Diglycolamic Acid–Grafted Film-Type Adsorbent for Selective Recovery of Rare Earth Elements

Ogata, Takeshi; Narita, Hirokazu; Tanaka, Mikiya; Muraki, Yuzo; Higuchi, Hiroyoshi; Nishigawara, Masaya

doi:10.15261/serdj.23.121

Cited by 8 publications

(8 citation statements)

References 18 publications

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“…To overcome such drawbacks, the extractant can be chemically anchored to the solid support. A literature survey show that diglycolamides and diglycolamic acid extractants have been grafted on polyamide matrix, 19 in a filmtype adsorbent, 20 as well as on silica gel particles, 21,22,23 mesoporous silica, 24,25 and oxide particles. 26 Interestingly, to the best of our knowledge, there is no evidence in the literature of the use of phenolic resin with incorporation of diglycolamides derivatives for REEs extraction.…”

Section: Introductionmentioning

confidence: 99%

Extraction and recovery of rare earths by chelating phenolic copolymers bearing diglycolamic acid or diglycolamide moieties

Arrambide

Arrachart

Berthalon

et al. 2019

Reactive and Functional Polymers

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Extraction and recovery of rare earth elements (REEs) have been studied using ion-exchange and chelating process thanks to phenol copolymeric resins. The ion-exchange and chelating resins have been prepared through an alkaline polycondensation reaction of phenolic diglycolamide derivatives with admixture of phenol, catechol or resorcinol in the presence of formaldehyde as crosslinker. The phenol copolymeric resins were fully characterized and involved in sorption experiments. The sorption experiments of rare earth elements have been investigated in different acidic conditions. Lanthanum (La), europium (Eu) and ytterbium (Yb) were chosen to represent the light, medium and heavy REEs respectively. Changes in the extraction properties of the copolymeric resins have been observed depending on the nature of chelating groups in the phenolic matrices and the extraction conditions. The results indicate that the synthesized materials are good sorbent for REEs with cation uptake capacity in the range 50-100 mg/g and in some cases above 150 mg/g.

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Section: Introductionmentioning

confidence: 99%

Extraction and recovery of rare earths by chelating phenolic copolymers bearing diglycolamic acid or diglycolamide moieties

Arrambide

Arrachart

Berthalon

et al. 2019

Reactive and Functional Polymers

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“…Ogata et al also prepared a graft-type adsorbent based on a nonwoven poly(vinyl alcohol) fabric that contained diglycol amic acid ligands, which were attached by graft polymerization. 31 Although the amount of diglycol amic acid on the graft-type adsorbent was 2.35 mmol/ g, the amount of adsorbed Dy ions was approximately 0.4 mmol/g in a 1 mmol/L Dy ion solution; thus, the low adsorption capacity might be due to the nature of the grafttype adsorbent. The effective separation of Sm and Co ions is significantly beneficial because these metals are critical for use in high-performance magnets, permanent magnets, and lithium-ion batteries.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

“…This has led to studies in which tridentate ligands are immobilized on water-insoluble materials. The immobilization of diglycol amic acid on silica gel or polymeric adsorbents has been reported; these materials could be used as practical adsorbents because of their low cost and ease of handling. − …”

Section: Introductionmentioning

confidence: 99%

Poly(vinyl diglycolic acid ester)-Grafted Polyethylene/Polypropylene Fiber Adsorbent for Selective Recovery of Samarium

Hamada

Hoshina

Seko

2022

ACS Appl. Polym. Mater.

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Poly(vinyl diglycolic acid ester)-grafted polyethylene fabric (PE-PDGA) containing 1.71−4.58 mmol/g millimolar equivalents (meqs) of immobilized tridentate ligand were prepared through radiation-induced graft polymerization of vinyl acetate, saponification, and a ring-opening reaction of diglycolic anhydride. PE-PDGA can adsorb rare earth metal ions, such as Sm, Nd, and Dy, at pH 2.5, with an increase in the removal ratio of the Sm, Nd, and Dy ions observed with an increase in the pH from 2.5 to 4. Furthermore, PE-PDGA more selectively adsorbs rare earth metals, such as Sm, Nd, and Dy, than other metals, such as Cu, Zn, and Co, in the pH range of 2.5−4; 73 mg Sm was adsorbed on 1 g PE-PDGA at an initial metal concentration of 100 ppm at pH 3, while Co was not adsorbed on PE-PDGA in the initial metal concentration range of 10 to 100 ppm. Thus, PE-PDGA showed high selectivity toward rare earth metals, and Sm and Co could be separated effectively.

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“…Inspired by these work, many research had been focused on DGA modified materials for the selective adsorption of REEs [17][18][19][20]. However, adsorption capacity is not very satisfactory due to only one chelating functionality per anchoring molecule is incorporated at the surface, providing limited surface functional group density.…”

Section: Introductionmentioning

confidence: 99%

Preparation of diglycolamide polymer modified silica and its application as adsorbent for rare earth ions

Liu

Gong

2019

Designed Monomers and Polymers

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Three novel diglycolamide monomers were synthesized and polymerized on silica. The diglycolamide polymer grafted silica were used as adsorbents for rare earth ions. The effects of acid concentration, structure of monomer, initial solution concentration, contact time and coexisting ions on adsorption of rare earth ions were investigated in detail. It was shown that the adsorption capacity increased with increasing acid concentration. Three adsorbents exhibited selectivity for middle and heavy rare earth over light rare earth in different extent. The adsorbent prepared from the monomer having the largest alkyl substituent showed the lowest adsorption capacity but the highest selectivity for different rare earth elements (REEs). Adsorption data were well fitted to the Langmuir isotherm and pseudo-second-order models. The presence of high concentrations (100 fold) of coexisting metal ions, K(I), Cr(II), Cu(II) or Fe(III), does not decrease the adsorption for rare earth ions seriously.

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Diglycolamic Acid–Grafted Film-Type Adsorbent for Selective Recovery of Rare Earth Elements

Cited by 8 publications

References 18 publications

Extraction and recovery of rare earths by chelating phenolic copolymers bearing diglycolamic acid or diglycolamide moieties

Extraction and recovery of rare earths by chelating phenolic copolymers bearing diglycolamic acid or diglycolamide moieties

Poly(vinyl diglycolic acid ester)-Grafted Polyethylene/Polypropylene Fiber Adsorbent for Selective Recovery of Samarium

Preparation of diglycolamide polymer modified silica and its application as adsorbent for rare earth ions

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