Study of methylene blue removal by a biosorbent prepared with apple peels

This work investigates the removal of the methylene blue by adsorption using dried apple peels. for this purpose,various experimental parameters were studied: ph [3-10],adsorbent dose [0.25- 3 g/l],solution temperature [10-40°c] and initial concentration of methylene blue [10- 345 mg/l]. adsorption data were modeled using langmuir,freundlich and temkin adsorption isotherms. the results indicated that the equilibrium data was well represented by langmuir isotherm with r2 = 0.99. the maximum adsorption capacity is 107.52 mg/g.the kinetics of methylene blue adsorption using apple peels is described by the pseudo-second order model. in addition,the thermodynamic parameters such as δh°,δs° and δg° were determined,and the dye adsorption process is exothermic. © 2017,university of mohammed premier oujda morocco.