Adsorptive separation of La, Ce and Pr using microcapsules containing 2-ethylhexylphosphonic acid mono-2-ethylhexyl ester

Kondo, Kazuo; Matsuo, Tomohiro; Matsumoto, Michiaki

doi:10.1016/j.hydromet.2015.01.004

Cited by 19 publications

(12 citation statements)

References 19 publications

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“…Other groups reported higher adsorption capacities for lanthanide extraction by different sorbent materials: Liao et al 70 mg La /g NP for citrate coated magnetic nanoparticles [25]; Kondo et al 230 mg La /g MC using microcapsules containing 2-ethylhexylphosphonic acid mono-2-ethylhexyl ester [26]; Wu et al 55.9 mg La /g NP using 2-ethylhexyl phosphonic acid mono-2-ethylhexyl ester-grafted magnetic silica nanocomposites [27]; Awwad et al found 175.4 mg La /g and 250 mg Er /g of activated carbon [28]; Dupont et al have found in the literature several values for gadolinium uptake, such as 14 mg Gd /g NP of Fe 3 O 4 , 20 mg Gd /g NP of SiO 2 , 41 mg Gd /g NP of TiO 2 , and 113 mg Gd /g NP of Fe 3 O 4 (TMS-EDTA), among others [29]. …”

Section: Resultsmentioning

confidence: 99%

Lanthanide sorbent based on magnetite nanoparticles functionalized with organophosphorus extractants

Basualto

Gaete

Molina

et al. 2015

Science and Technology of Advanced Materials

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In this work, an adsorbent was prepared based on the attachment of organophosphorus acid extractants, namely, D2EHPA, CYANEX 272, and CYANEX 301, to the surface of superparamagnetic magnetite (Fe3O4) nanoparticles. The synthesized nanoparticles were coated with oleic acid, first by a chemisorption mechanism and later by the respective extractant via physical adsorption. The obtained core–shell functionalized magnetite nanoparticle composites were characterized by dynamic light scattering, scanning electron microscopy, transmission electron microscopy, thermogravimetry, infrared absorption and vibrating sample magnetometry. All the prepared nanoparticles exhibited a high saturation magnetization capacity that varied between 72 and 46 emu g−1 and decreased as the magnetite nanoparticle was coated with oleic acid and functionalized. The scope of this study also included adsorption tests for lanthanum, cerium, praseodymium, and neodymium and the corresponding analysis of their results. Sorption tests indicated that the functionalized nanoparticles were able to extract the four studied lanthanide metal ions, although the best extraction performance was observed when the sorbent was functionalized with CYANEX 272, which resulted in a loading capacity of approximately 12–14 mgLa/gMNP. The magnetization of the synthesized nanoparticles was verified during the separation of the lanthanide-loaded sorbent from the raffinate by using a conventional magnet.

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Section: Resultsmentioning

confidence: 99%

Lanthanide sorbent based on magnetite nanoparticles functionalized with organophosphorus extractants

Basualto

Gaete

Molina

et al. 2015

Science and Technology of Advanced Materials

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“…Rejections of the major elements decreased from 99% to 70-80% for the metal species (Al, Ca, Cu and Zn) and 12 slightly diminished for sulphur from 40 to 30%. These differences could be attributed to the fact that membrane 13 aged in 1 M sulphuric acid suffered both physical and chemical modifications in such strong acidic conditions.…”

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confidence: 91%

“…Traditional solutions to treat AMD for metal recovery are: a) neutralisation to precipitate metals as hydroxides 5 and sulphate as gypsum [7,8]; and b) biological processing using sulphate-reducing bacteria under anaerobic 6 conditions, leading to the precipitation of metal sulphides [9,10]. Technologies such as adsorption [11,12] and 7…”

Section: Introductionmentioning

confidence: 99%

“…The application of NF membranes to treat AMD has been previously explored. Published studies reported high 12 metal rejection rates (>85%) and high acid permeation through the membrane [15][16][17][18][19][20]. Moreover, it has been 13 observed that higher sulphuric acid concentrations (i.e.…”

Section: Introductionmentioning

confidence: 99%

“…Recently, Fernández et al [41] have postulated 11 potential piperazine groups and their theoretically calculated pK a values. Accordingly, the acid-base membrane 12 properties could be defined by eq. 5-6: 13…”

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confidence: 99%

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Application of nanofiltration for acidic waters containing rare earth elements: Influence of transition elements, acidity and membrane stability

et al. 2018

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14Acid mine drainage (AMD) is considered the main environmental problem in mining operation due to its acidity, 15 metal content (Fe, Al, Zn, Cu) and onerous associated treatment cost. However, the presence of relatively high 16 levels of added value elements (rare earth elements (REE)) could make its valorisation economically affordable. 17Membrane nanofiltration (NF) has been postulated as a potential recovery technology because it allows the 18 recovery of a sulphuric acid rich stream and a metal rich stream in one step. In this study, the performance of a 19 semi-aromatic polyamide NF membrane (NF270) in filtering model solutions containing common metals (Ca, Al, 20 Zn) in sulphuric solutions (pH 1.5-3.0) was evaluated. In a second stage, the performance was assessed with the 21 same model solutions but also containing REE. NF270 showed high rejections for metallic ions in solution, 22allowing acid permeation. Ion rejection data were used to determine membrane permeances to ions using the 23 solution-diffusion model considering reactive transport. The stability of the membrane was also studied by 24 comparing performances of a virgin membrane with an aged membrane exposed to 1 M sulphuric acid for 4 25 weeks. Physicochemical changes of membrane properties after ageing were also analysed by ATR-FTIR, AFM and 26 XPS. 27 28

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Immobilization of chitosan nanolayers on the surface of nano-titanium oxide as a novel nanocomposite for efficient removal of La(III) from water

Mahmoud

Ali

Nassar

et al. 2017

International Journal of Biological Macromolecules

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Adsorptive separation of La, Ce and Pr using microcapsules containing 2-ethylhexylphosphonic acid mono-2-ethylhexyl ester

Cited by 19 publications

References 19 publications

Lanthanide sorbent based on magnetite nanoparticles functionalized with organophosphorus extractants

Lanthanide sorbent based on magnetite nanoparticles functionalized with organophosphorus extractants

Application of nanofiltration for acidic waters containing rare earth elements: Influence of transition elements, acidity and membrane stability

Immobilization of chitosan nanolayers on the surface of nano-titanium oxide as a novel nanocomposite for efficient removal of La(III) from water

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