Influence of a Nonionic Surfactant (Triton X-100) on Contaminant Distribution between Water and Several Soil Solids

Lee, Jiunn Fwu; Liao, Pao Mei; Kuo, Chun Chih; Yang, Hsiu Ting; Chiou, Cary T.

doi:10.1006/jcis.2000.7039

Cited by 76 publications

(88 citation statements)

References 26 publications

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“…The adsorbed mass increases with surfactant concentrations and eventually reaches a plateau when the CTMAB equilibrium concentration in water is approximately equal to the CMC (about 250 μg/mL). The isotherm is distinctly nonlinear and exhibits the characteristics of an L-type curve as previously reported (Lee et al 2000;Rosen and Li 2001;Mishael et al 2002;Zhu et al 2003). The sharpest curvature on the isotherm occurs at an aqueous concentration close to the CMC.…”

Section: Sorption Of Ctmab On Bentonitesupporting

confidence: 71%

“…At low aqueous CTMAB concentrations, K d values increase with increasing surfactant concentration because the amount of CTMAB adsorbed to bentenite increases rapidly in this region, and because the sorbed CTMAB is very effective for solute partitioning. As shown, the K Ã d values are higher than the K d values, which indicates that the level of CTMAB applied decreases the pesticide mobility, a trend noted for other contaminants at low-to-moderate surfactant levels when the solid has a low f oc value (Lee et al 2000). When the concentration of CTMAB in the solution reaches its CMC, surfactant sorption to bentonite levels off to a plateau and the micelles that form in solution compete for pesticide molecules, causing a decrease in K Ã d .…”

Section: Sorption Of Ctmab On Bentonitementioning

confidence: 70%

“…3, 4, and 5. The relationship between K Ã d and K d for a subsaturated contaminant in a soil/solid-water mixture with or without a surfactant as a function of the contaminant level in solid and solution phase has been established (Sun et al 1995;Lee et al 2000),…”

Section: Sorption Of Ctmab On Bentonitementioning

confidence: 99%

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Sorption of methyl-parathion and carbaryl by an organo-bentonite

et al. 2006

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The modification of bentonite clays by cetyltrimethylammonium bromide (CTMAB) surfactant via cation-exchange produces materials ("organo-clays") with an increased capacity for sorbing organic compounds such as pesticides. The sorption from solutions of two nonionic pesticides, methyl-parathion and carbaryl, by an organobentonite has been investigated. The pesticides are partitioned into the surfactant. The distribution coefficients, K ss , show a strong dependence on surfactant loading of the bentonite. The surfactant configuration at the clay surface has a marked influence on the effective volume and density of the bound surfactant. At low surfactant loadings, the K ss values increased, reached a maximum, and then decreased as the extent of loading increased. At low loading levels, the surfactant appears to form a monolayer (organic film) that effectively adsorbs the pesticides, resulting in very high K ss values. At high loadings, the sorbed surfactant appears to form a bulk-like medium that behaves essentially as a distribution phase. As a result, the K ss values decreased appreciably, and became less dependent on the CTMAB loading. Moreover, when the surfactant concentration in water was greater than the critical micelle concentration, the surfactant uptake on the clay reaches a plateau and an increasing fraction of the micelles remain in solution, together with the pesticides which bound to them. The competition for the pesticides between the aqueous micelles and the sorbed surfactant leads to a decrease in distribution coefficients.

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Section: Sorption Of Ctmab On Bentonitesupporting

confidence: 71%

Section: Sorption Of Ctmab On Bentonitementioning

confidence: 70%

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Sorption of methyl-parathion and carbaryl by an organo-bentonite

et al. 2006

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“…The initial increase of SDBS sorption was attributed to the precipitation of SDBS with divalent metal ions such as Ca 2+ and Mg 2+ , while the decrease of SDBS sorption as surfactant concentration increase was attributed to the redissolution of the precipitated SDBS-Ca 2+ complex in surfactant solution ). Due to sorption of surfactants on soil, the effective concentration of surfactants in solution to solubilize organic contaminants decreased and the hydrophobicity and organic carbon content of soil increased, which facilitated the sorption of organic contaminants to soil (Lee et al 2000;Paria and Yuet 2006;Zheng and Obbard 2002). The precipitation of SDBS with mineral ions in soil such as Ca 2+ appears to be the primary mechanism for the sorption of SDBS onto soil (Yang et al 2005(Yang et al , 2007, while hydrogen bonding may be considered as the major driving force for nonionic surfactants' sorption onto soil (Mathur and Moudgil 1998).…”

