Surfactant–soil interactions during surfactant-amended remediation of contaminated soils by hydrophobic organic compounds: A review

Laha, Shonali; Tansel, Berrin; Ussawarujikulchai, Achara

doi:10.1016/j.jenvman.2008.08.006

Cited by 191 publications

(110 citation statements)

References 50 publications

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“…where S cmc is the apparent solubility of 2,4,6-TCP in moles per liter at the CMC; S mic is the total apparent solubility of 2,4,6-TCP in moles per liter in micellar solutions at a particular surfactant concentration greater than the CMC; and C surf is the surfactant concentration at which S mic is evaluated. The MSR can be obtained from the slope of the solubility curve above the critical micelle concentration [2].…”

Section: Molar Solubilization Ratio (Msr) Of Nadc Nac Sds and B-cdmentioning

confidence: 99%

“…One was the micelle phase dissolved in solution, and the other was adsorbed on the soil surface. The latter would result in increased 2,4,6-TCP adsorption onto soil until 2,4,6-TCP solubilization by the micelle phase surfactant successfully competed with increased 2,4,6-TCP sorption onto surfactant-modified soil [2]. HOCs distributed between the mobile and immobile phases varied with surfactant dose due to competition between adsorbed and micelle phase surfactant [20].…”

Section: Solubilization Mechanism In the Presence Of Surfactantsmentioning

confidence: 99%

“…The contamination of soils and groundwater by toxic and/or hazardous organic compounds has become a widespread environmental problem, therefore the removal of hydrophobic organic compounds (HOCs) from them has received serious consideration [1,2]. In response to a growing need to address environmental contamination, many remediation technologies have been developed to treat soil [3,4].…”

Section: Introductionmentioning

confidence: 99%

“…Even so, some research has indicated that the surfactants would also adsorb onto the soil matrix and thereby lead to HOCs partitioning into the immobilised adsorbed surfactants [17][18][19][20]. This would result in a rebound in HOCs adsorption capacity onto the soil [2]. Solubilization of HOCs into surfactant aggregates adsorbed on solid surfaces is sometimes referred to as ''adsolubilization'' [21].…”

Section: Introductionmentioning

confidence: 99%

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Solubilization and adsorption behaviors of 2,4,6-trichlorophenol in the presence of surfactants

Zeng

Peng

Liu

et al. 2013

Chemical Engineering Journal

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h i g h l i g h t sThe solubility of 2,4,6-trichlorophenol was enhanced 72 times by sodium deoxycholateat pH 7.5. NaDC demonstrated the best solubilization potential, followed by NaC, SDS and b-CD. The adsorption of 2,4,6-trichlorophenol was almost zero when NaC concentration was above CMC 2 . a r t i c l e i n f o t r a c tThe solubilization of 2,4,6-trichlorophenol (2,4,6-TCP) was studied in the presence of four different surfactants, namely sodium deoxycholate (NaDC), sodium cholate (NaC), sodium lauryl sulfate (SDS) and bcyclodextrin (b-CD). The solubility of 2,4,6-TCP was enhanced a maximum of 72 times especially by NaDC at pH 7.5. In addition, other than great solubilization capacities, NaDC and NaC have the advantages of high biodegradability and biocompatibility as biosurfactants. The adsorption behaviors of 2,4,6-TCP on the surface of soil in the presence of these solubilizers were examined. The results showed that the adsorption isotherms for all studied surfactants matched the Henry adsorption isotherm well. The adsorption mechanisms were explored and the adsorption behaviors of 2,4,6-TCP were affected by different micelle forms of the surfactants based on their critical micelle concentration (CMC). The adsorption process was demonstrated by a redistribution procedure between surfactants in solution and surfactants adsorbed onto the soil surface. In particular, the adsorption of 2,4,6-TCP was almost zero when NaC concentration was above CMC 2 .The results of our study have important implications for soil remediation and non-point source pollution control.

