Fe(III)-montmorillonite: Basic properties and diffusion of tracers relevant to alteration of bentonite in deep geological disposal

Manjanna, J.; Kozaki, Tamotsu; Sato, Shunsuke

doi:10.1016/j.clay.2008.09.007

Cited by 56 publications

(22 citation statements)

References 45 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Small changes in methylene blue adsorption and cation exchange capacity were found when Fe(III)-M was compared with Na-M. The smaller value of the methylene blue adsorption, 78 (mmol/100 g), reported by Manjanna et al 10) for the same Fe(III)-mont- …”

Section: Resultsmentioning

confidence: 83%

See 1 more Smart Citation

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

Ito¹,

Miyasaka

Kozaki

et al. 2010

Journal of Nuclear Science and Technology

View full text Add to dashboard Cite

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.

show abstract

Section: Resultsmentioning

confidence: 83%

“…10) However, fundamental properties have not been fully understood yet even for Fe(III)-montmorillonite. In particular, to the author's knowledge, there is no literature available regarding the hydraulic conductivity of Fe(III)-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

View full text Add to dashboard Cite

show abstract

“…Fe-pillared montmorillonite or Fe(III) incorporated clay minerals has been extensively used in heterogeneous catalytic systems and were proved to be advantageous in both economic and environmental point of view (Vinoda and Manjanna 2014;Brigatti et al 2000). There are only a few reports on natural (Parthasarathy et al 2003;Shi et al 2011) and modified clay minerals (Manjanna et al 2009;Wu et al 2012;Vinuth et al 2015) for Cr(VI) reduction. The availability as well as the amount or access of Fe(III) ions for dye degradation was very limited.…”

mentioning

confidence: 99%

“…Hence it is important to make use of Fe(III)-Mt, i.e., the redox sensitive Fe(III) ions are placed in the interlayer of clay mineral to augment the real field applications. Recently, Manjanna et al (2009) has reported the preparation of Fe(III)-Mt and explained the basic properties along with stability. Hence, it is possible to make use of such an important redox sensitive clay mineral for the adsorption of MB dye.…”

mentioning

confidence: 99%

Environmentally benign Fe(III)–montmorillonite for rapid adsorption of methylene blue dye in aqueous medium under ambient conditions

et al. 2017

View full text Add to dashboard Cite

Herein we have explored the highly efficient and environmentally benign clay mineral, Fe(III)–montmorillonite [Fe(III)–Mt], for adsorption of methylene blue (MB) dye from aqueous solution under ambient conditions. The Fe(III)–Mt was interacted with MB dye solution at different pH, temperature and solid-to-liquid ratio. The concentration of MB dye removal was estimated from its optical density at λmax = 665 nm using UV–Vis spectrophotometer. The MB dye removal was rapid at basic pH and increases with temperature up to 40 °C. A complete reduction (100%) was occurred in about 7 min at pH 7 and 10 while at pH 3 in about 10 min. The time taken for complete reduction at 0, 30 and 40 °C are 10, 7 and 5 min respectively. The removal followed by adsorption of dye molecules on the spent clay mineral was evident from FESEM/EDX analysis. More importantly, Fe(III)–Mt could be separated and retrieved easily after the reaction by centrifugation from the degraded MB dye solution. The experimental results of MB dye removal from Fe(III)–Mt follows the pseudo first order kinetics. This study reveals that Fe(III)–Mt has the potential to be used as reductant/adsorbant to remove cationic pollutants effectively and rapidly from drinking water and large scale of industrial wastewater.

show abstract

“…Transport of dissolved ions through electrically charged porous media is of central importance for a wide range of industrial applications, such as the development of electrically triggered hydrogels [1], the assessment of the corrosion susceptibility of steel-reinforced concrete structures due to chloride ingress [2], different aspects of bone tissue engineering [3,4], or assessment of clays in terms of their suitability as lining material for nuclear waste disposal sites [5,6,7,8]. Due to the lack of significant pressure gradients, the contribution of advective transport to the aforementioned problems can usually be neglected, highlighting diffusion and electromigration as the sole relevant transport mechanisms.…”

Section: Introductionmentioning

confidence: 99%