Removal of Methylene Blue from Aqueous Phase by Pretreated Walnut Shell in a Packed Column

Methylene blue (mb) adsorption from aqueous phase was investigated . pretreated walnut shell , asadsorbent was used. experiments were conducted in a batch system for determination of sorption equilibriaand then the data were incorporated in a packed column for the removal of mb from synthetic wastewater.the generated wastewater was contained 4 mg/i of mb. the wastewater was pumped through the columnwith flow rate of 18 ml/min and the effluent samples were collected. the effect of influent mb con centration(4 and 8 mg/i) and ph (5, 7 and 9) of wastewater on removal efficiency of dye were investigated. langmuirads orption isotherm model was implemented to interpret the experimental data. the obtained results reveal edthat the sorption data were well described by langmuir model at ph value of 9. at contact time of 300 min,maximum equilibrium adsorption ofmb uptake 6.7 mg/g adsorbent was achieved.