A.A Nazari Moghaddam - School of Chemical Engineering, College of Engineering, Islamic Azad University of Shahrood, Shahrood, Iran
G.D Najafpour - School of Chemical Engineering, College of Engineering, Babol Noshirvani University of Technology, Babol, Iran
M Mohammadi - School of Chemical Engineering, College of Engineering, Babol Noshirvani University of Technology, Babol, Iran
A.R Ramezani - School of Chemical Engineering, College of Engineering, Islamic Azad University of Shahrood, Shahrood, Iran

Methylene Blue (MB) adsorption from aqueous solution was investigated using three different absorbents. Granular solid adsorbents were prepared from waste wood fly ash and clay. Experiments were conducted in a packed column to remove MB from the synthetic wastewater. The fabricated adsorbents and also raw walnut shell were implemented to compare the performance of the packed adsorbents. The generated wastewater contained 4 mg/l of MB. The wastewater with flow rate of 18 ml/min was continuously pumped through the column using peristaltic pump for the removal of dyes from aqueous phase. The effluent samples were collected with respect to time at a time interval of 2 min. It was observed that the maximum and minimum removal efficiency of 90 and 53% was devoted to walnut shell and clay, respectively. Langmuir and Freundlich isotherm models of adsorption were investigated to interpret the experimental data. The obtained results revealed that the sorption data were well described by the Freundlich model. Adsorption model represented by Langmuir model also depicts similar results. The maximum adsorption capacity of clay, fly ash and walnut shell was 7.143, 7.874 and 5.780 mg/g, respectively.

Methylene Blue, Adsorption Model, Clay, Fly Ash, Walnut Shell