Coadsorption of 2-Naphthol and Cetylpyridinium Chloride at a Silica/Water Interface in Relation with the Micellar Solubilization Effect

Monticone, V.; Mannebach, M. H.; Treiner, Claude

doi:10.1021/la00019a060

Cited by 56 publications

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“…Cetylpyridinium chloride (CPC) (analytical reagent grade) and sodium dodecylbenzene sulfonate (SDBS) (analytical reagent grade) were purchased from Central Chemical Factory in Shanghai Chemical Reagent Station, China. The literature critical micelle concentration (CMC) of CPC and SDBS were 322 and 522 mg/L, respectively (Monticone et al 1994).…”

Section: Methodsmentioning

confidence: 99%

Effect of heavy metals and surfactants on the adsorption of phenolic compounds on sediment

Gao

Zhang

Liu

et al. 2012

Int. J. Environ. Sci. Technol.

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The effects of different heavy metals (copper and mercury), cationic surfactants cetylpyridinium chloride, anionic surfactant sodium dodecylbenzenesulfonate and the chemistry of the solution (pH value) on the adsorption of three selected phenolic compounds (2, 4-Dichlorophenol, 2, 4-Dinitro-phenol and 2, 4-Dimethyphenol) on sediment were studied. Results indicated that in the sediment-water system with phenolic compounds: (1) all of the data could be simulated by Freundlich equation; (2) the experiments studying pH effects showed that the adsorption capacity of 2, 4-Dichlorophenol and 2, 4-Dimethyphenol were quite potentia Hydrogenii dependent and increased with decrease in potentia Hydrogenii, while 2, 4-Dinitrophenol followed the different trend; (3) As the concentration increased from 0 to 0.2 mM for Cu 2? , the Freundlich capacity coefficient constant varied from 62.84 to 325.1 for 2, 4-Dichlorophenol, from 13.1 to 82.179 for 2, 4-Dinitrophenol and from 29.433 to 7.976 for 2, 4-Dimethyphenol, respectively. The Freundlich capacity coefficient constant of 2, 4-Dichlorophenol, 2, 4-Dinitrophenol and 2, 4-Dimethyphenol varied from 62.84 and 421.43, 13.1 and 138.1, 29.433 and 1.381, respectively, with concentration of Hg 2? increased from 0 to 0.04 mM, respectively; (4) the adsorption of 2, 4-Dichlorophenol and 2, 4-Dimethyphenol were accentuated by cetylpyridinium chloride but suppressed by sodium dodecylbenzenesulfonate, whereas the adsorption of 2, 4-Dinitrophenol on sediment was enhanced by both cationic and anionic surfactants, effects that are consistent with electrostatic and hydrophobic interactions among ionic surfactants, phenolic compounds and sediment. The results are believed to provide a useful insight into describing the transport and fate of phenolic compounds in natural environments.

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Section: Methodsmentioning

confidence: 99%

Effect of heavy metals and surfactants on the adsorption of phenolic compounds on sediment

Gao

Zhang

Liu

et al. 2012

Int. J. Environ. Sci. Technol.

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“…Above pH PZC of silica, the adsorption of cationic surfactants on SiO 2 is believed to compose of two steps: at low concentration, individual surfactant adsorbs on negatively charged surface site mainly by coulombic attraction; then, with increase in concentration, more surfactants migrate to the surface and form hemimicelles at the solid/liquid interface through the hydrophobic interactions between alkyl chains of the surfactants melcules (53)(54)(55)(56)(57)(58). Therefore, the interaction between DTAB and the particles favors the partition of silica particles into the dextran-rich phase.…”

