On applying the ideal adsorbed solution theory to multicomponent adsorption equilibria of dissolved organic components on activated carbon

Seidel, Andreas; Gelbin, D.

doi:10.1016/0009-2509(88)87128-8

Cited by 101 publications

(39 citation statements)

References 21 publications

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“…6(b)), the behaviour of the experimental isotherms is represented satisfactorily, although a small systematic deviation between theory and experiment is still observed. Seidel et al (1986) and Seidel and Gelbin (1988) in their work with organic solutes and activated carbon found considerable deviations between measured and predicted isotherms by using the IAS theory. These authors concluded that chemical interactions between solutes in the adsorbed phase could be responsible for those deviations and that the IAS theory is not suitable in these cases.…”

Section: Bisolute Isothermsmentioning

confidence: 91%

“…However, methods based solely on single solute equilibrium data often fail to calculate experimental mixture equilibria accurately (Seidel and Gelbin, 1988) and so several equations, for example those of Fritz and Schluender (1974), Crittenden and Weber (1978), Sheindrof et al (1982) and Khan et al (1996Khan et al ( , 1997, with additional adjustable parameters have been proposed. But, as the number of solutes in the mixture increases, the number of additional parameters to be determined from the experimental mixture equilibria becomes higher and the use of these equations becomes impracticable.…”

Section: Introductionmentioning

confidence: 99%

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Adsorption of Phenolic Compounds from Water on Activated Carbon: Prediction of Multicomponent Equilibrium Isotherms using Single-Component Data

Leitão

Serrão

2005

Adsorption

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Batch-type experiments were carried out to obtain equilibrium isotherms for the adsorption of phenol and m-cresol in aqueous solutions on activated carbon. Single solute systems, at 20 and 40 • C, were tested for Langmuir, Freundlich and Sips adsorption isotherms in the range of concentrations up to 200 mg/L. Equilibrium data were more closely followed by the Freundlich and Sips equations for all cases. Adsorption isotherms for bisolute systems at 20 • C, with two different initial concentrations of phenol and m-cresol, were predicted solely on the basis of single solute equilibrium parameters by using the equations of Butler and Ockrent and the IAS theory. The best agreement with the experimental loading values was afforded with the IAS theory based on Sips isotherm for pure compounds. However, this theory is found to be not able to predict with success the binary isotherms in this work where significant displacement of one solute by the other is observed. Chemical interactions in the adsorbed phase, estimated by a modified Butler-Ockrent model, can be responsible for this lack of success of the conventional IAS theory. The predictions based on the IAS theory are compared with the results of some empirical models.

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Section: Bisolute Isothermsmentioning

confidence: 91%

Section: Introductionmentioning

confidence: 99%

Adsorption of Phenolic Compounds from Water on Activated Carbon: Prediction of Multicomponent Equilibrium Isotherms using Single-Component Data

Leitão

Serrão

2005

Adsorption

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“…In this case, the disagreement between experimental and predicted adsorption capacities may originate from a non-respect of model's hypothesis. Seidel and Gelbin (1988) notice that low solubility compounds may involve the non-ideality of the solution. Thus, the presence of two solutes of low solubility (simazine and atrazine) may induce a shift from the solution's ideality more important than with other pesticides.…”

Section: Competitive Adsorption Of Pesticidesmentioning

confidence: 99%

Multicomponent Adsorption of Pesticides onto Activated Carbon Fibers

2005

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The adsorption equilibria of pesticides and metabolites (atrazine, deethylatrazine, deisopropylatrazine and simazine) are studied onto activated carbon fibers -ACF-with a broad pore size distribution (32% mesopore volume, 68% micropore volume). Mono-and multi-component isotherms have been determined for low concentrations, from 0.23 × 10 −6 to 9.52 × 10 −6 mol L −1 . Single solute isotherms, modeled by Freundlich and Langmuir models, tend to prove the influence of the adsorbate's solubility in the adsorption capacity of activated carbon fibers. Binary solute isotherms confirm the strong influence of pesticide solubility on the competitive adsorption mechanism: the competition is higher in the case of adsorbates of different solubilities (atrazine and DEA or DIA for example). Multicomponent experimental data were modeled by extended Langmuir-based equations and the Ideal Adsorbed Solution theory. Whereas the first ones failed to model accurately binary adsorption due to restrictive hypothesis, the IAS model showed a good agreement between experimental and predicted data. It emphasised also the difficulty in satisfying the hypothesis of the model in the case of highly adsorbed compounds. Finally, the simultaneous adsorption of atrazine and NOM (in a natural water, DOC = 18.2 mg L −1 ) shows no adsorption competition effects between natural organic matter and atrazine. This is due to the presence of secondary micropores (0.8-2 nm) and mesopores in the ACF, which limit a pore blockage phenomenon by NOM.

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“…This error function (15) was used previously by a number of researchers in the field (16). It is similar in some respects to a geometric mean error distribution modified according to the number of degrees of freedom of the system: …”

Section: Marquardt's Percent Standard Deviation (Mpsd)mentioning

confidence: 99%