Journal of Food, Agriculture and Environment

Kinetic, equilibrium and isotherm modeling for the removal of basic dye from aqueous solutions onto treated apricot stone

Author(s):

Moussa Abbas ¹*, Tounsia Aksil ¹,  Mohamed Trari ²

Recieved Date: 2018-08-06, Accepted Date: 2018-09-28

Abstract:

The preparation of activated carbon from apricot stone (ASAC) with H₃PO₄ and its ability to remove the methylene blue (MB) used in the textile industry from aqueous solutions are reported in this study. The FTIR spectroscopy is used to get information on interactions between the adsorbent and MB. A series of contact time experiments were undertaken in stirred batch adsorber to assess the effect of the system variables. The results were discussed and showed that ASAC can be successfully used in the wastewater treatment. A comparison of two models on the overall adsorption rate showed that the kinetic of adsorption was better described by the pseudo-second order model. The adsorption isotherms of MB onto ASAC are determined and correlated with common isotherms equations. The smaller RMSE values obtained for the Langmuir and Elovich models indicate the better curves fitting, the monolayer adsorption capacity of MB was 46.03 mg.g^-1 at 25^oC and 88.50 mg g^-1 at 70^oC and pH 10. The thermodynamic parameters indicate spontaneous and endothermic nature of the adsorption process. The positive entropy (∆S°) shows that the randomness in decreases at the solid-solution interface during the MB adsorption onto ASAC, indicating that some structural exchange may occur among the active sites of the adsorbent and MB ions.

Keywords:

Apricot stone, methylene blue, isotherm, adsorption, thermodynamic

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Journal: Journal of Food, Agriculture and Environment
Year: 2018
Volume: 16
Issue: 3&4
Category: Environment
Pages: 80-89

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