Section: Dtabmentioning

confidence: 99%

Aqueous Biphase Extraction for Processing of Fine Coal

Osseo‐Asare¹,

Zeng²

2002

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EXECUTIVE SUMMARYThe objective of this research project is to develop an aqueous biphase extraction process for the treatment of fine coals. Aqueous biphase extraction is an advanced separation technology that relies on the ability of an aqueous system consisting of a water-soluble polymer and another component, e.g., another polymer, an inorganic salt, or a nonionic surfactant, to separate into two immiscible aqueous phases. The principle behind the partition of solid particles in aqueous biphase systems is the physicochemical interaction between the solid surface and the surrounding liquid solution. In order to remove sulfur and mineral matter from fine coal with aqueous biphasic extraction, it is necessary to know the partitioning behavior of coal, as well as the inorganic mineral components. Therefore, in this research emphasis was placed on the partitioning behavior of fine coal particles as well as model fine inorganic particles in aqueous biphase systems.In the polyethylene glycol (PEG)/salt/H 2 O system, it was found that pyrite partition was highly dependent upon pH conditions: at high pH the particles preferred the salt-rich (bottom) phase, while they moved to the polymer-rich (top) phase at low pH. This behavior is attributable to the different surface oxidation products associated with the pH variations: formation of FeOOH in alkaline solution, and a hydrophobic iron-deficient product (Fe 1-x S 2 ) in acidic environment. The partitioning behavior of oxide particles (e.g., Al 2 O 3 , Fe 2 O 3 , SiO 2 , TiO 2 ) in the PEG/Na 2 SO 4 /H 2 O system indicated that, in the absence of polymer-solid interaction, the surface hydrophilic/hydrophobic properties determined solid partition; otherwise, the specific polymer-solid interaction dominated the distribution of the solid particles.Aside from the polymer/salt aqueous biphase systems, the partitioning behavior of hematite and silica was also investigated in polymer/polymer (PEG/dextran) and polymer/nonionic surfactant (Triton X-100 (TX100)/dextran) systems. In these systems interaction between the phase components and the solid surface played an important role in determining the solids distribution. For both biphase systems, hematite stayed in the bottom dextran-rich phase, which was attributable to the strong interaction between dextran and ferric oxide. However, the partitioning behavior of silica was found to be pHdependent. At low pH the particles preferred the top phase; with increase in pH, the solids gradually moved to the interface, then to the bottom phase and they transferred back to the top phase again at very high pH. The results were attributed to the competition between dextran/SiO 2 and TX100/SiO 2 or dextran/SiO 2 and PEG/SiO 2 interactions.Surfactant addition also offers an important way to change the surface chemistry of a solid. In the PEG/salt/H 2 O system, it is found that only surfactants adsorbed chemically on the solid surfaces had a significant influence on solid distribution, e.g., xanthate/pyrite and oleate/hematite. In contrast, i...

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“…However, surfactants may also retard the transport of contaminants due to the partitioning of contaminants to an adsorbed surfactant phase Ž . Park and Jaffe, 1993;Monticone et al, 1994;Sun et al, 1995 . Furthermore, surfactantś can increase desorption rate constants of contaminants, presumably by inducing swelling Ž .…”

Section: žmentioning

confidence: 99%

“…Sorption and transport of PAH can be affected by surfactants due to admicellar sorption, which is the partitioning of components between an aqueous phase and an Ž adsorbed surfactant phase Valsaraj, 1989;Park and Jaffe, 1993;Monticone et al, 1994;Noordman et al, 1998 . The occurrence of admicellar sorption in the column experiments was apparent from the retardation factors reported in Table 1 for Ž .…”

Section: Admicellar Sorptionmentioning

confidence: 99%

Facilitated transport of a PAH mixture by a rhamnolipid biosurfactant in porous silica matrices

Noordman¹,

Bruining²,

Wietzes³

et al. 2000

Journal of Contaminant Hydrology

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Ž. The facilitated transport of a mixture of three polycyclic aromatic hydrocarbons PAH Ž . naphthalene, fluorene, and phenanthrene by a rhamnolipid biosurfactant was determined with silica, octadecyl-coated silica, and humic acid-coated silica columns. The retardation factors for Ž . the contaminants in the absence of rhamnolipid ranged from 1.8 naphthalene with silica to 708 Ž . phenanthrene with octadecyl-coated silica . The retardation factors for phenanthrene were up to eightfold lower in the presence of 500 mgrl rhamnolipid compared to the situation where no rhamnolipid was present. The facilitated transport of the contaminants in the presence of rhamnolipid could be predicted by accounting for sorption, solubilization and admicellar sorption. In the octadecyl-coated matrix, transport of fluorene and phenanthrene was enhanced even in the Ž . presence of sub-micellar solution of rhamnolipid 20 mgrl , showing that adsorbed surfactant reduced the affinity of these compounds to this stationary phase. Linear free-energy relations Ž . LFERs indicated that the matrix-water, micelle-water, and admicelle-water partitioning constants for PAH were correlated with their 1-octanol-water partitioning constants. These correlations were used to simulate the facilitated transport of contaminants of varying hydrophobicity by a surfactant. It was concluded that surfactants have the greatest transport facilitating effect on the more hydrophobic components. The effectiveness of surfactants for enhancing removal of the less Ž . hydrophobic compounds log K -3.4 may considerably be reduced due to admicellar sorption.

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Coadsorption of 2-Naphthol and Cetylpyridinium Chloride at a Silica/Water Interface in Relation with the Micellar Solubilization Effect

Cited by 56 publications

References 0 publications

Effect of heavy metals and surfactants on the adsorption of phenolic compounds on sediment

Effect of heavy metals and surfactants on the adsorption of phenolic compounds on sediment

Aqueous Biphase Extraction for Processing of Fine Coal

Facilitated transport of a PAH mixture by a rhamnolipid biosurfactant in porous silica matrices

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