Adsorption of phenanthrene on Na-montmorillonite: A model study

Meleshyn, Artur; Tunega, Daniel

doi:10.1016/j.geoderma.2010.09.018

Cited by 27 publications

(23 citation statements)

References 23 publications

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“…This can be attributed to a hydrophobic effect, which led to only a moderate change in the water-mediated NOE build-up rate. This was consistent with the literature according to which polycyclic aromatic carbons may bind to clay surfaces [16,22,23,[53][54][55]. In addition, the pyridine moiety, which contains a lone pair of electrons on the nitrogen, is readily available for hydrogen bonding with the water and the hydroxyls groups present on clay surfaces.…”

Section: Water Noe-driven Epitope Map Of Clay-xenobiotic Interactionssupporting

confidence: 91%

“…Amongst the inorganic constituents in soil, clays constitute the major component (often around 30% w/w) and are important in the preservation of labile organic compounds. Clays are inorganic materials composed prevalently of layers of SiO 4 and/or AlO 4 [16]. Because of their anionic nature, the surfaces of clays are covered with small cations.…”

Section: Introductionmentioning

confidence: 99%

“…Because of their anionic nature, the surfaces of clays are covered with small cations. For instance, a host of cations, such as Na , and NH 4 + are capable of binding to clay surfaces, giving them different colloidal property [16]. In addition to sequestering cations from solution, clays are capable of adsorbing water molecules on their surfaces through hydrogen bonding, allowing them to expand and swell several times their dry mass [17,18].…”

Section: Introductionmentioning

confidence: 99%

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Water-mediated NOE: a promising tool for interrogating interfacial clay–xenobiotic interactions

Soong

Botana

Wang

et al. 2017

Chem. Biol. Technol. Agric.

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Background:The sorption of anthropogenic compounds on clay minerals is a complex molecular process with important implications for the fate of agrochemicals and organic pollutants in the environment. Results:The present study illustrates the use of a water-mediated NOE approach to study clay binding interactions. This method exploits the interfacial water layer on clay surfaces as a hydrogen reservoir for magnetization transfer. The interactions of four different xenobiotics with clay suspension were investigated through this method to demonstrate its capability to screen for the clay-xenobiotic molecular affinity. Further, based onthe NOE build-up rates, epitope map of clay-xenobiotic interactions can be generated, explaining theorientation and mechanism of the interactions. Conclusions:The water-mediated NOE approach has the potential to reveal key insights into the role that interfacial water plays in the binding process, providing a better understanding of the partitioning of anthropogenic compounds from bulk water into aqueous clay suspensions.

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Section: Water Noe-driven Epitope Map Of Clay-xenobiotic Interactionssupporting

confidence: 91%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Water-mediated NOE: a promising tool for interrogating interfacial clay–xenobiotic interactions

Soong

Botana

Wang

et al. 2017

Chem. Biol. Technol. Agric.

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“…Our results indicate that either the high molecular weight PAH sorption to peat and clay is not comparable to phenanthrene sorption or that the release of PAH from clay minerals into the liquid phase is lower in the digestive juicesolid system compared to the water-solid system. PAH sorption to clay minerals in the water-solid system still remains a controversial issue (Meleshyn and Tunega 2011). Zhu et al (2004) described cation-π bonding at the mineral surface as the major process, while Hundal et al (2001) and Müller et al (2007) found evidence for capillary condensation of phenanthrene into a network of nanosites and microsites of quasicrystals or tactoids of clay minerals.…”

Section: Resultsmentioning

confidence: 99%

Impact of reference geosorbents on oral bioaccessibility of PAH in a human in vitro digestive tract model

Meyer

Kons

Achten

2014

Environ Sci Pollut Res

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Former studies on human oral bioaccessibility of polycyclic aromatic hydrocarbons (PAH) from natural soil samples using human in vitro digestive tract models (physiologically based extraction tests, PBET) show highly variable results (0-100% of mobilized PAH). Apart from other factors, the type and amount of present geosorbents are assumed to be significant for the degree of desorption/release of PAH into the digestive juice. Therefore, in this study, the reference geosorbents pure quartz sand, Na-montmorillonite clay, Pahokee peat, and charcoal "Sommerhit" were spiked with selected deuterated PAH and employed as single materials in a PBET. Lowest bioaccessibility was determined in charcoal, representing black carbon (0.1 ± 0.1 % for ∑10 PAH-d) in contrast to higher bioaccessibility in peat (6.4 ± 2.2%) and clay (4.8 ± 1.1%). Highest bioaccessibility was determined in sand (26.9 ± 7.5%). The results show a systematic impact of heterogeneous geosorbents on human oral bioaccessibility of PAH and particularly black carbon acting as a very strong geosorbent that reduces human health risk.

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“…Over the past decades, the influences of clay minerals on the fate and transport of light fractions of crude oil such as polycyclic aromatic hydrocarbons (PAH) and alkanes have been intensively investigated (El-Nahhal and Safi, 2004;Meleshyn and Tunega, 2011). There are increasing demands for exploring the interactions between clay minerals and the heavy fractions of crude oil such as asphaltenes.…”

Section: Introductionmentioning

confidence: 99%