Algerian Journal of Engineering Research
Volume 4, Numéro 2, Pages 1-8

Removal Of 2,4-dinitrophenol By Adsorption Onto Activated Carbon Prepared From Date Stones, Kinetic And Isotherm Studies.

Authors : Hayoun Bahdja . Benkhelat Nabila . Bourouina Mustapha . Bourouina-bacha Saliha .

Abstract

The present study deals with the preparation, characterization of an activated carbon (AC) based a lignocellulosic material, date stones (DS) by chemical process using the zinc chloride (ZnCl2) as activating agent that produce a large development of porosity, and its application for adsorption of 2,4-Dinitrophenol (2,4-DNP) from aqueous solution. The surface characteristics of the activated carbon prepared were also studied using the Scanning Electron Microscopy (SEM) and liquid displacement method. Batch studies were performed to evaluate the influence of contact time, initial 2,4-DNP concentration and AC dosage. The experimental data were analysed using Langmuir, Freundlich and Temkin isotherm models. The results of the study indicated that the AC adsorption data are best modelled with the Langmuir isotherm (correlation coefficient R2= 0.998, Average relative error ARE<4.0), and the maximum adsorption capacity was found to be 196.078 mg g-1 at room temperature (25±2°C). The pseudo-first-order, pseudo-second-order and intra-particle diffusion kinetic models were used to modelling the adsorption kinetics. Adsorption reaction data are best fitted by the pseudo-second order kinetics (R2> 0.995, ARE<6.0) for all range 2,4-DNP concentrations. Overall, date stones (DS) offered low-cost adsorbent for the preparation of activated carbon with a high removal capacity for 2,4-DNP from water in less than 2 hours.

Keywords

Adsorption ; activated carbon ; date stones ; 2,4-Dinitrophenol ; isotherm ; kinitic