Modified Method for Bentonite Purification and Characterization; a Case Study Using Bentonite from Tsunagi Mine, Niigata, Japan

Hayakawa, T.; Minase, Makoto; Fujita, Ken‐ichi; Ogawa, Makoto

doi:10.1346/ccmn.2016.0640303

Cited by 17 publications

(11 citation statements)

References 50 publications

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“…This is due to what probably results from the beneficiation and purification processes, such as sieve fractionation in which a large amount of the impurities, such as quartz, feldspar, carbonates and organic matter, are eliminated. [48][49][50] PetBent also shows a typical behavior of montmorillonites, with a (001) reflection (basal reflection). A characteristic peak at 2θ = 7° also infers the possibility of being a montmorillonite.…”

Section: Preparation and Characterizations Of The Clay Mineralsmentioning

confidence: 99%

“…The elimination of impurities such as quartz produced a more pure clay mineral, which is richer in montmorillonite and more suitable for the cation exchange procedure. 49,50 Analysis of the water of the Jacarepaguá Lagoon (Rio de Janeiro, Brazil) Table 4 presents the results for the chemical analyses of some important parameters for the study of the Jacarepaguá Lagoon water and the comparison with those established in the CONAMA Resolution No. 357/2005 (Brazilian legislation).…”

Section: Phosphate Adsorption Studiesmentioning

confidence: 99%

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Phosphate Adsorption by Montmorillonites Modified with Lanthanum/Iron and a Laboratory Test using Water from the Jacarepaguá Lagoon (RJ, Brazil)

Castro

Brandão

Bertolino

et al. 2018

J. Braz. Chem. Soc.

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Montmorillonites modified with lanthanum(III) and iron(III) were prepared from two commercial clays. These materials were characterized by powder X-ray diffraction analysis, X-ray fluorescence, infrared spectroscopy, N 2 adsorption, and scanning electron microscopy. The incorporation of lanthanum(III) and iron(III) varied from 0 to 4.00%. The amount of these cations governed the adsorption capacity of the material since an increase in the percentage of La by 1.7 times improved the adsorption capacity by 3.3 times. The structural properties of the precursor clay minerals, such as pore size, may have influenced the extension of the modification process. Kinetics and equilibrium studies indicated that adsorption occurs mainly within 24 h, and the pseudo-second order and Lagmuir models described the process. The phosphate adsorption capacity ranged from 2.86 to 17.86 mg g-1 for the modified materials and was mainly dependent on the La content. A laboratory test with a natural water sample from the Jacarepaguá Lagoon showed reduction of the soluble reactive phosphorus concentration from 0.41 to 0.04 mg L-1 , for the material with 4.00% La 2 O 3. The materials described in this work were effective for the reduction of the soluble reactive phosphate, contributing to the research of a national product destined to the restoration of eutrophic aquatic environments.

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Section: Preparation and Characterizations Of The Clay Mineralsmentioning

confidence: 99%

Section: Phosphate Adsorption Studiesmentioning

confidence: 99%

Phosphate Adsorption by Montmorillonites Modified with Lanthanum/Iron and a Laboratory Test using Water from the Jacarepaguá Lagoon (RJ, Brazil)

Castro

Brandão

Bertolino

et al. 2018

J. Braz. Chem. Soc.

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show abstract

“…The XRD pattern revealed that Na-exchange had been successfully performed since the position of the 001 smectite peak in all the investigated samples corresponded to the Na-forms of smectite with d 001 at around 1.2-1.3 nm. 30 The raw bentonites from Texas and Bogovina were dominantly smectites of the Ca--type with characteristic basal spacing of d 001 = 1.5 nm.…”

Section: X-ray Powder Diffractionmentioning

confidence: 99%

Adsorption of strontium on different sodium-enriched bentonites

Marinović¹,

Ajduković²,

Jović-Jovičić³

et al. 2017

JSCS

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Bentonites from three different deposits (Wyoming, TX, USA and Bogovina, Serbia) with similar cation exchange capacities were sodium enriched and tested as adsorbents for Sr 2+ in aqueous solutions. X-Ray diffraction analysis confirmed successful Na-exchange. The textural properties of the bentonite samples were determined using low-temperature the nitrogen physisorption method. Significant differences in the textural properties between the different sodium enriched bentonites were found. Adsorption was investigated with respect to adsorbent dosage, pH, contact time and the initial concentration of Sr 2+. The adsorption capacity increased with pH. In the pH range from 4.0-8.5, the amount of adsorbed Sr 2+ was almost constant but 2-3 times smaller than at pH ≈11. Further experiments were performed at the unadjusted pH since extreme alkaline conditions are environmentally hostile and inapplicable in real systems. The adsorption capacity of all the investigated adsorbents toward Sr 2+ was similar under the investigated conditions, regardless of significant differences in the specific surface areas. It was shown and confirmed by the Dubinin-Radushkevich model that the cation exchange mechanism was the dominant mechanism of Sr 2+ adsorption. Their developed microporous structures contributed to the Sr 2+ adsorption process. The adsorption kinetics obeyed the pseudo-second-order model. The isotherm data were best fitted with the Langmuir isotherm model.

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“…Copyright 2008 American Chemical Society known to affect the properties of the organophilic clays. Purification and classification are possible for bentonite to lead optimized materials performance in the application of organophilic bentonites [35].…”

Section: Electrostatic Interactionsmentioning

confidence: 99%

Inorganic–Organic Interactions

Okada

Ogawa

2017

Nanostructure Science and Technology

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Intercalation of guest species into layered materials is a way of constructing two-dimensionally ordered inorganic-organic molecular or supramolecular or hybrid assembly with unique microstructures controlled by host-guest and guestguest interactions [1][2][3][4][5][6][7][8][9]. One of the most unique characteristics of intercalation chemistry is the expansion of the interlayer space upon intercalation of guest species. The expanded interlayer space by the intercalation can be used to immobilize guest species further, since the space was geometrically and chemically modified to accommodate wider variety of guest species. This 'expandable' 2-dimensional nano-space is useful as a nano-vessel or nano-reaction environment for immobilizing various kinds of molecular functional species.The properties of intercalation compounds are largely affected by the population (or density or distance between adjacent species) of functional units and some useful functions are emerged only when appropriate population (nanostructure) is achieved. The interactions between host and guest have been investigated based on the structural consideration of resulting intercalation compounds (or interlayer microstructures). The characterization includes X-ray and electron diffraction and composition, chemical bonding between host and guest using vibrational spectroscopy, electronic states of the confined guests by electronic spectroscopy, strength of interactions using thermal analyses (desorption and decomposition), and more directly using advanced microscopies.

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Modified Method for Bentonite Purification and Characterization; a Case Study Using Bentonite from Tsunagi Mine, Niigata, Japan

Cited by 17 publications

References 50 publications

Phosphate Adsorption by Montmorillonites Modified with Lanthanum/Iron and a Laboratory Test using Water from the Jacarepaguá Lagoon (RJ, Brazil)

Phosphate Adsorption by Montmorillonites Modified with Lanthanum/Iron and a Laboratory Test using Water from the Jacarepaguá Lagoon (RJ, Brazil)

Adsorption of strontium on different sodium-enriched bentonites

Inorganic–Organic Interactions

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