable success has been achieved in using of different organic and inorganic adsorbents for the selective concentration of elements [8][9][10]. From this point of view, polymeric chelating sorbents show high activity [11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

ADSORPTION OF Fe (III) IONS ON MODIFIED ADSORBENT: ADSORPTION ISOTHERMS

Eyyubova¹

2022

AChJ

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This work is devoted to the synthesis of a new type of adsorbent based on maleic anhydride styrene copolymer (MAST) and N,N`-diphenylguanidine (S) and its modification with 4,4'-(ethane-1,2-diylbis(azanylylidene))bis(pentane-2-one) (S+R). Adsorption study of Fe (III) ions with this adsorbent has been carried out. Effects of the pH value, contact time, ionic strength and the initial concentration of metal ions on the adsorption capacity of the product have been studied. In the course of research, several adsorption isotherms and kinetic models have been studied and the equilibrium data has been found to agree well with the pseudo-second-order model, and the pseudo-second-order model can describe the adsorption process. The results best fit the Langmuir adsorption isotherm model. The studies have shown that compared to the initial product (S), for which the adsorption capacity was 404.88 mg/g, the reagent-modified adsorbent (S+R) shows higher adsorption capacity over Fe(III) ions which is equal to 890.68 mg/g. Synthesized adsorbent was characterized by the Scanning Electron Microscopy (SEM) with Energy Dispersive X-ray Spectroscopy (EDS) and Ultraviolet-visible Spectroscopy (Uv/Vis). Temperature stability of adsorbent has been studied by thermal analysis methods (TG, DTA, DDTA)

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“…Several classical common and/or commercial extractants like; Cyphos ® IL-101 9 ,dialkyl sulphoxides 10 ,4-acylpyrazolone 11 , 2-hydroxy-4-sec-octanpyldiphenyl-ketoxime 12 , Acorga ® Cl x 50, 8-hydroxyquinoline, tributylphosphate (TBP), Aliquat 336, Cyanex 923, Cyanex 471X 13,14 have been used for the extraction of pd(II) from hydrochloric acid solutions. In general, these extractants have several problems like poor solubility in aliphatic diluents, slow kinetics of extraction, chemical stability, and pH sensitivity, etc [15][16][17] . In view of these limitations, it becomes necessary to develop of new classes of ligands.…”

Section: Introducationmentioning

confidence: 99%

Recovery of Palladium from Concentrated Nitrate Solutions with N,N 2-Dimethyl-N,N 2-Dioctyltetradecy lmalonamide as New Extractant

Mowafy¹,

Mohamed²

2017

Orient. J. Chem

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The new unsymmetrical malonamide namely; N,N2-dimethyl-N,N 2-dioctyltetradecylmalonamide (DMDOT DMA) was prepared and evaluated as agent for the extraction and separation of Pd (II) from nitrate media was studied. N,N 2-dimethyl-N,N 2-dioctylmalonamide (DMDO MA) was synthesized and used for comparison purpose. The effect of various parameters had been studied in details to explain the extraction properties of pd(II) by using DMDOTDMA in mixed diluents (75 vol.% n-dodecane-25 vol.% n-octanol) from nitrate media. The extraction equilibrium of Pd(II) with the investigated maloamides was reached within 10 minutes. Pd(II) showed remarkable extractability by DMDOTDMA and the maximum extraction percentage of Pd(II) is nearly reached at ~ 5 M HNO 3 . Under similar extraction conditions Zn(II), Ni(II), Mn(II) Cu(II) and Pb(II) were found poorly extracted. The dominate extracted species of Pd(II) is Pd(NO 3 ) 2 (MA) 2 . The separation of Pd(II) from other studied metal ions was found to be effective in the range of nitric acid solution used. The stripping of Pd(II) was successfully carried out by single contact with 0.1M thiourea solution.

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Removal of Cd (II) and Hg(II) by chelating resin Chelex-100

Cited by 6 publications

References 16 publications

Sorption Characteristics and Chromatographic Separation of 90Y3+ from 90Sr2+ from Aqueous Media by Chelex-100 (Anion Ion Exchange) Packed Column

Sorption Characteristics and Chromatographic Separation of 90Y3+ from 90Sr2+ from Aqueous Media by Chelex-100 (Anion Ion Exchange) Packed Column

ADSORPTION OF Fe (III) IONS ON MODIFIED ADSORBENT: ADSORPTION ISOTHERMS

Recovery of Palladium from Concentrated Nitrate Solutions with N,N 2-Dimethyl-N,N 2-Dioctyltetradecy lmalonamide as New Extractant

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