Immersion enthalpy and the constants of Langmuir model in the 3-chloro phenol adsorption on activated carbon |
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Authors: | Liliana Giraldo Juan Carlos Moreno |
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Institution: | 1.Departamento de Química, Facultad de Ciencias,Universidad Nacional de Colombia,Bogotá,Colombia;2.Grupo de Investigación en Sólidos Porosos y Calorimetría, Departamento de Química, Facultad de Ciencias,Universidad de Los Andes,Bogotá,Colombia |
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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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