Uptake of Europium(III) from Water using Magnetite Nanoparticles

Carvalho, Rui S.; Daniel‐da‐Silva, Ana L.; Trindade, Tito

doi:10.1002/ppsc.201500170

Cited by 24 publications

(6 citation statements)

References 69 publications

(104 reference statements)

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“…The application of magnetic nanosorbents for the removal of herbicides remains a less explored area in the context of water purification. Our research group has reported a range of magnetic nanosorbents that are effective for the removal of distinct water pollutants, using magnetically-assisted procedures [ 26 , 27 , 28 , 29 , 30 , 31 ]. In particular, nanosorbents composed of magnetic cores and biopolymers at the surface are promising candidates for the removal of certain emerging organic pollutants from water, using magnetically-assisted technologies [ 32 , 33 , 34 ].…”

Section: Introductionmentioning

confidence: 99%

Magnetic Hybrid Nanosorbents for the Uptake of Paraquat from Water

et al. 2017

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Although paraquat has been banned in European countries, this herbicide is still used all over the world, thanks to its low-cost, high-efficiency, and fast action. Because paraquat is highly toxic to humans and animals, there is interest in mitigating the consequences of its use, namely by implementing removal procedures capable of curbing its environmental and health risks. This research describes new magnetic nanosorbents composed of magnetite cores functionalized with bio-hybrid siliceous shells, that can be used to uptake paraquat from water using magnetically-assisted procedures. The biopolymers κ-carrageenan and starch were introduced into the siliceous shells, resulting in two hybrid materials, Fe3O4@SiO2/SiCRG and Fe3O4@SiO2/SiStarch, respectively, that exhibit a distinct surface chemistry. The Fe3O4@SiO2/SiCRG biosorbents displayed a superior paraquat removal performance, with a good fitting to the Langmuir and Toth isotherm models. The maximum adsorption capacity of paraquat for Fe3O4@SiO2/SiCRG biosorbents was 257 mg·g−1, which places this sorbent among the best systems for the removal of this herbicide from water. The interesting performance of the κ-carrageenan hybrid, along with its magnetic properties and good regeneration capacity, presents a very efficient way for the remediation of water contaminated with paraquat.

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Section: Introductionmentioning

confidence: 99%

Magnetic Hybrid Nanosorbents for the Uptake of Paraquat from Water

et al. 2017

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“…The fate of Ce(III) during the preparation of GR and magnetite from preformed ferrihydrite has been investigated by Nedel et al Ce(III) initially retained by ferrihydrite was only partially released upon phase transformation to magnetite but was quantitatively released upon transformation of ferrihydrite to GR. Separately, studies indicate that preformed magnetite has a high affinity for sorption of Ln(III). − However, no study reported structural data by directly probing the retained Ln(III) species.…”

Section: Introductionmentioning

confidence: 99%

Trivalent Actinide Uptake by Iron (Hydr)oxides

Finck

Nedel

Dideriksen

et al. 2016

Environ. Sci. Technol.

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The retention of Am(III) by coprecipitation with or adsorption onto preformed magnetite was investigated by X-ray diffraction (XRD), solution chemistry, and X-ray absorption spectroscopy (XAS). In the coprecipitation experiment, XAS data indicated the presence of seven O atoms at 2.44(1) Å, and can be explained by an Am incorporation at Fe structural sites at the magnetite surface. Next-nearest Fe were detected at distances suggesting that Am and Fe polyhedra share corners in geometries ranging from bent to close to linear Am-O-Fe bonds. After aging for two years, the coordination number and the distance to the first O shell significantly decreased, and atomic shells were detected at higher distances. These data suggest a structural reorganization and an increase in structural order around sorbed Am. Upon contact with preformed FeO, Am(III) forms surface complexes with cosorbed Fe at the surface of magnetite, a possible consequence of the high concentration of dissolved Fe. In a separate experiment, chloride green rust (GR) was synthesized in the presence of Am(III), and subsequently converted to Fe(OH)(s) intermixed with magnetite. XAS data indicated that the actinide is successively located first at octahedral brucite-like sites in the GR precursor, then in Fe(OH)(s), an environment markedly distinct from that of Am(III) in FeO. The findings indicate that the magnetite formation pathway dictates the magnitude of Am(III) incorporation within this solid.

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“…A comparison study of Eu( iii ) adsorption was conducted with four different types of magnetic adsorbent materials including bare magnetite (Fe 3 O 4 ), silica-coated magnetite (Fe 3 O 4 @SiO 2 ), and silica-coated magnetite with surfaces functionalized with amine groups (Fe 3 O 4 @SiO 2 /APMS) and dithiocarbamate groups (Fe 3 O 4 @SiO 2 /DTC). 42 As a result of subsequent modification, the net surface charge was significantly varied from 2.2 to −44 mV. These materials adsorbed Eu in the order of Fe 3 O 4 @SiO 2 ≈ Fe 3 O 4 @SiO 2 /APMS > Fe 3 O 4 > Fe 3 O 4 @SiO 2 /DTC at pH 7 in DI water; higher adsorption was due to the preferred coordination of Eu( iii ) with the O donors.…”

Section: Classification Of Magnetite-based Adsorbentsmentioning

confidence: 94%

“…Silica coating can be achieved through Stober process via sol-gel reaction which involves the use of tetraethyl orthosilicate (TEOS) in acidic and/or basic pH conditions under vacuum. Several works have been reported in the literatures demonstrating the effective use of silica protected m-NPs graed with various functional groups for the removal of radionuclides, 42,44 . However, the -Si-O-Si-bond in silica coating is susceptible to rapid degradation in basic conditions resulting in signicant loss of surface-graed functional groups.…”

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confidence: 99%

Magnetite-based adsorbents for sequestration of radionuclides: a review

Husnain

Woojin-Lee

et al. 2018

RSC Adv.

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As a result of extensive research efforts by several research groups, magnetite-based materials have gained enormous attention in diverse fields including biomedicine, catalysis, energy and data storage devices, magnetic resonance imaging, and environmental remediation. Owing to their low production cost, ease of modification, biocompatibility, and superparamagnetism, the use of these materials for the abatement of environmental toxicants has been increasing continuously. Here we focus on the recent advances in the use of magnetite-based adsorbents for removal of radionuclides (such as 137 Cs(I), 155 Eu(III), 90 Sr(II), 238 U(VI), etc.) from diverse aqueous phases. This review summarizes the preparation and surface modification of magnetite-based adsorbents, their physicochemical properties, adsorption behavior and mechanism, and diverse conventional and recent environmental technological options for the treatment of water contaminated with radionuclides. In addition, case studies for the removal of radionuclides from actual contaminated sites are discussed, and finally the optimization of magnetite-based remedial solutions is presented for practical application.

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Uptake of Europium(III) from Water using Magnetite Nanoparticles

Cited by 24 publications

References 69 publications

Magnetic Hybrid Nanosorbents for the Uptake of Paraquat from Water

Magnetic Hybrid Nanosorbents for the Uptake of Paraquat from Water

Trivalent Actinide Uptake by Iron (Hydr)oxides

Magnetite-based adsorbents for sequestration of radionuclides: a review

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