STUDY ON THE ADSORPTION CAPACITY OF METHYLENE BLUE ON ACTIVATED CARBON PREPARED FROM SOYBEAN RESIDUE

Abstract

This paper focus on the adsorption of methylene blue (MB) in aqueous solution on carbon prepared from soybean residue (TBĐ). The experiments were conducted using the following parameters:  TBĐ mass is 0.05g/25 mL, shaking speed is 200 rounds/minute, equilibrium time is 90 minutes at room temperature (25±1⁰C); pH is best 8. Mass TBĐ needed for MB adsorption is best at 0.05 g/25mL of MB solution.  In the temperature range of 298 - 323K, the values of ΔG^o < 0; ΔH^o = -18.3 kJ/mol implicates that the process is self-inflicted and exothermic. The result indicates that, maximum adsorption capacity was calculat by the Langmuir adsorption isotherm model as 166.67 mg/g at 298K.