Adsorption Mechanism and Structure of the Montmorillonite Complexes with (CH3)2XO (X=C, and S), (CH3O)3PO, and CH3–CN Molecules

Dios-Cancela, G.; Alfonso-Méndez, L.; Huertas, F. Javier; Romero, Esperanza; Sainz‐Díaz, C. Ignacio; Laguna, Abilio

doi:10.1006/jcis.1999.6550

Cited by 21 publications

(16 citation statements)

References 26 publications

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“…When montmorillonite at a concentration of 1.6 g/L was treated with 0.3 mM PC, a basal spacing of 1.56 nm was observed (Figure 3), which is associated with adsorbed monomers lying in parallel to the partially dehydrated surface. A similar basal spacing of 1.62 nm was obtained for the adsorption as a planar monolayer of the organic molecule trimethylphosphate on montmorillonite (19). However, the diffraction pattern changed completely when raising the phospholipid concentration to 6 mM.…”

Section: Modeling Of Liposome Adsorption On Montmorillonitesupporting

confidence: 72%

Environmentally Friendly Slow Release Formulations of Alachlor Based on Clay-Phosphatidylcholine

Sánchez-Verdejo

Undabeytia

Nir

et al. 2008

Environ. Sci. Technol.

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A new clay-liposome complex was developed for reducing leaching of herbicides and contamination of groundwater. The liposomes were composed of the neutral and Environmental Protection Agency approved phospholipid phosphatidylcholine (PC). Adsorption of PC liposomes on the clay mineral montmorillonite could exceed the cation exchange capacity of the clay, and was well simulated by the Langmuir equation. X-ray diffraction results for 6 mM PC and 1.6 g/L clay (3 day incubation) yielded a basal spacing of 7.49 nm, which was interpreted as the formation of a supported planar bilayer on montmorillonite platelets. Fluorescence methods demonstrated structural changes which reflected adsorption of PC followed by loss of vesicle integrity as measured by the penetration of dithionite into the internal monolayer of fluorescently labeled liposomes, resulting in a decrease in fluorescence intensity to 18% of initial after 4 h. Energy transfer was demonstrated after 1 h from labeled liposomes to montmorillonite labeled by an acceptor. The neutral herbicide alachlor adsorbed on the liposome-clay complex, yielding a formulation of up to 40% active ingredient, and 1.6-fold reduction in herbicide release in comparison to the commercial formulation. Hence, the PC-montmorillonite complex can form a basis for environmentally friendly formulations of herbicides, which would yield reduced leaching.

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Section: Modeling Of Liposome Adsorption On Montmorillonitesupporting

confidence: 72%

Environmentally Friendly Slow Release Formulations of Alachlor Based on Clay-Phosphatidylcholine

Sánchez-Verdejo

Undabeytia

Nir

et al. 2008

Environ. Sci. Technol.

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“…DMSO is an effective solvent for solute delivery into clay interlayers, because DMSO has a high affinity for both 2:1 and 1:1 phyllosilicates [36–38]. To maximize TCDD sorption in the K-saponite interlayers while keeping the amount of TCDD sorbed on the external surface to a minimum, the minimum volume of DMSO required to expand the K-saponite clay fully was used.…”

Section: Resultsmentioning

confidence: 99%

Suppression of humoral immune responses by 2,3,7,8‐tetrachlorodibenzo‐p‐dioxin intercalated in smectite clay

Boyd

Johnston

Pinnavaia

et al. 2011

Enviro Toxic and Chemistry

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2,3,7,8-Tetrachlorodibenzo-p-dioxin (TCDD) is a highly toxic environmental contaminant found in soils and sediments. Because of its exceptionally low water solubility, this compound exists predominantly in the sorbed state in natural environments. Clay minerals, especially expandable smectite clays, are one of the major component geosorbents in soils and sediments that can function as an effective adsorbent for environmental dioxins, including TCDD. In this study, TCDD was intercalated in the smectite clay saponite by an incipient wetness method. The primary goal of this study was to intercalate TCDD in natural K-saponite clay and evaluate its immunotoxic effects in vivo. The relative bioavailability of TCDD was evaluated by comparing the metabolic activity of TCDD administered in the adsorbed state as an intercalate in saponite and freely dissolved in corn oil. This comparison revealed nearly identical TCDD-induced suppression of humoral immunity, a well-established and sensitive sequela, in a mammalian (mouse) model. This result suggests that TCDD adsorbed by clays is likely to be available for biouptake and biodistribution in mammals, consistent with previous observations of TCDD in livestock exposed to dioxin-contaminated ball clays that were used as feed additives. Adsorption of TCDD by clay minerals does not appear to mitigate risk associated with TCDD exposure substantially.

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“…Dios-Cancela et al have studied the formation of montmorillonite samples with different ligands such as acetone and acetonitrile, using characterization techniques such as X-ray diffraction (XRD), infrared spectroscopy, and ab initio quantum mechanical methods and found out that the clay cation-ligand interaction is ion-dipole electrostatic in nature and these samples are formed by the direct interaction of the oxygen or nitrogen atom of ligand and the interlayer cation [12]. Molecular dynamics studies on clay-water interactions have shown the quantitative relationship between swelling of interlayers of clays with hydration [13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Nature of organic fluid–montmorillonite interactions: An FTIR spectroscopic study

Amarasinghe

Katti

2009

Journal of Colloid and Interface Science

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Adsorption Mechanism and Structure of the Montmorillonite Complexes with (CH3)2XO (X=C, and S), (CH3O)3PO, and CH3–CN Molecules

Cited by 21 publications

References 26 publications

Environmentally Friendly Slow Release Formulations of Alachlor Based on Clay-Phosphatidylcholine

Environmentally Friendly Slow Release Formulations of Alachlor Based on Clay-Phosphatidylcholine

Suppression of humoral immune responses by 2,3,7,8‐tetrachlorodibenzo‐p‐dioxin intercalated in smectite clay

Nature of organic fluid–montmorillonite interactions: An FTIR spectroscopic study

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