Chromatographic determination of the physico-chemical parameters of adsorption on active carbons

Grajek, H.; Neffe, S.; Witkiewicz, Zygfryd

doi:10.1016/s0021-9673(01)96241-7

Cited by 12 publications

(2 citation statements)

References 17 publications

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“…These interactions become notably stronger as the surface becomes more densely covered. In most scenarios, these intermolecular forces allow molecules attached to the solid surface to move relatively freely [99]. Consequently, these molecules must overcome potential barriers arising from the periodic structure of the solid surface and the subsequent periodic fluctuation in adsorption energy [100].…”

Section: Hill and Sips Modelsmentioning

confidence: 99%

Isothermal Remodelling of the Biosorption of Congo Red onto Kaolin

Adamu,

Basirun,

Ismail

et al. 2023

Bioremed Sci Technol Res

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A remodeling analysis was conducted on the sorption isotherm data for Congo Red adsorption onto kaolin using nonlinear regression. (CR) also known as 1-naphthalenesulfonic acid, 3,3′-(4,4′-biphenylenebis(azo)) bis(4-amino-) disodium salt, is a synthetic anionic azo dye widely utilized in various industrial sectors, including rubber, plastic, textiles, paper, and printing. This dye is of significant interest due to its versatile applications and unique chemical properties. To prevent overfitting due to the limited data points, isotherm models with up to three parameters were utilized. Statistical analysis based on error function assessments, including root-mean-square error (RMSE), adjusted coefficient of determination (adjR2), accuracy factor (AF), bias factor (BF), Bayesian Information Criterion (BIC), corrected AICc (Akaike Information Criterion), and Hannan-Quinn Criterion (HQC), revealed that the best performance was achieved by the Freundlich model, followed by the Langmuir and Jovanovic models, which ranked as the top three models.The best isotherm model was found to be the Unilan followed by (descending order) Brouers–Sotolongo, Hill, Sips and Langmuir. The Unilan maximum adsorption capacity, shows large deviation from the experimentally observed value with a large 95% confidence interval, indicating poor fitting parameters despite being the best model based on the error function analysis. The next best model was Brouers–Sotolongo with a maximum adsorption capacity, qmBS of 5.48 mg g-1 (95% confidence interval from 4.791 to 6.172) which agrees with experimental observations. The value of the maximum monolayer adsorption capacity for Congo Red binding to kaolin according to the Langmuir’s parameter qmL was 5.49 mg g-1 (95% Confidence interval from 5.018 to 5.967), while bL (L mg-1), the Langmuir model constants was 0.5 L mg-1 (95% C.I. from 0.285 to 0.710).

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Section: Hill and Sips Modelsmentioning

confidence: 99%

Isothermal Remodelling of the Biosorption of Congo Red onto Kaolin

Adamu,

Basirun,

Ismail

et al. 2023

Bioremed Sci Technol Res

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“…It is well known that the heat of adsorption varies with coverage of the activated carbon surface with adsorbate. At low coverages the heat of adsorption of an adsorbate is very high (approaching the value for chemisorption), whilst at high loadings the heat of adsorption decreases in value (Witkiewicz et al 1991). The heat of adsorption may be related to the strong sorption forces existing between the very active adsorbent sites and the adsorbate.…”

Section: Applications Of Liquid Subcritical and Supercritical Co 2 Amentioning

confidence: 99%

Regeneration of Adsorbents by the Use of Liquid, Subcritical and Supercritical Carbon Dioxide

Grajek

2000

Adsorption Science & Technology

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ABSTRACT:The literature concerning the adsorption and desorption of environmental impurities from adsorbents by means of liquid, subcritical and supercritical carbon dioxide and the author's work on the subject have been reviewed. The influence of the adsorption and desorption temperature, the pressure and the density of the extraction solvent, the solubility of the adsorbate in the extraction solvent, the activation energy for adsorbate desorption and the particle size of the adsorbent on the adsorbate desorption efficiency by this method were discussed.

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