Synthesis of superparamagnetic δ-FeOOH nanoparticles by a chemical method

Nishida, Naoki; Amagasa, Shota; Kobayashi, Yoshio; Yamada, Yasuhiro

doi:10.1016/j.apsusc.2016.06.179

Cited by 25 publications

(13 citation statements)

References 15 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Besides, the spectrum of 2-line ferrihydrite can be fitted by one hyperfine field with a much smaller field strength (378 kOe) and asymmetrical broad lines resulting in weaker magnetic interactions than for SSI in agreement with its lower magnetic ordering and poor crystallinity. In the spectrum of synthetic feroxyhite, one of the fitted hyperfine fields in feroxyhite is distinctly higher than 500 kOe, which is consistent with other studies [60][61][62][63][64] . On the contrary, the three fitted hyperfine fields of SSI are all lower than 500 kOe.…”

Section: Mössbauer Spectroscopysupporting

confidence: 91%

Structure of single sheet iron oxides produced from surfactant interlayered green rusts

Yin

Dideriksen

Abdelmoula

et al. 2019

Applied Clay Science

View full text Add to dashboard Cite

Two-dimensional (2D) single sheets formed via delamination of Layered Double Hydroxides (LDHs) are of great interest because of their high reactive surface area and unique chemical and physical properties. Here, we focus on formation and properties of single sheet iron oxides (SSI) that may be used as sorbents, electro-and photocatalysts. We have developed a method for synthesis of SSIs from the Fe II -Fe III LDH (green rust, GR) using surfactant intercalation of preformed GR, followed by aerial oxidation and delamination. The average height of the SSIs from AFM is 1 nm and the lateral dimensions vary from 20 to 100 nm. Selected area electron diffraction of SSI shows a hexagonal pattern with d ≈ 0.28 nm consistent with diffraction along [001] in metal hydroxide layers in GR. Chemical analysis, thermogravimetric analysis and X-ray photoelectron spectra analysis lead to SSI formula of FeO 0.82 (OH) 1.38 • 0.7H 2 O. For the oxidized, surfactantintercalated GR and SSI, pair distribution functions from high energy X-ray scattering data demonstrate that two distinct interatomic distances exist for first neighbor Fe-Fe pairs, somewhat similar to the patterns for ferrihydrite and goethite, but in contrast to the single Fe-Fe distance observed for the unoxidized GR. A modeled structural rearrangement with vertical displacements of Fe atoms from the original hydroxide layer to form a trilayer with Fe polyhedra that are linked via both corner-and edge-sharing produced a PDF in agreement with the main features of the measured pattern. Mössbauer spectroscopy shows that the SSI orders magnetically at 130 K and that the hyperfine parameters are distinct for SSI and different from other iron oxides such as ferrihydrite and feroxyhite. The synthesis pathway via GR C12 is critical for formation of SSI as the "insolating" C12 interlayer hinders bonding and polymerization between Fe III -O/OH octahedra across interlayers during oxidation and thus only structural reorganisations of single brucitic Fe II -Fe III hydroxide layers can take place during oxidation with no possibilities for nucleation of iron oxides with higher crystallinity like goethite. The strong increase of single-and double coordinated O/OH groups in the SSI compared with the parent GRs predicts a high reactivity of SSI as surface complexation sorbents.

show abstract

Section: Mössbauer Spectroscopysupporting

confidence: 91%

Structure of single sheet iron oxides produced from surfactant interlayered green rusts

Yin

Dideriksen

Abdelmoula

et al. 2019

Applied Clay Science

View full text Add to dashboard Cite

show abstract

“…The room-temperature Mössbauer spectrum of sample S3Gly consists of an inner doublet D1 due to the high spin Fe(III) and/or superparamagnetic particles and an outer doublet D3 due to Fe(II) present in Fe(OH)2 and GR(CO3 2-). The "magnetic singlet" component (symbolized with R) is introduced to improve the fitting [34]. The amount of Fe(II) in sample S3Gly is estimated to 9.9 % on the basis of the relative area of outer doublet D3.…”