Section: Resultsmentioning

confidence: 99%

Effect of SDBS–Tween 80 mixed surfactants on the distribution of polycyclic aromatic hydrocarbons in soil–water system

Zhang

Zhu

2010

J Soils Sediments

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Purpose Enhancing desorption of hydrophobic organic contaminants from soils is a promising approach for the effective remediation of soils contaminated with organic compounds. The desorption efficiency of chemical reagent, such as surfactant, should be evaluated. In this study, the effect of mixed anionic-nonionic surfactants sodium dodecylbenzene sulfonate (SDBS)-Tween 80 on the distribution of polycyclic aromatic hydrocarbons in soil-water system was evaluated. Materials and methods Batch desorption experiments were employed to evaluate the distribution of polycyclic aromatic hydrocarbons (PAHs) and surfactants in soil-water system. PAHs and SDBS were determined by highperformance liquid chromatography, Tween 80 by spectrophotometry, and total organic carbon with a carbon analyzer. Results and discussion Sorption of PAHs to soil was increased at low surfactant concentration due to the effective partition phase on soil formed by sorbed surfactants. The mixture of anionic and nonionic surfactants decreased the sorption of surfactants to soil, increasing the effective surfactant concentration in solution and thus decreasing the sorption of PAHs on soil. Anionic-nonionic mixed surfactant showed better performance on desorption of PAHs from soil than single surfactant. The greatest desorption efficiency was achieved with low proportions of SDBS (SDBS/Tween80=1:9). Conclusions SDBS-Tween 80 mixed surfactant showed the highest desorption rate with low proportion of SDBS, which indicated that the addition of relative low amount of anionic surfactant could significantly promote the desorption efficiency of PAHs by nonionic surfactants. Results obtained from this study did provide useful information in surfactant-enhanced remediation of soil and subsurface contaminated by hydrophobic organic compounds.

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“…where K Ã d and K d is the distribution coefficient of phenanthrene on sediments with and without Tween20; f sf is the mass fraction of the sorbed Tween20 on sediments; K sf is the distribution coefficient of phenanthrene between the sorbed Tween20 and water; X mn is the concentration of Tween20 as monomer in water (mass/mass, dimensionless) (X mn ¼ X, if X CMC [critical micell concentration], X mn ¼ CMC, if X > CMC); X mc is the concentration (dimensionless) of Tween20 as micelle in water (X mc ¼ X À CMC); K mn is phase partition coefficient of the solute between Tween20 monomer and water (dimensionless); and K mc is the solute partition coefficient between the aqueous micellar phase and water (dimensionless) [46,47]. From Table 6, it can be seen that K Ã d value was larger than K d , and the presence of Tween20 enhanced the function between sediments and phenanthrene, the extent of which was directly proportional to the concentration of Tween20.…”

Section: Adsorption Isotherms Of Phenanthrene With Tween20mentioning

confidence: 99%

Studies on the sorption behaviors of phenanthrene on marine sediments

Yang

Zheng

2010

Enviro Toxic and Chemistry

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In the present study, the sorption behaviors of phenanthrene on marine sediments were investigated. Through the study of the adsorption kinetics and isotherms, the adsorption mechanism of phenanthrene on marine sediments was described. The results showed that the adsorption kinetics of phenanthrene on marine sediments could be described by the second-order kinetic equation. The sorption rate of phenanthrene was very rapid, and the equilibrium time was slightly longer in deionized water than in natural seawater. The adsorption isotherms of phenanthrene on all the sediments could be very well described by Freundlich equations. The adsorption capacity of phenanthrene had a significant positive correlation with the sediment organic carbon content. Some external factors that could affect adsorption behaviors of phenanthrene were also investigated. Results of the present study showed that the adsorption capacity of phenanthrene on the sediment decreased with increasing temperature. Moreover, the adsorption amounts of phenanthrene on the sediment appeared to be lower in natural seawater than in deionized water. Finally, the presence of the surfactant of Tween20 in the system could enhance the adsorption of phenanthrene on the sediment, and the adsorbance was proportional to the concentration of Tween20.

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Influence of a Nonionic Surfactant (Triton X-100) on Contaminant Distribution between Water and Several Soil Solids

Cited by 76 publications

References 26 publications

Sorption of methyl-parathion and carbaryl by an organo-bentonite

Sorption of methyl-parathion and carbaryl by an organo-bentonite

Effect of SDBS–Tween 80 mixed surfactants on the distribution of polycyclic aromatic hydrocarbons in soil–water system

Studies on the sorption behaviors of phenanthrene on marine sediments

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