EFFECT OF pH ON THE REMOVAL OF METHYLENE BLUE FROM SYNTHETIC AQUEOUS SOLUTION BY A NATURAL WASTE MATERIAL: ALMOND PEEL EFFET DU pH SUR L’ELIMINATION DU BLEU DE METHYLENE EN SOLUTION AQUEUSE SYNTHETIQUE PAR UN MATERIAU DECHET D’ORIGINE NATURELLE: LA PEAU D
HOUCINE BENAISSA* LABORATOIRE DE MATÉRIAUX SORBANTS ET TRAITEMENT DES EAUX, DÉPARTEMENT DE CHIMIE, FACULTÉ DES SCIENCES, UNIVERSITÉ DE TLEMCEN, B.P. 119, 13000 TLEMCEN, ALGÉRIE *CORRESPONDING AUTHOR: HO_BENAISSA@YAHOO.FR; TÉL./FAX. 00 (213) 43 28 63 08
In this research, the effect of initial pH of solution on the removal of methylene blue from synthetic aqueous solution by a waste material namely almond peel was studied. The present study reports its sorption potential through kinetics tests and sorption isotherms at 25 °C, in batch conditions. As results obtained here, the initial pH of dye solution has an influence on the kinetics and equilibrium of methylene blue sorption by almond peel. As the initial pH of solution increased, the amount of methylene blue sorbed at equilibrium increased. The optimum initial pH for the removal of dye was about 6. The necessary time to reach equilibrium was initial pH dependent and was in the range of 6 – 8 hours. The results showed that the process followed a pseudo second-order kinetics. Langmuir model gave an acceptable fit to the experimental data over the whole equilibrium dye concentrations range. A high maximum dye sorption capacity was observed by this sorbent material: about 128.53 mg/g at pH0 = 6.