Section: Resultsmentioning

confidence: 99%

“…It has been shown that humic substances highly reduced the -FeOOH mean size and enhanced its colloidal stability in salt solutions. Nishida et al [34] synthesized superparamagnetic (10 nm in diameter) spherical -FeOOH NPs that showed increased magnetization intensity relative to that of bulk -FeOOH. It was found that -FeOOH NPs formed by oxidation of Fe3O4 and Fe(OH)2 intermediate products.…”

Section: Introductionmentioning

confidence: 99%

Characterization of radiolytically synthesized feroxyhyte and oxidized magnetite nanoparticles

Marić

Dražić

Štefanić

et al. 2020

Materials Characterization

View full text Add to dashboard Cite

“…For this reason, they showed saturation effect at lower cadmium concentration than larger one-pot synthetized PDCA-nZVI 1/1. Moreover, the coreshell structure of functionalized PDCA-nZVI materials with magnetite and feroxyhyte layers on iron surface obviously influenced the adsorption of low cadmium content in water solution [30]. This might explain the observed discrepancies in sorption of cadmium below concentration of 5 mg L -1 .…”

Section: Characterization Of Pdca-nzvi Particles From One-pot Synthesismentioning

confidence: 99%

Functionalization of nZVI nanoparticles with dipicolinic acid by one-pot synthesis and testing of PDCA-nZVI material properties in cadmium removal from water

Rončević¹,

Nemet²,

Zagorec³

et al. 2020

Preprint

View full text Add to dashboard Cite

The low-cost method of functionalization of zero-valent iron nanoparticles (nZVI) by dipicolinic acid (PDCA) by one-pot synthesis was studied in this work. The chemical reduction of iron salt with concurrent addition of ligand was performed using different molar ratio of starting reagents. Functionalization of nZVI was confirmed by FT-IR spectroscopy. The formation of oxide layers on the core of iron particles that consists of magnetite and feroxyhyte was confirmed by the XRD method. Morphology of obtained material was examined by SEM study and it revealed the formation of short-chains of spherical particles by use of equimolar ratio of reactants. The appearance of ellipsoidal aggregates was observed by use of reagents molar ratio of 1/2. The performance characteristics of obtained materials were tested in cadmium removal from water solutions. Concentrations of cadmium in solutions were determined by ICP-OES measurements. The efficiency of removal of cadmium was tested on bare nZVI particles, one-pot synthetized PDCA-nZVI particles, and particles obtained by subsequent incubation of PDCA onto nZVI. The results of the measured hydrodynamic diameter and zeta-potential in solutions were correlated with adsorption characteristics of prepared functionalized materials. The most efficient adsorption of cadmium was observed by exploiting PDCA-nZVI nanomaterial that was obtained from one-pot synthesis.

show abstract

Synthesis of superparamagnetic δ-FeOOH nanoparticles by a chemical method

Cited by 25 publications

References 15 publications

Structure of single sheet iron oxides produced from surfactant interlayered green rusts

Structure of single sheet iron oxides produced from surfactant interlayered green rusts

Characterization of radiolytically synthesized feroxyhyte and oxidized magnetite nanoparticles

Functionalization of nZVI nanoparticles with dipicolinic acid by one-pot synthesis and testing of PDCA-nZVI material properties in cadmium removal from water

Contact Info

Product

Resources

About

Synthesis of superparamagnetic δ-FeOOH nanoparticles by a chemical method

Cited by 25 publications

References 15 publications

Structure of single sheet iron oxides produced from surfactant interlayered green rusts

Structure of single sheet iron oxides produced from surfactant interlayered green rusts

Characterization of radiolytically synthesized feroxyhyte and oxidized magnetite nanoparticles

Functionalization of nZVI nanoparticles with dipicolinic acid by one-pot synthesis ­and testing of PDCA-nZVI material properties in cadmium removal from water

Contact Info

Product

Resources

About

Functionalization of nZVI nanoparticles with dipicolinic acid by one-pot synthesis and testing of PDCA-nZVI material properties in cadmium removal from water