Adsorption/Desorption Hysteresis in Organic Pollutant and Soil/Sediment Interaction

Kan, Amy T.; Fu, Gongmin; Tomson, Mason B.

doi:10.1021/es00054a017

Cited by 252 publications

(242 citation statements)

References 41 publications

Supporting

Mentioning

220

Contrasting

Unclassified

Order By: Relevance

“…The mass balance of > 91% was obtained, suggesting that the hysteresis observed in this study was due to the difference between the sorption and desorption rates (Kan et al 1997). In agreement with this observation, irreversible sorption-desorption of hydrophobic organic pollutants such as PAHs is a commonly observed phenomenon (Kan et al 1994;Hwang et al 2003;Sun et al 2003). For example, Kan et al (1994) found that only 38% of the adsorbed phenanthrene desorbed in a total of 178 days.…”

supporting

confidence: 84%

“…In agreement with this observation, irreversible sorption-desorption of hydrophobic organic pollutants such as PAHs is a commonly observed phenomenon (Kan et al 1994;Hwang et al 2003;Sun et al 2003). For example, Kan et al (1994) found that only 38% of the adsorbed phenanthrene desorbed in a total of 178 days. Recently, a biphasic irreversible adsorption model has been proposed to account for an irreversibly bound portion of the sorbed hydrophobic organic pollutants (Kan et al 1997(Kan et al , 1998.…”

mentioning

confidence: 58%

“…The final distribution of PAHs in the soil/sediment-water systems is controlled mainly by sorption-desorption processes (Kan et al 1994;Hwang & Cutright 2002). Sorption is also the primary physico-chemical process affecting the transport, biodegradability, and bioavailability of many hydrophobic organic chemicals, including PAHs, in soils and sediments (Piatt et al 1996;Ortega-Calvo et al 1997;Reemtsma & Mehrtens 1997).…”

mentioning

confidence: 99%

See 2 more Smart Citations

Effect of temperature on the distribution of polycyclic aromatic hydrocarbons in soil and sediment

Hiller¹,

Jurkovič²,

Bartaľ³

2008

Soil & Water Res.

View full text Add to dashboard Cite

Abstract:The knowledge of sorption-desorption processes of polycyclic aromatic hydrocarbons (PAHs) in natural solids is essential to predict the fate, transport, and environmental risks of these pollutants. In this study, the effect was investigated of temperature on the sorption-desorption of three PAHs (naphthalene, phenanthrene, and pyrene) in two natural solids with different organic carbon contents. In all cases, the sorption isotherms obtained could be well described by the linear sorption model. The analysis based on the measured isotherms and the corresponding equilibrium partition coefficients (k p ) revealed that (1) the sorption of PAHs increased with organic carbon content of the solid and PAH hydrophobicity in the order: sediment < soil and naphthalene < phenanthrene < pyrene, respectively, and (2) the extent of PAH sorption decreased with increasing temperature from 4°C to 27°C on average by 27.3, 17.0, and 27.4% for naphthalene, phenanthrene, and pyrene, respectively. The enthalpies of sorption (∆H s ) calculated by van't Hoff equation were negative, relatively small, and in the range of weak forces such as van der Waals forces (0-9 kJ/mol), consistent with hydrophobic interactions and partitioning of the PAHs into soil/sediment organic matter. The desorption of naphthalene and phenanthrene showed significant hysteresis, i.e. great fraction of PAHs was resistant to desorption and somewhat increased with temperature.

show abstract

supporting

confidence: 84%

mentioning

confidence: 58%

mentioning

confidence: 99%

See 1 more Smart Citation

Effect of temperature on the distribution of polycyclic aromatic hydrocarbons in soil and sediment

Hiller¹,

Jurkovič²,

Bartaľ³

2008

Soil & Water Res.

