Effect of acid and alkali treatments of a forest waste,Pinus brutia cones,on adsorption efficiency of methyl green |
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| Authors: | Tahar Mekhalif Khalil Guediri Abdelbaki Reffas Derradji Chebli Abdeltif Amrane |
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| Institution: | 1. Faculté des sciences, Département de Sciences de la Matière, Université 20 aout 1955, Skikda, Algérie;2. Laboratoire de Matériaux Inorganiques (LMI), Faculté de sciences, Université Mohamed Boudiaf, M'sila, Algérie;3. Département de Génie des Procédés, Laboratoire de Génie des Procédés Chimiques (LGPC), Faculté de Technologie, Université Ferhat Abbas, Sétif, Algérie;4. Ecole Nationale Supérieure de Chimie de Rennes, Université de Rennes 1, CNRS, UMR 6226, Rennes, France;5. Université′ Européenne de Bretagne, Bd Laennec, Rennes, France |
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| Abstract: | The removal of methyl green (MG) dye from aqueous solutions using acid- or alkali-treated Pinus brutia cones (PBH and PBN) waste was investigated in this work. Adsorption removal of MG was conducted at natural pH, namely, 4.5 ± 0.10 for PBH and near 4.8 ± 0.10 for PBN. The pseudo-second-order model appeared to be the most appropriate to describe the adsorption process of MG on both PBN and PBH with a correlation coefficient R2 > 0.999. Among the tested isotherm models, the Langmuir isotherm was found to be the most relevant to describe MG sorption onto modified P. brutia cones with a correlation factor R2 > 0.999. The ionic strength (presence of other ions: Cl?, Na+, and SO42?) also influences the adsorption due to the change in the surface properties; it had a negative impact on the adsorption of MG on these two supports. A reduction of 68.5% of the adsorption capacity for an equilibrium dye concentration Ce of 30 mg/L was found for the PBH; while with PBN no significant influence of the ionic strength on adsorption was observed, especially in the presence of NaCl for dye concentrations superior to 120 mg L?1. |
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| Keywords: | Adsorption dyes forest waste isotherms kinetics Pinus brutia cones |
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