Characterization of Fe-montmorillonite: A Simulant of Buffer Materials Accommodating Overpack Corrosion Product.

Kozai, Naofumi; Adachi, Y.; Kawamura, Sachi; Inada, K.; Kozaki, Tamotsu; Sato, Shunsuke; Ôhashi, Hiroshi; Ohnuki, Toshihiko; Banba, Tsunetaka

doi:10.3327/jnst.38.1141

Cited by 14 publications

(7 citation statements)

References 7 publications

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“…The basal lattice spacing of montmorillonite in the original Nabentonite was observed to be 1.26 nm, which is consistent with other data found in literature for Na-montmorillonite (e.g. [15]). The treatment with acetone did not change the basal lattice spacing of the montmorillonite (Figure 1b), but the relative intensity of the main peak decreased and small new peaks arose.…”

Section: Resultssupporting

confidence: 91%

“…When an aqueous solution of an Fe-salt is stirred with montmorillonite suspension in the presence of air to exchange the cation in the interlayer space, Fe III -oxyhydroxides or oxides could be formed, at least partially when the starting Fe-salt contains Fe II (e.g. [3,5,[12][13][14][15][16]). Li et al [16] have reported simple preparation of 1,1-diacetates using Fe IIImontmorillonite derived from K10 montmorillonite, but the structure of the catalyst was not examined.…”

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confidence: 99%

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Effect of FeCl3 and acetone on the structure of Na–montmorillonite studied by Mössbauer and XRD measurements

et al. 2006

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57 Fe Mö ssbauer spectroscopy, X-ray diffraction, X-ray fluorescence spectroscopy and infrared spectroscopy were used to study the effect of FeCl 3 and acetone on the structure of a Na-bentonite. XRD indicated the incorporation of Fe 3+ ions into the interlayer space since the basal lattice spacing of montmorillonite increased to 1.6 from 1.24 nm after treatment with FeCl 3 dissolved in acetone. Interlayer Na + ions could be exchanged to Fe 3+ . Magnetically split Mö ssbauer subspectra with internal magnetic fields 41 and 46 T at 74 K, were associated with two main Fe 3+ microenvironments within the interlayer regions. The resultant Femontmorillonite was successfully applied as a catalyst in the preparation of 1,1-diacetates from aromatic aldehydes and acetic acid anhydride.

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Section: Resultssupporting

confidence: 91%

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confidence: 99%

Effect of FeCl3 and acetone on the structure of Na–montmorillonite studied by Mössbauer and XRD measurements

et al. 2006

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“…Kozai et al reported the preparation methods of Fe(II)-montmorillonite by ion exchange treatment, in which pure Na-montmorillonite was suspended in FeCl 2 solution under an Ar gas atmosphere in a glove box. 7,8) Although this method was improved by introducing a Fe(II)-NTA (Fe(II)-nitrilotriacetate complex) instead of FeCl 2 , 9) there are still difficulties in preparing a certain amount of Fe(II)-montmorillonite for tracer diffusion or hydraulic conductivity measÓAtomic Energy Society of Japan urements. In addition, since Fe(II)-montmorillonite can be easily oxidized under atmospheric condition, strict control of oxygen concentration is required in the experiments using Fe(II)-montmorillonite.…”

Section: Introductionmentioning

confidence: 99%

A Study on Hydraulic Properties of Compacted Fe(III)-montmorillonite

Ito¹,

Miyasaka

Kozaki

et al. 2010

Journal of Nuclear Science and Technology

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Hydraulic conductivities were determined for compacted Fe(III)-montmorillonite sample. The Fe(III)-montmorillonite sample used in this study, which was prepared by the ion-exchange treatment of Namontmorillonite in FeCl 3 solution, contains less than 20% of Na þ ions as exchangeable cations and negligibly small amounts of iron precipitates. The measured hydraulic conductivities of compacted Fe(III)-montmorillonite were determined to be the order of 10 À9 , 10 À11 , and 10 À13 m s À1 at dry densities of 0.80, 1.01, and 1.20 Mg m À3 , respectively. These values were found to be kept constant during the experimental period, suggesting no significant change in the physicochemical properties of Fe(III)-montmorillonite during the experiment. When compared with Na-montmorillonite, remarkably high values of hydraulic conductivities were found for Fe(III)-montmorillonite at the dry densities of 0.8 and 1.0 Mg m À3 . On the other hand, almost the same value of hydraulic conductivity was obtained at the dry density around 1.2 Mg m À3 . This different effect of exchangeable cations on the hydraulic conductivity of montmorillonite could be attributed to the different sizes of macropores in compacted montmorillonite and/or the different thicknesses of electrical double layers formed over montmorillonite sheets.

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“…It was observed that the surface of FeOOH is positively charged at a lower pH as its pH ZPC is around 7.3 18) resulting in a very high sorption of oxy anions at a lower pH. 19) In this case, Sb(III) undergoes a higher sorption on the -OH functional group of the CS surface at pH 2.8. 18) Sorption of Sb(III) on the CS surface involved two mechanisms.…”

Section: Mechanism Of Sb(iii) Adsorption On Fementioning

confidence: 99%

Studies on Sorption of Antimony on Carbon Steel Surface in Chemical Decontamination Medium

Mittal¹,

Bera²,

Velmurugan³

et al. 2011

J. Nucl. Sci. Technol.

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Antimony(III) in a mixed solution of nitrilo tri acetic acid, ascorbic acid, and citric acid, known as a chemical decontamination solution, was found to be deposited on a carbon steel (CS) surface under deaerated condition. The deposited antimony on the CS surface was characterized by X-ray photoelectron spectroscopy and X-ray diffraction technique. The deposited material was found to contain elemental Sb and the Fe-Sb-O compound. The characterization results showed the initial adsorption of Sb on CS and the subsequent surface precipitation of the Fe-Sb-O compound. A commercial organic inhibitor Rodine 92B was used to stop the initial adsorption of Sb(III) and further growth of the Fe-Sb-O compound on the CS surface. Nitrogen in the inhibitor was observed to act as the bridging agent between Fe and the inhibitor for growing a layer of the inhibitor that stopped the adsorption of Sb. The work has direct relevance to nuclear reactors in terms of prevention of deposition of radioactive antimony on CS surfaces during chemical decontamination.

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Characterization of Fe-montmorillonite: A Simulant of Buffer Materials Accommodating Overpack Corrosion Product.

Cited by 14 publications

References 7 publications

Effect of FeCl3 and acetone on the structure of Na–montmorillonite studied by Mössbauer and XRD measurements

Effect of FeCl3 and acetone on the structure of Na–montmorillonite studied by Mössbauer and XRD measurements

A Study on Hydraulic Properties of Compacted Fe(III)-montmorillonite

Studies on Sorption of Antimony on Carbon Steel Surface in Chemical Decontamination Medium

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