Removal of Reactive Dye by Using Soybean Cake.

In this study, soybean cake as an economic adsorbent was used to remove reactive dye from aqueous solution. Effect of initial pH, dose, contact time and particle size were studied. The selected conditions are 2, 100 mesh, 1 g/l and 30 min for initial pH, particle size, adsorbent dosage and contact time, respectively. The equilibrium data and kinetic data were analyzed for adsorption mechanism and characteristic. According to the results, second order kinetic model and Langmuir isotherm model are well fitted to the experimental data obtained for Reactive Black 5 (RB5) adsorption on soybean cake. The monolayer adsorption capacity values were calculated as 250 and 285.7 mgRB5/g for 20 and 60°C, respectively. [ABSTRACT FROM AUTHOR]