View full text Add to dashboard Cite

show abstract

“…The desorption reaction plays a key role in the transport of organic compounds in soils . Most research work on the desorption of organic from soils were conducted in batch or continuous mode (Kan et al, 1994;Pavlostathis and Jaglal, 1991). These desorption experiments were usually conducted under over-saturated conditions (i.e., soils mixed with a large amount of solution).…”

Section: Desorption Kinetics Of Chlorinated Organicsmentioning

confidence: 99%

Electrochemical Processes for In-Situ Treatment of Contaminated Soils - Final Report - 09/15/1996 - 01/31/2001

Huang¹

2001

View full text Add to dashboard Cite

Contamination of soils by toxic organic pollutants is an environmental concern. The insitu electrokinetic (EK) technology is an emerging process to remediate the contaminated soils. Since the electro-osmotic (EO) flow rate and sorption behaviors of pollutants are two critical factors of the process, this study focuses on understanding the partition of nonionic organic contaminants in soil-water system, mechanisms of the EO flow, and the transport of organic compounds under an externally applied electrostatic field. The target compounds include chlorinated organic compounds and polycyclic aromatic hydrocarbons (PAHs). In order to improve the treatment efficiency, surfactant and bio-surfactant were used. A thermodynamic concept, fugacity, was introduced to illustrate the interactions between organics and the soil. A semi-empirical equation was derived to describe the EO flow rate in unsaturated soils. Moverover, the diffusion-advection-sorption model was used to simulate the transport of nonionic organic contaminants in the presence of an electrostatic field.The sorption experiments were conducted with various initial solute concentrations and different soil to solution ratios. The selected chlorinated organics include tetrachloroethylene (PCE), trichloroethylene (TCE), carbon tetrachloride, and chloroform. Results show that Langnuir isotherm can be used to express the distribution behavior of these chlorinated organic compounds i n the soil-water system. In addition to the hydrophobicity (K ow ), the concentration of organic compound and soil to solution ratio can influence the distribution behavior also. In order to illustrate the effects of the organic concentration and soil to solution ratio, the activity coefficient was used.The activity coefficient, γ, a relative interaction based on chosen reference state, is a useful means to express the quantitative feature of the organic-soil interaction without detailed information of their interaction mechanisms. By comparing the activity coefficients, γ w and γ s (i.e., X s /X w ), one can illustrate the trend of organic distribution at the soil-water interfaces.The concentration effect can be explained by the changes in the adsorption of organic onto the soil surface. Based on the experimental results, when increasing the organic compound concentrations, the activity coefficient, γ w , can be considered as a constant and γ s increases due to the increase of interaction energy. The change of γ s makes the sorption isotherms of PCE, TCE, carbon tetrachloride, and chloroform non-linear. According to γ s , it can be seen that the sorption between these selceted chlorinated organics and the soil is exothermic.The effect of soil to solution ratio can be attributed to the presence of dissolved organic matter (DOM) in the liquid phase. DOM enhances the organic dissolution, which in turns increases the organic concentration, i.e., X w . Therefore, the partition coefficients of these chlorinated compounds, i.e., X s /X w , decrease with increasing the soil to solution ...

show abstract

“…Despite the large number of studies supporting "partition" model sorption through linear sorption of HOCs to HA (90,96,97), many recent studies give evidence for partition character by reporting nonlinear sorption isotherms (89,(98)(99)(100)(101)(102)(103)(104), solute-solute competition (88,95,98), and desorption hysteresis (105)(106)(107)(108)(109). These observations cannot be by attributing "dual-mode" sorption properties to SOM (110)(111)(112)(113)(114)(115).…”

Section: Sorption Mechanisms Of Hydrophobic Organic Compoundsmentioning

confidence: 99%

Heinrich‐Heine‐Universität Düsseldorf

2017

Geschichte Der Anorganischen Chemie

View full text Add to dashboard Cite

Adsorption/Desorption Hysteresis in Organic Pollutant and Soil/Sediment Interaction

Cited by 252 publications

References 41 publications

Effect of temperature on the distribution of polycyclic aromatic hydrocarbons in soil and sediment

Effect of temperature on the distribution of polycyclic aromatic hydrocarbons in soil and sediment

Electrochemical Processes for In-Situ Treatment of Contaminated Soils - Final Report - 09/15/1996 - 01/31/2001

Heinrich‐Heine‐Universität Düsseldorf

Contact Info

Product

Resources

About