Using the dual-mode model to describe adsorption of organic pollutants onto an organoclay

Gonen, Yotam; Rytwo, Giora

doi:10.1016/j.jcis.2006.01.055

Cited by 46 publications

(18 citation statements)

References 31 publications

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“…The most plausible explanation is related to the presence of expansive clays. Clays are not normally characterized as adsorption sites for polycyclic aromatic hydrocarbons (Gonen and Rytwo 2006). However, with the expansion of the interlamellar space caused by the hydration of the clays, more sorption sites appear to become available, leading to an increase in Q.…”

Section: Resultsmentioning

confidence: 99%

Study of Pyrene Adsorption on Two Brazilian Soils

Teixeira

Ziolli

Marques

et al. 2010

Water Air Soil Pollut

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This study investigated pyrene adsorption on two contrasting Brazilian soils: a Kandiudult and a Vertisol. It was found that the time taken to reach thermodynamic equilibrium depended on the soil type. The curves for different pyrene-to-soil mass ratios for Vertisol soil showed significant differences. This is probably related to the presence of 2:1 clays that may increase the adsorption of pyrene due to the resulting interlamellar space. The adsorption of pyrene on the Kandiudult showed, in general, good agreement with the Langmuir isotherm. In the case of the Vertisol, there was good agreement with the linear isotherm. The kinetic model that best explains the adsorption in Kandiudult was the pseudo secondorder model. For the Vertisol, the Morris Weber model best explains the behavior of pyrene.

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Section: Resultsmentioning

confidence: 99%

Study of Pyrene Adsorption on Two Brazilian Soils

Teixeira

Ziolli

Marques

et al. 2010

Water Air Soil Pollut

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“…As this soil's organic matter content is below 0.1%, pyrene sorption was attributed to fine soil materials (Karichoff 1984). As Gonen and Rytwo (2006) reported, clays are not normally characterized as adsorption sites for PAHs; however, with the expansion of the interlamellar space caused by the hydratation of the clays, more sorption sites appear to become available (Teixeira et al 2010). …”

Section: Resultsmentioning

confidence: 76%

Influence of Soil Granulometry on Pyrene Desorption in Groundwater Using Surfactants

Rodríguez‐Escales

Sayara

Vicent

et al. 2011

Water Air Soil Pollut

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The high hydrophobicity of polycyclic aromatic hydrocarbons (PAHs) is the main limiting factor for the remediation of soils and aquifers. Surfactants are amphiphilic substances which encourage the transfer of hydrophobic compounds from the solid to the liquid phase. While the interaction between organic matter and surfactants has been widely studied, there is a lack of knowledge concerning the relationship between surfactant efficiency and the granulometry of soil and/or geologic material. In this paper, three non-ionic surfactants (Tween 80, Gold Crew, and BS-400) were used to study the desorption of pyrene, chosen as a representative PAH, in soils with different grain size proportions (1%, 5%, 10%, and 20% of clay and silt) and no organic matter (<0.1%). The best quantity of surfactant to apply is closely related to the proportion of fine materials. Tween 80 gave better maximum desorption than Gold Crew and BS-400 (89%, 40%, and 36%, respectively). As an important proportion of aquifers show fine material above 1%, the effective critical micellar concentration obtained when applying surfactants to this type of geologic materials has to be higher than 150 mg L −1 for Tween 80, and higher than 65 mg L −1 , and 100 mg L −1 for Golf Crew and BS 400, respectively. Furthermore, results indicate that carrying out simple laboratory tests before the use of surfactants on a field scale is necessary to improve the efficiency and minimize the financial and environmental impact of its application.

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“…There are several options for locating and removal of these dangerous substances, e.g. : organic (toluene, ethylbenzene, xylene) (Jarray et al, 2010) from the natural environment (Gonen and Rytwo, 2006) that are however not suitable for all substances and therefore development and search for new methods are very important. The sorption method which uses modifi ed clay materials has been used for the removal of heavy metals (Cu, Cd, Zn, Ag, Pd, Hg and others) from the aquatic environment (Li et al, 2010).…”

Section: Methodsmentioning

confidence: 99%