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Matsuo, Motoyuki; Kawakami, Masayuki; Sugimori, Kenji

doi:10.1023/a:1012680325493

Cited by 9 publications

(7 citation statements)

References 4 publications

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“…10 shows the Mössbauer spectrum of 0.5Fe-0.5FeS 2 . The magnetic sextet with a hyperfine field of 260 kOe and a chemical shift of 0.66 mm/s is well expected for the antiferromagnetic FeS troilite phase [22]. A magnetic hysteresis loop is shown in Fig.…”

Section: Resultsmentioning

confidence: 52%

Synthesis of FeS2 and FeS nanoparticles by high-energy mechanical milling and mechanochemical processing

Chin

Ding

et al. 2005

Journal of Alloys and Compounds

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Section: Resultsmentioning

confidence: 52%

Synthesis of FeS2 and FeS nanoparticles by high-energy mechanical milling and mechanochemical processing

Chin

Ding

et al. 2005

Journal of Alloys and Compounds

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“…On the basis of the hyperfine Mössbauer parameters, the other two sextet components represented magnetite, a product of zero-valeniron oxidation and remaining nonreduced phase. The last singlet component in the spectrum reflected the presence of low-spin Fe(II) occupying the tetrahedral sites in a FeS system, which can be described as mackinawite-like. ,, …”

Section: Resultsmentioning

confidence: 99%

“…Iron speciation was analyzed using low-temperature (T = 150 K) 57 Fe Mossbauer spectrometer (MS2007) equipped with a 50 mCi 57 Co(Rh) source operating in a constant acceleration mode. 41,42 MossWinn software 43 was used for fitting the Mossbauer spectra.…”

Section: Methodsmentioning

confidence: 99%

Core–Shell Fe/FeS Nanoparticles with Controlled Shell Thickness for Enhanced Trichloroethylene Removal

Brumovský

Filip

Malina

et al. 2020

ACS Appl. Mater. Interfaces

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Zero-valent iron nanoparticles (nZVI) treated by reduced sulfur compounds (i.e., sulfidated nZVI, S-nZVI) have attracted increased attention as promising materials for environmental remediation. While the preparation of S-nZVI and its reactions with various groundwater contaminants such as trichloroethylene (TCE) were already a subject of several studies, nanoparticle synthesis procedures investigated so far were suited mainly for laboratory-scale preparation with only a limited possibility of easy and cost-effective large-scale production and FeS shell property control. This study presents a novel approach for synthesizing S-nZVI using commercially available nZVI particles that are treated with sodium sulfide in a concentrated slurry. This leads to S-nZVI particles that do not contain hazardous boron residues and can be easily prepared off-site. The resulting S-nZVI exhibits a core–shell structure where zero-valent iron is the dominant phase in the core, while the shell contains mostly amorphous iron sulfides. The average FeS shell thickness can be controlled by the applied sulfide concentration. Up to a 12-fold increase in the TCE removal and a 7-fold increase in the electron efficiency were observed upon amending nZVI with sulfide. Although the FeS shell thickness correlated with surface-area-normalized TCE removal rates, sulfidation negatively impacted the particle surface area, resulting in an optimal FeS shell thickness of approximately 7.3 nm. This corresponded to a particle S/Fe mass ratio of 0.0195. At all sulfide doses, the TCE degradation products were only fully dechlorinated hydrocarbons. Moreover, a nearly 100% chlorine balance was found at the end of the experiments, further confirming complete TCE degradation and the absence of chlorinated transformation products. The newly synthesized S-nZVI particles thus represent a promising remedial agent applicable at sites contaminated with TCE.

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“…In other words, the iron compounds suppress a much release of hydrogen sulfide that threatens the health of living organisms and is responsible for malodor. 23 Further investigations and continued effort are necessary for the remediation of the deteriorated environment.…”

Section: Areas Of Iron Components In the Sediment Cores Collected At mentioning

confidence: 99%

Seasonal Variation of Iron Speciation in a Pearl-Raising Bay Sediment by Mössbauer Spectroscopy

Kuno¹,

Matsuo²,

Chiba³

et al. 2008

Journal of Nuclear and Radiochemical Sciences

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Ago Bay in Mie Prefecture, central Japan, is world-famous for the site of Mikimoto pearl culture, but recently the production of pearls has considerably declined. Environmental deterioration of the bay is suspected of having caused the decline. The periodic investigation into iron speciation of the bay sediment by 57 Fe Mössbauer spectroscopy revealed its high pyrite (FeS 2 ) content from the surface to the 20-cm depth. The pyrite in the surface sediment decreased only in spring, three months after the dissolved oxygen in the bottom water was at maximum. Such oxygen-consuming material as pyrite accumulated through long-term biotic activity is a most-likely explanation for the prolonged environmental deterioration of the bay, which appears in the high chemical oxygen demand (COD) of the sediment.

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Untitled

Cited by 9 publications

References 4 publications

Synthesis of FeS2 and FeS nanoparticles by high-energy mechanical milling and mechanochemical processing

Synthesis of FeS2 and FeS nanoparticles by high-energy mechanical milling and mechanochemical processing

Core–Shell Fe/FeS Nanoparticles with Controlled Shell Thickness for Enhanced Trichloroethylene Removal

Seasonal Variation of Iron Speciation in a Pearl-Raising Bay Sediment by Mössbauer Spectroscopy

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