Sorption of hydrophobic organic compounds onto organoclays

Lee, S.Y.; Kim, S.J.; Chung, Sang Ki; Jeong, Chanseok

doi:10.1016/j.chemosphere.2003.11.007

Cited by 87 publications

(51 citation statements)

References 13 publications

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“…The organic surfactant-modified clays, or organoclays, have attracted much interest because of their wide applications in the environmental and material sciences [1][2][3][4][5][6]. In the past two decades, cation surfactant-modified montmorillonites may have been the most widely studied organoclays.…”

Section: Introductionmentioning

confidence: 99%

Preparation and characterization of zwitterionic surfactant-modified montmorillonites

Zhu

Qing

Wang

et al. 2011

Journal of Colloid and Interface Science

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Section: Introductionmentioning

confidence: 99%

Preparation and characterization of zwitterionic surfactant-modified montmorillonites

Zhu

Qing

Wang

et al. 2011

Journal of Colloid and Interface Science

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“…Various adsorbents including activated carbon (Wang and Liu, 2001;Bembnowska et al, 2003;Matsui et al, 2003), natural materials such as sugar cane bagasse, green coconut shells, chitin, and chitosan (Crisafully et al, 2008;Li et al, 2009), organoclays (Lee et al, 2004) and DNA hydrogel beads (Liu et al, 2005) have been reported for POPs removal. However, it is difficult to remove trace level POPs near the environmental levels by these adsorbents.…”

Section: Introductionmentioning

confidence: 99%

Removal of persistent organic pollutants from micro-polluted drinking water by triolein embedded absorbent

Liu

Jia

et al. 2009

Bioresource Technology

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a b s t r a c tA new biomimetic absorbent, cellulose acetate (CA) embedded with triolein (CA-triolein), was prepared and applied for the removal of persistent organic pollutants (POPs) from micro-polluted aqueous solution. The comparison of CA-triolein, CA and granular activated carbon (GAC) for dieldrin removal was investigated. Results showed that CA-triolein absorbent gave a lowest residual concentration after 24 h although GAC had high removal rate in the first 4 h adsorption. Then the removal efficiency of mixed POPs (e.g. aldrin, dieldrin, endrin and heptachlor epoxide), absorption isotherm, absorbent regeneration and initial column experiments of CA-triolein were studied in detail. The linear absorption isotherm and the independent absorption in binary isotherm indicated that the selected POPs are mainly absorbed onto CA-triolein absorbent by a partition mechanism. The absorption constant, K, was closely related to the hydrophobic property of the compound. Thermodynamic calculations showed that the absorption was spontaneous, with a high affinity and the absorption was an endothermic reaction. Rinsing with hexane the CA-triolein absorbent can be regenerated after absorption of POPs. No significant decrease in the dieldrin removal efficiency was observed even when the absorption-regeneration process was repeated for five times. The results of initial column experiments showed that the CA-triolein absorbent did not reach the breakthrough point at a breakthrough empty-bed volume (BV) of 3200 when the influent concentration was 1-1.5 lg/L and the empty-bed contact time (EBCT) was 20 min.

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“…Phyllosilicates are layered silicates in which the SiO 4 tetrahedra are linked together in infinite two-dimensional sheets and are condensed with layers of AlO 6 or MgO octahedra in the ratio 2:1 or 1:1. The negatively charged layers attract positive cations (e.g.…”

Section: Introductionmentioning

confidence: 99%

“…Their large cation exchange capacities enable them to adsorb heavy metals and also to be modified with quaternary salts 1 including cationic surfactants. 2 One of the exceptional properties of such prepared organo-phyllosilicates is their ability to sorb hydrophobic organic contaminants, such as chlorinated phenols, 3,4 perchlorethylene, naphtalene and phenanthrene, [5][6][7] aniline, 8 phenol 9 etc. The retention of inorganic oxyanions, such as chromate, nitrate, and arsenate, on organo-kaolinite 10 and organo-clinoptilolite 11 has been studied recently, as well.…”

Section: Introductionmentioning

confidence: 99%

A physico-chemical study of the cationic surfactants adsorption on montmorillonite

Praus¹,

Turicová²

2007

J. Braz. Chem. Soc.

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O objetivo deste trabalho é o estudo da adsorção de brometo de cetiltilmetilamônio (CTA) e de cloreto de cetilpiridínio (CP) em argilas do tipo montorilonita (MMT) ricas em sódio. Um método isotacoforético (ITP) específico foi desenvolvido visando à determinação rápida e simultânea dos surfatantes catiônicos (CS) adsorvidos. A fim de reduzir os limites de detecção, o método isotacoforético foi conjugado com a técnica de eletroforese capilar. Para determinar o arranjo dos surfatantes catiônicos (CS) adsorvidos na superfície das argilas foi efetuada a avaliação do balanço molar entre os surfatantes e os cátions metálicos juntamente com as isotermas de adsorção. A maior adsorção do CP comparada a do CTA pode ser entendida não só pela ação das forças eletrostáticas, mas também por outras interações, tais como, interação hidrofóbica cauda-cauda e/ou interações entre anéis piridínicos formando bicamadas incompletas e/ou monocamadas condensadas, respectivamente.The adsorption of cetyltrimethylammonium (CTA) bromide and cetylpyridinium (CP) chloride on Na + -rich montmorillonite (MMT) was studied. An ad hoc isotachophoretic (ITP) method was developed for the simultaneous and rapid determination of the cationic surfactants (CSs) adsorbed. In order to decrease the detection limits, ITP was on-line coupled with capillary zone electrophoresis. Adsorption data were analysed by their fitting with adsorption isotherms. The adsorption of CP is well described by the Langmuir isotherm. It indicates the monolayer arrangement of CP on the MMT surface. In case of the CTA data, the best fitting LangmuirFreundlich model with the power constant r<1 was found. It can be explained by the CTA interactions because of its intercalation into the MMT interlayer space.

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Sorption of hydrophobic organic compounds onto organoclays

Cited by 87 publications

References 13 publications

Preparation and characterization of zwitterionic surfactant-modified montmorillonites

Preparation and characterization of zwitterionic surfactant-modified montmorillonites

Removal of persistent organic pollutants from micro-polluted drinking water by triolein embedded absorbent

A physico-chemical study of the cationic surfactants adsorption on montmorillonite

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