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Section: Molar Solubilization Ratio (Msr) Of Nadc Nac Sds and B-cdmentioning

confidence: 99%

Section: Solubilization Mechanism In the Presence Of Surfactantsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Solubilization and adsorption behaviors of 2,4,6-trichlorophenol in the presence of surfactants

Zeng

Peng

Liu

et al. 2013

Chemical Engineering Journal

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“…For practical purposes, an ideal surfactant should have high solubilizing ability towards the pollutant and low adsorption on soil. Although various studies have been reported, there are still different opinions about the surfactant adsorption mechanisms (Laha et al 2009). Adsorption of ionic surfactants is generally correlated with electrostatic forces (Paria and Khilar 2004), whereas hydrogen bonding is considered the main force operating in nonionic surfactants adsorption.…”

Section: Background and Purposementioning

confidence: 99%

Removal of alkylphenols from polluted sites using surfactant-assisted soil washing and photocatalysis

Davezza

Fabbri

Prevot

et al. 2010

Environ Sci Pollut Res

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Background and Purpose Surfactant-assisted soil washing and photocatalysis are well known remediation processes of environmental concern. The application of photocatalysis to treat soil washing extracts containing 4-methylphenol, 4-ethylphenol and 4-tert-butylphenol in the presence of nonionic (C 12 E 8 and C 12 E 23 ) and anionic (SDS) surfactants and some of their binary mixtures was investigated in this work by studying the pollutants degradation in the presence of TiO 2 dispersions irradiated with simulated solar light. Materials and methods Clean soil samples were spiked with the investigated alkylphenols. Aqueous solutions of the chosen surfactants were placed in contact for some hours with the spiked soil samples in a rotatory mixer. The pollutants recoveries were evaluated via HPLC analysis. Photocatalytic experiments were performed in solarbox on aqueous solutions and on aqueous surfactant solutions containing the pollutants. Results The pollutants removal from the soil was proven effective using the examined surfactant solutions. The photocatalytic treatment of the wastes was faster using Brij 35, but also SDS and C 12 E 8 -SDS mixtures can be applied. After 2-5 hours the complete pollutants abatement was obtained, depending on the surfactant chosen and on the amount of TiO 2 employed. On the contrary, the treatment of wastes containing C 12 E 8 was an extremely slow process. Conclusions The photocatalytic approach can be applied to remove the examined aromatic pollutants from the washing wastes, confirming the viable coupling between this advanced oxidation method and the surfactant-based soil remediation treatments. Surfactant adsorption onto TiO 2 and micelles concentration play a dominant role.

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Bioremediation

Prince

2009

Kirk-Othmer Encyclopedia of Chemical Technology

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Bioremediation is the process of judiciously exploiting biological processes to minimize an unwanted environmental impact; usually the aim is the removal of a contaminant from the biosphere. Like most definitions in biology, that of bioremediation is the subject of some debate. A narrow definition might focus on the conversion of contaminating organic molecules to CO 2 , water, and inorganic ions, and the oxidation or reduction of contaminating inorganic ions such as nitrate or ammonia to harmless forms, in this case nitrogen gas. A broader definition would include biological processes for ameliorating extremes of pH, concentrating contaminants so that they can be more easily removed by physical techniques, converting toxic species to less toxic or less bioavailable forms that pose less of a threat to the environment, and restoring functional ecosystems to contaminated or disturbed sites when the contaminants or disturbance cannot be removed.

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Surfactant–soil interactions during surfactant-amended remediation of contaminated soils by hydrophobic organic compounds: A review

Cited by 191 publications

References 50 publications

Solubilization and adsorption behaviors of 2,4,6-trichlorophenol in the presence of surfactants

Solubilization and adsorption behaviors of 2,4,6-trichlorophenol in the presence of surfactants

Removal of alkylphenols from polluted sites using surfactant-assisted soil washing and photocatalysis

Bioremediation

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