Journal of the Clay Science Society of Japan (in Japanese)
Online ISSN : 2186-3563
Print ISSN : 0470-6455
ISSN-L : 0470-6455
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Volume 35, Issue 3
Displaying 1-4 of 4 articles from this issue
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  • Progress of Hydrothermal Chemistry
    Nakamichi YAMASAKI
    1995 Volume 35 Issue 3 Pages 93-99
    Published: December 28, 1995
    Released on J-STAGE: September 20, 2011
    DOIhttps://doi.org/10.11362/jcssjnendokagaku1961.35.93
    JOURNAL FREE ACCESS
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  • X-Ray Photoelectron Spectroscopy, NMR, and Secondary Ion Mass Spectrometry of Clay Minerals
    Mitsuyuki SOMA, Haruhiko SEYAMA
    1995 Volume 35 Issue 3 Pages 100-107
    Published: December 28, 1995
    Released on J-STAGE: September 20, 2011
    DOIhttps://doi.org/10.11362/jcssjnendokagaku1961.35.100
    JOURNAL FREE ACCESS
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    Chemical bonding state analysis, surface analysis and microscopic analysis of clay minerals by X-ray photoelectron spectroscopy (XPS), NMR and secondary ion mass specrometry (SIMS) have been reviewed. Examples of application include chemical bonding characterization of exchangeable and nonexchangeable cations, coordination around organotin cations in hectorite interlayer, surface composition of halloysite with different morphology, and depth profiling of acid-leached layers of biotite.
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  • Reactions of Phosphate with Soil Colloids
    Masami NANZYO
    1995 Volume 35 Issue 3 Pages 108-119
    Published: December 28, 1995
    Released on J-STAGE: September 20, 2011
    DOIhttps://doi.org/10.11362/jcssjnendokagaku1961.35.108
    JOURNAL FREE ACCESS
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    Phosphate is highly reactive with soil constituents in various mechanisms. Due to these reactions, a large excess of phosphorus fertilizers are applied to agricultural fields as compared with the amount of phosphate uptake by crops. This paper outlines the reactions of phosphate with different soil colloids.
    Phosphate reacts with goethite forming a binuclear surface complex under acid to alkaline conditions. Phosphate reacts similarly with noncrystalline hydrous iron oxide under alkaline conditions. However, under the acidic conditions, the reaction product is partly converted into noncrystalline iron phosphate. In contrast, phosphate reacts with noncrystalline aluminum hydroxide, allophanic clays, and Andisols to give a material close to noncrystalline aluminum phosphate at wide pH range.
    Although silicate layers of 2: 1 layer silicate minerals hardly react with phosphate, exchangeable Al, Ca and Mg react with phosphate depending on the reaction conditions. HPO2-4is highly reactive with exchangeable Al than with Al-humus complex and ferrihydrite. On the other hand, H2PO-4 is more reactive with Al-humus and ferrihydrite than with exchangeable Al. The exchangeable Ca and Mg held by layer silicate minerals react with ammonium phosphate to give CaHPO4· 2H20 and MgNH4PO4·6H20, respectively at pH 7.0. However, the exchangeable Ca and Mg in Andisols do not give CaHPO4·2H20 and MgNH4PO4·6H20 under the same conditions, possibly due to the high affinity of Ca2+ and Mg2+ for phosphated Andisols.
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  • A Chiral Metal Chelate as a Molecular Probe to Study the Intermolecular Interactions on a Clay Surface: Theoretical and Experimental Approach
    Hisako SATO, Masahiro TANIGUCHI, Akihiko YAMAGISHI
    1995 Volume 35 Issue 3 Pages 120-128
    Published: December 28, 1995
    Released on J-STAGE: September 20, 2011
    DOIhttps://doi.org/10.11362/jcssjnendokagaku1961.35.120
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    The adsorption of tris (1, 10-phenanthroline)-metal (II) chelate by saponite clay has been simulated by the Monte Carlo method. A two-dimensional sheet of linked [SiO4] 4-and [Al04] 5-tetrahedra was used for the silicate sheet model. The effective charges of silicate clusters and metal chelates were calculated by the ab initio MO method. The thermal distributions of the configurations were obtained using Metropolis algorithm. For the adsorption within the cation exchange capacity (CEC), the interlayer distance at the thermal equilibrium was obtained to be 10.5 Å for both the racemic and enantiomeric chelates. For the adsorption over the CEC, the interlayer distance was 19.5 Å and 20.8 Å for the racemic and enantiomeric chelates in the presence of SO42- anions, respectively. These predictions were compared with the experimental observation of adsorption of [Ru (phen) 3] SO4 by colloidally dispersed synthetic saponite. The present simulations described correctly the intercalation behaviors of [Ru (phen) 3] SO4 by saponite clays under the very high concentration of free chelates. The Monte Carlo simulations were also applied to predict the adsorption structures of 1, 1'-binaphthol on a hectorite column exchanged by Λ-[Ru (bpy) 3] 2+ or Λ-[Ru (phen) 3] 2+. These are the simulations of liquid column chromatography for optical resolution.
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