Reconsideration of theoretical basis of Freundlich adsorption isotherm equation

Nakahara, Osamu

doi:10.1080/00380768.1996.10414688

Cited by 3 publications

(2 citation statements)

References 20 publications

(22 reference statements)

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“…This isotherm has been further extended by considering the influence of adsorption sites and the competition between different ions for adsorption on the available sites. Isotherms of this form have been observed for a wide range of heterogeneous surfaces including activated carbon, silica, clays, and polymers (36)(37)(38)(39)(40)(41). The linear form of FI is…”

Section: Freundlich Isotherm (Fi)mentioning

confidence: 96%

Adsorption Characteristics and the Kinetics of the Cation Exchange of Rhodamine-6G with Na+-Montmorillonite

Gemeay

2002

Journal of Colloid and Interface Science

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Section: Freundlich Isotherm (Fi)mentioning

confidence: 96%

Adsorption Characteristics and the Kinetics of the Cation Exchange of Rhodamine-6G with Na+-Montmorillonite

Gemeay

2002

Journal of Colloid and Interface Science

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“…Figures 8 to 15 indicates that in majority of cases a straight line can be drawn for the data in the tests results with a good coefficient of determination (minimum R 2 is 0.8 for Redlich Peterson isotherm). For Freundlich model (the first published adsorption model), the model was shown to theoretically superior for the prediction of mainly metallic ions [8]. The linearized model (Figs 8 and 9) for fitting the data obtained from this study also yielded excellent R 2 (i.e.…”

Section: Resultsmentioning

confidence: 52%

Adsorption of DDT and PCB Using Natural Soil and Carbon Nanotube

Taha

Mobassera

2014

The 9th International Conference "Environmental Engineering 2014"

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Both DDT and PCB are amongst the contaminants quite often being release to the environment. They are not only carcinogen but also very persistent and being able to linger in the environment for a very long time. In addition, they are also very difficult to be cleaned up once once exposed or released to the environment. In this study, both of these contaminants were subjected to adsorption by natural soilcarbon nanotube system. Batch adsorption studies were conducted evaluate the efficiency of a local residual soil with various amounts of multiwalled nanotube (MWNT) to adsorb DDT and PCB in solution. For each set of test, the adsorption equilibrium time was also determined. It was found that the equilibrium time for adsorption of both contaminants were about 22 and 49 hours, respectively for DDT and PCB. As expected, the amounts of the contaminants adsorbed increases as the MWNT contents were increased. The maximum percentage of adsorption were about 90 and 80%, respectively for DDT and PCB for up to 10% of MWNT by weight of the original soil used. The results of the study were also analyzed with respect to the various adsorption isotherms, i.e. Freundlich, Langmuir, Temkin, and Redlich-Peterson. Linearized Langmuir adsorption isotherm showed the best fit for the experimental data for both systems while the linearized Redlich-Peterson was the least fit amongst the isotherms. In addition, it was also found that the linear form of the simple Temkin isotherm was able to fit all adsorption data quite well. Nevertheless all linearized isotherms tested showed sufficient capability to predict the data obtained.

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