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Immersion enthalpy and the constants of Langmuir model in the 3-chloro phenol adsorption on activated carbon

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Abstract

The adsorption process of 3-chloro phenol from aqueous solution on a activated carbon prepared from African palm stone and which presents a specific surface area of 685 m2 g−1, a greater quantity of total acid groups and a pHPZC of 6.8 is studied. The adsorption isotherms are determined at pH values of 3, 5, 7, 9 and 11. The adsorption isotherms are fitted to the Langmuir model and the values of the maximum quantity adsorbed that are between 96.2 and 46.4 mg g−1 are obtained along with the constant KL with values between 0.422 and 0.965 L mg−1. The maximum quantity adsorbed diminishes with the pH and the maximum value for this is a pH of 5. The immersion enthalpies of the activated carbon in a 3-chloro phenol solution of constant concentration, of 100 mg L−1, are determined for the different pH levels, with results between 37.6 and 21.2 J g−1. Immersion enthalpies of the activated carbon in function of 3-chloro phenol solution concentration are determined to pH 5, of maximum adsorption, with values between 28.3 and 38.4 J g−1, and by means of linearization, the maximum immersion enthalpy is calculated, with a value of 41.67 J g−1. With the results of the immersion enthalpy, maximum quantity adsorbed and the constant KL, establish relations that describe the adsorption process of 3-chloro phenol from aqueous solution on activated carbon.

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Acknowledgements

The authors wish to thank the Master Agreement established between the Universidad de los Andes and the Universidad Nacional de Colombia and the Memorandum of Understanding entered into by the Departments of Chemistry of both Universities.

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Authors and Affiliations

  1. Departamento de Química, Facultad de Ciencias, Universidad Nacional de Colombia, Bogotá, Colombia

    Liliana Giraldo

  2. Grupo de Investigación en Sólidos Porosos y Calorimetría, Departamento de Química, Facultad de Ciencias, Universidad de Los Andes, Bogotá, Colombia

    Juan Carlos Moreno

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  1. Liliana Giraldo
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  2. Juan Carlos Moreno
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Correspondence to Juan Carlos Moreno.

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Giraldo, L., Moreno, J.C. Immersion enthalpy and the constants of Langmuir model in the 3-chloro phenol adsorption on activated carbon. J Therm Anal Calorim 100, 695–700 (2010). https://doi.org/10.1007/s10973-009-0192-3

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  • DOI: https://doi.org/10.1007/s10973-009-0192-3

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