Benzene Transport through Landfill Liners Containing Organophilic Bentonite

Smith, James A.; Jaffé, Peter R.

doi:10.1061/(asce)0733-9372(1994)120:6(1559)

Cited by 106 publications

(78 citation statements)

References 19 publications

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“…This was anticipated due to the low organic carbon content naturally present in the unmodified clay soil, and is consistent with previously measured values of K d for the sorption of benzene to bentonite (29). In contrast, the sorption of benzene to activated carbon was strong and highly nonlinear and exhibited the behavior of an adsorptive media.…”

Section: Discussionsupporting

confidence: 90%

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Organoclay Sorption of Benzene as a Function of Total Organic Carbon Content

Redding

Burns

Upson

et al. 2002

Journal of Colloid and Interface Science

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Section: Discussionsupporting

confidence: 90%

“…This is consistent with literature data that show sorption of benzene to bentonite was quite weak (29). Figure 1 shows the results of benzene sorption to activated carbon.…”

Section: Sorption Isothermssupporting

confidence: 91%

Organoclay Sorption of Benzene as a Function of Total Organic Carbon Content

Redding

Burns

Upson

et al. 2002

Journal of Colloid and Interface Science

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“…Organophilic smectites are used as an adsorbent of organic pollutants. It is proposed to regard the organophilic interlayer as an organic solvent (2)(3)(4)(5)(6). Generally, the adsorption properties of smectites modified by alkylammonium increase with the length of the alkylsubstituents.…”

Section: Introductionmentioning

confidence: 99%

Organic Pillared Clays

Meier

Nueesch

Madsen³

2001

Journal of Colloid and Interface Science

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“…The impressive sorptive capabilities of organoclays makes them potentially useful in a variety of environmental applications and technologies (Beall, 1985;Harper and Purnell, 1990;Boyd et al, 1991;Brixie and Boyd, 1994;Smith and Jaffe, 1994;Wagner et al, 1994;Gullick et al, 1996;Li et al, 1996;Xu et al, 1997). Examples of applications include: as extenders for activated carbons for water treatment (Beall, 1985), as components of clay barriers to immobilize dissolved organic contaminants and to prevent hydraulic failure of the barrier when exposed to concentrated or pure organic liquids (Smith and Jaffe, 1994;Li et al, 1996;Gullick et al, 1996), and as adsorbents for airborne organic contaminants (Harper and Purnell, 1990).…”

Section: Introductionmentioning

confidence: 99%

“…Examples of applications include: as extenders for activated carbons for water treatment (Beall, 1985), as components of clay barriers to immobilize dissolved organic contaminants and to prevent hydraulic failure of the barrier when exposed to concentrated or pure organic liquids (Smith and Jaffe, 1994;Li et al, 1996;Gullick et al, 1996), and as adsorbents for airborne organic contaminants (Harper and Purnell, 1990). The high stability and sorptive capabilities of organoclays also suggest uses in management and remediation of contaminant plumes in the subsurface.…”

Section: Introductionmentioning

confidence: 99%

Polarity Effect on Dichlorobenzene Sorption by Hexadecyltrimethylammonium-Exchanged Clays

Sheng

Boyd

2000

Clays and clay miner.

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Abstract~Sorptive properties of organoclays may be greatly influenced by the physicochemical properties of organic sorbates. Hexadecyltrimethylammonium(HDTMA) clays were prepared using a highcharge smectite (HDTMA-SAz-1), a low-charge smectite (HDTMA-SWy-2), and an illite (HDTMA-ILL). The resultant organoclays were used to sorb aqueous phase 1,2-dichlorobenzene (o-DCB), 1,3-dichlorobenzene (m-DCB), and 1,4-dichlorobenzene (p-DCB). Sorptive characteristics of these compounds were determined by their molecular polarities (o-DCB > m-DCB > p-DCB) and the HDTMA-clay interlayer distance. HDTMA-ILL was used for comparison to HDTMA-SAz-I and HDTMA-SWy-2. All dichlorobenzene isomers were directly intercalated in the interlayers of HDTMA-SAz-1, causing interlayer expansion, o-DCB and m-DCB were not intercalated in the interlayers of HDTMA-SWy-2 at low concentrations, but intercalation occurred at higher concentrations, which caused interlayer expansion. The concentration needed to produce interlayer expansion depended on the solute molecular polarity, hence a higher concentration of m-DCB than o-DCB was required, p-DCB was sorbed primarily by the HDTMA phase on the external surfaces of HDTMA-SWy-2. In the presence of chlorobenzene (CB), p-DCB sorption by HDTMA-SWy-2 is greatly enhanced, owing to the interlayer expansion by CB and a cosolvent effect. Sorption of o-DCB resulted from both direct solvation-type interactions with HDTMA and partitioning into HDTMA. Such sorption results in double-sigmoid isotherms, m-DCB weakly solvates the HDTMA and partitions into the HDTMA, displaying either a donble-sigmoid or a type-III isotherm depending on clay type. p-DCB lacks ability to solvate HDTMA and partitions into HDTMA as its sole mechanism, producing type-III isotherms. HDTMA-clays are potentially effective for treating dichlorobenzene-contaminated wastewater.

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Benzene Transport through Landfill Liners Containing Organophilic Bentonite

Cited by 106 publications

References 19 publications

Organoclay Sorption of Benzene as a Function of Total Organic Carbon Content

Organoclay Sorption of Benzene as a Function of Total Organic Carbon Content

Organic Pillared Clays

Polarity Effect on Dichlorobenzene Sorption by Hexadecyltrimethylammonium-Exchanged Clays

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