Use of Organoclays in Pollution Abatement

Xu, Shihe; Sheng, Guangyao; Boyd, Stephen A.

doi:10.1016/s0065-2113(08)60052-8

Cited by 173 publications

(99 citation statements)

References 86 publications

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“…Organoclays effectively minimized the impact of phenolic wastes on cement hydration [11]. The study on organoclays as waste containment barriers for pollutant attenuation showed that they were very attractive alternatives to the conventional clay liners [12,13]. Increasing the sorption capacity of the earthen liner effectively reduces the contaminant advection velocity and the rate of solute diffusion during transient solute transport without requiring an increase in liner thickness [14,15].…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Organoclays for Use in Landfill Liners

Jhamnani¹,

Singh²

2009

TOWMJ

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Organoclay obtained from two constituents' coco-dimethyl benzyl ammonium chloride, and bentonite was used in this study to prepare five admixtures, by varying the amount of organoclay, natural soil, and bentonite. Laboratory experiments were conducted on these admixtures with the objective of identification and assessment of their potential for use in landfill liners. The admixtures had the organoclay ranging from 10 to 25%, and bentonite in the range of 0 to 20%. The admixtures prepared were evaluated by conducting laboratory sorption tests and permeability tests for the determination of retardation coefficient, and hydraulic conductivity. Permeability tests were conducted using consolidation permeameter. Total Organic Carbon (TOC) was determined using TOC Analyzer. Admixture with higher percentage of organoclay exhibits higher organic sorption capacity. Retardation coefficient of the admixtures was determined by curve fitting the experimental data of sorption tests to fit to Freundlich (nonlinear) sorption isotherm. One-dimensional transport simulations were performed to evaluate completely the effectiveness of these materials for use as landfill liner and to develop design charts for determining required liner thickness.

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Section: Introductionmentioning

confidence: 99%

Evaluation of Organoclays for Use in Landfill Liners

Jhamnani¹,

Singh²

2009

TOWMJ

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“…19) It has been recognized that the CEC is a key factor to determine many important properties of smectites and their intercalation compounds. 20) The variation of CEC has been used to control the distances of adjacent interlayer cations, resulting in the controlled molecular sieving functions 21), 22) of pillared clays and photoprocesses of adsorbed cationic dyes. 23)- 25) While smectites with varied CEC are available, other characteristics such as the composition, and particle size also vary to potentially affect the properties of smectites and their intercalation compounds.…”

Section: Introductionmentioning

confidence: 99%

Preparation of hectorite-like swelling silicate with controlled layer charge density

Ogawa

Matsutomo

Okada

2008

J. Ceram. Soc. Japan

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Smectite like layered silicates with cation exchange capacity ranges from 60 to 90 mequivalent/100g clay were synthesized from LiF, Mg(OH)2 and colloidal silica. The controlled cation exchange capacity achieved by changing the composition of the starting mixture (namely the added LiF amount) successfully influenced the nanostructures of intercalation compounds prepared by the ion exchange with dioctadecyldimethylammonium ion.

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“…The effect of pH is probably due to the increased polarity of the humic material and the electrostatic interaction of cationic pesticide with soil particles at higher pH. High-selectivity sorption of organic cation by soils or minerals has been reported (Xu et al, 1997). A more polar humic substance would have a lower affinity for hydrophobic compounds.…”

Section: Effect Of Phmentioning

confidence: 99%

Imidacloprid adsorption by soils treated with humic substances under different pH and temperature conditions

Ping¹,

Zhang²,

Zhu³

et al. 2010

Afr. J. Biotechnol.

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The mobility of a pesticide in soil is determined by the extent and strength of sorption, which is influenced by either the existing soil humus or exogenous humic substances. Exogenous humic acids (HAs) were added to soil to enhance the amount of soil organic carbon (SOC) by 2.5, 5.0 and 10.0 g kg ) when the soil solution pH was 6.0. However adsorption of imidacloprid in the HA treatment was higher than the controls. Imidacloprid adsorption was usually higher under lower pH and/or lower temperature at same condition. Imidacloprid sorption fitted the Freundlich isotherm, indicating that exogenous humic substances influenced adsorption of imidacloprid, which in turn was affected by environmental conditions such as pH and temperature. Thus, exogenous HA can be used to control the mobility of soil pesticide under appropriate conditions to decrease pesticide pollution diffusion and probably increase effectiveness of pesticides.

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Use of Organoclays in Pollution Abatement

Cited by 173 publications

References 86 publications

Evaluation of Organoclays for Use in Landfill Liners

Evaluation of Organoclays for Use in Landfill Liners

Preparation of hectorite-like swelling silicate with controlled layer charge density

Imidacloprid adsorption by soils treated with humic substances under different pH and temperature conditions

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