A Survey of Sorption Relationships for Reactive Solutes in Soil

Travis, Clayton; Etnier, E.L.

doi:10.2134/jeq1981.00472425001000010002x

Cited by 233 publications

(98 citation statements)

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“…Some works on this subject have been reported in previous reviews (3,4,33,34). From these and others cited below, it appears that adsorption rates are generally greater than desorption rates; for adsorption, equilibrium is often reached within 1 to 24 hr although it can take longer for some systems because other phenomena, such as chemical fixation, are acting after adsorption has been achieved.…”

Section: Kinetic Characteristicsmentioning

confidence: 93%

Adsorption of Organic Chemicals in Soils

Calvet¹

1989

Environmental Health Perspectives

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This paper presents a review on adsorption of organic chemicals on soils sediments and their constituents. The first part of this review deals with adsorption from gas and liquid phases and gives a discussion on the physical meaning of the shape of adsorption isotherms. Results show that no general rules can be proposed to describe univocally the relation between the shape of isotherms and the nature of adsorbateadsorbent system. Kinetics of adsorption is discussed through the description of various models.Theoretical developments exist both for the thermodynamics and the kinetics of adsorption, but there is a strong need for experimental results. Possible adsorption mechanisms are ion exchange, interaction with metallic cations, hydrogen bonds, charge transfers, and London-van der Waals dispersion forces/ hydrophobic effect. However, direct proofs of a given mechanism are rare. Several factors influence adsorption behavior. Electronic structure of adsorbed molecules, properties of adsorbents, and characteristics of the liquid phase are discussed in relation to adsorption. Such properties as water solubility, organic carbon content of adsorbing materials, and the composition of the liquid phase are particularly important. Evaluation of adsorption can be obtained through either laboratory measurements or use of several correlations. Adsorption measurements must be interpreted, taking into account treatment of adsorbent materials, experimental conditions, and secondary phenomena such as degradations. Correlations between adsorption coefficients and water-octanol partition coefficient or water solubility are numerous. They may be useful tools for prediction purposes. Relations with transport, bioavailability, and degradation are described.

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Section: Kinetic Characteristicsmentioning

confidence: 93%

Adsorption of Organic Chemicals in Soils

Calvet¹

1989

Environmental Health Perspectives

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“…Dubinin-Radushkevich isotherm model [19] is an empirical adsorption model that is generally applied to express adsorption mechanism with Gaussian energy distribution onto heterogeneous surfaces [20].…”

Section: Dubinin-radushkevichmentioning

confidence: 99%

Modelling and Interpretation of Adsorption Isotherms

Ayawei

Ebelegi

Wankasi

2017

Journal of Chemistry

2,046

885

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The need to design low-cost adsorbents for the detoxification of industrial effluents has been a growing concern for most environmental researchers. So modelling of experimental data from adsorption processes is a very important means of predicting the mechanisms of various adsorption systems. Therefore, this paper presents an overall review of the applications of adsorption isotherms, the use of linear regression analysis, nonlinear regression analysis, and error functions for optimum adsorption data analysis.

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“…The linearity of Langmiur adsorption isotherms developed using earths from smectite-rich sediments from volcanic clays showed R 2 value ranging from 0.911 ± 0.04 for Budadiri and Siron clays to 0.999 ± 0.04 for Mutufu and Chelel clays and the high level of linearity observed has been explained in terms of capacity to adsorb the amine because they had more acid sites on which the amine could adsorb than kaolinite-rich clays. So the clays could not reach their saturation points easily to involve the adsorbate molecules in competition which leads to steric interactions between the adsorbed and free molecules in solutions [37].…”

Section: Surface Aciditymentioning

confidence: 99%

Distinguishing Kaolinites and Smectite Clays from Central and Eastern Uganda Using Acidity, pH, Colour and Composition

Mukasa-Tebandeke¹,

Ssebuwufu²,

Nyanzi³

et al. 2015

AJAC

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The Langmuir isotherms of 1-aminobutane in isohexane slurries showed increase in clay acidity with increase in concentration of mineral acid used to leach the clay as well as the temperature at which the clay was thermally activated prior to experimentation involving adsorption of 1-aminobutane. The values of acidity for Central Uganda were low ranging from 0.07 mol/g to 0.32 mol/g yet those for clays from Eastern Uganda were high ranging from 0.1 mol/g to 1.85 mol/g. Based on acidity, pH, elemental and mineral compositions, the clays from Central Uganda were found to be kaolinites or halloysites, yet Eastern Uganda clays were resolved to contain nontronite and kaolinite.

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A Survey of Sorption Relationships for Reactive Solutes in Soil

Cited by 233 publications

References 0 publications

Adsorption of Organic Chemicals in Soils

Adsorption of Organic Chemicals in Soils

Modelling and Interpretation of Adsorption Isotherms

Distinguishing Kaolinites and Smectite Clays from Central and Eastern Uganda Using Acidity, pH, Colour and Composition

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