Adsorption of rare earths with crown ether adsorbents

Shih, Jeng‐Shang; Tsay, Lin-Mei; Wu, Shaw‐Chii

doi:10.1039/an9851001387

Cited by 15 publications

(5 citation statements)

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“…5). Granular entrapped adsorbents of crown ether-phosphotungstic acid (PW) and crown ether-phosphomolybdic add (PMo) in polyacrylamide-denoted granular CEPP adsorbents and powdery crown ether-PW (or PMo) adsorbents were prepared and used to adsorb rare-earth ions 26 and heavy-metal ion8 27 such as Ag", Pb 2 +, Hg 2 +, Cd 2 +, Fe 3 + and Zn 2 +. For the adsorption of rare-earth ions, adsorbents containing 15crown-S, such as 15-crown-S-PMo were better adsorbents than the other crown-ether adsorbents (Fig.…”

Section: Resultsmentioning

confidence: 99%

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Applications of Macrocyclic Polyethers in Analytical Sensors and Ion Separation

Shih¹

1994

J Chinese Chemical Soc

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Artificial macrocyclic polyethers were synthesized and applied as neutral carriers for ion‐selective PVC membrane electrodes, ion‐chromatographic packing materials, extractants and adsorbents for ion separation, coating materials for piezoeletrical membrane sensors for organic species, and ion‐transport carriers through liquid membranes. Ion‐selective electrodes such as those for K+ Na+, UO22+, Cs+, Pb2+, Fe3+, Hg2+ and Ag+ ions based on crown ether‐phosphotungstic acid (PW) precipitates and dithio crown ethers respectively were prepared and showed good sensitivity and selectivity. Crown ether‐PW precipitates were applied as adsorbents of rare‐earth ions and some common heavy‐metal ions. Some rare‐earth ions were easily extracted with crown ethers, especially 15‐crown‐5. Poly(stytene/divinyl benzene) cryptand‐22 resin was synthesized and applied as a bifunctional stationary phase of ion chromatography to separate bom cations and anions, even some organic carboxylate geometric isomers. Crown ethers such as mono‐benzo‐15‐crown‐5 was successfully applied as a coating material on piezoelectric quartz membrane sensors for some organic species. The oscillation frequency of the crown‐ether quartz‐membrane sensor was sensitive to organic vapours such as amines and alcohols. Upon adsorption of organic species on the crown‐ether quartz membrane, the oscillation frequency of the sensor decreased obviously. Special crown ether such as dibenzo‐16‐crown‐5‐oxyacetic acid, decyl‐cryptand‐22 and 1, 4‐dihydro‐pyridine‐18‐crown‐5 were synthesized and successfully applied as ion‐transport carriers (ionophores) for transport of Na+ K+ and Mg2+ ions through liquid membranes.

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Section: Resultsmentioning

confidence: 99%

“…es 70 H LA Ce Pl Nd 'm~tnEuG<lTbl>rH~[y 1mYb l» Graph of distribution coefficients (0) versus atomic numbers of rare earth ions extracted by IS-crown-5. l S Apparatus for preparation of granuiar entrapped crown ether-PW (or PMo)-polyacryJamide (CEPP) adsorbents 26.…”

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confidence: 99%

Applications of Macrocyclic Polyethers in Analytical Sensors and Ion Separation

Shih¹

1994

J Chinese Chemical Soc

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“…A large number of organic and inorganic adsorbents have been employed for the adsorption of REEs, such as alumina, crown ethers, ionic-liquid impregnated resins, chitosan, silica and carbon based nanomaterials (graphene oxide and carbon nanotubes). , Among these, activated carbons (ACs) are widely being explored as adsorbents and catalysts in the emerging field of environmental and energy applications because of their well-developed porous structure and tunable surface chemistry. , The interest for using activated carbon (AC) in adsorption processes may be explained by the unlimited availability of natural carbon sources (such as agricultural waste), , its environmentally friendly nature, its low cost and its ability to be used in a wide range of process temperatures and pressures. , The adsorbing property of AC can be enhanced by proper oxidation methods, so as to create oxygen containing functional groups, such as −OH, CO, CO, −COOH and −COOR, at the most reactive centers of the carbon matrix …”

Section: Introductionmentioning

confidence: 99%

“…5,6 Among these, adsorption is generally considered the preferred technology, due to its combined simplicity, effectiveness and low cost. 7 A large number of organic and inorganic adsorbents have been employed for the adsorption of REEs, such as alumina, 8 crown ethers, 9 ionic-liquid impregnated resins, 10 chitosan, 11 silica 12 and carbon based nanomaterials (graphene oxide and carbon nanotubes). 13,14 Among these, activated carbons (ACs) are widely being explored as adsorbents and catalysts in the emerging field of environmental and energy applications because of their well-developed porous structure and tunable surface chemistry.…”

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confidence: 99%

Ethylenediaminetriacetic Acid-Functionalized Activated Carbon for the Adsorption of Rare Earths from Aqueous Solutions

Babu

Binnemans

Roosen

2018

Ind. Eng. Chem. Res.

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A novel and low-cost EDTA-functionalized activated carbon (EDTA-AC) was synthesized by anchoring N- [(3-trimethoxysilyl)propyl]ethylenediamine triacetic acid (TMS-EDTA) to oxidized activated carbon (AC). Material characterization was done by FTIR and Raman spectroscopy, TGA, N 2 physisorption, SEM and the Boehm titration method, the latter being used to determine the amount and type of oxygen functional groups present in carbon samples. EDTA-AC was tested for the adsorption and separation of rare-earth ions from aqueous solutions, in order to evaluate the feasibility of using this material for the recovery of rare earths from industrial residues and electronic waste, like batteries, magnets and lamp phosphors. The maximum adsorption capacity of EDTA-AC was derived for Nd(III) by constructing an adsorption isotherm and fitting the data to the Langmuir adsorption model. A kinetic and thermodynamic study were performed by varying the contact time and the temperature and plotting the corresponding adsorption data to the pseudo-second-order kinetic model and the Van 't Hoff equation, respectively. The affinity of EDTA-AC for each of the lanthanide ions was determined and from binary mixtures of La/Ni, Sm/Co and Eu/Y, the highest selectivity was observed for the rare earths. The adsorbed metal ions could be recovered and the adsorbent regenerated by treatment with a dilute solution of HCl, thus showing the (large-scale) potential of EDTA-functionalized AC for the recovery of rare earths from aqueous waste streams.

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“…Consequently, it is an important issue to find effective and selective sorbents for the preconcentration of terbium ions. For this purpose, resins and modified forms of these [14][15][16], activated carbon [17], and crown ether adsorbents [18] have mostly been applied.…”

Section: Introductionmentioning

confidence: 99%

Use of Na-modified clinoptilolite for the removal of terbium ions from aqueous solution

Vyviurska¹,

Vasylechko²,

Gryshchouk³

et al. 2012

Chem. Met. Alloys

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In this study, Na-modified Transcarpathian clinoptilolite was used for preconcentration of trace amounts of terbium(III) ions from aqueous solutions. The sorbent was characterized by thermogravimetric analysis. The influence of the preliminary thermal treatment on the sorption activity of Na-modified clinoptilolite was thoroughly investigated. In addition, it was found that such characteristics of the solution as the terbium concentration, acidity, and ion strength have an effect on the sorption capacity of the zeolite in dynamic conditions. The optimum pH range of the solution was found to be 8.8-9.0. A preliminary thermal treatment of Na-clinoptilolite in the temperature range 475-700°C increased the sorption capacity of the sorbent. 7M nitric acid, 6M hydrochloric acid, and 1M NaCl solutions were identified as effective desorbents of terbium(III) ions from Na-clinoptilolite. Furthermore, the influence of the most common ions on the uptake capacity of the sorbent was evaluated.

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Adsorption of rare earths with crown ether adsorbents

Cited by 15 publications

References 0 publications

Applications of Macrocyclic Polyethers in Analytical Sensors and Ion Separation

Applications of Macrocyclic Polyethers in Analytical Sensors and Ion Separation

Ethylenediaminetriacetic Acid-Functionalized Activated Carbon for the Adsorption of Rare Earths from Aqueous Solutions

Use of Na-modified clinoptilolite for the removal of terbium ions from aqueous solution

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