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

Abstract

Methyl orange (MO) is one of the dyes of the azo family used in the textile industry, printing, paper production... Recently, scientists have discovered its pollution and harm to the ecological environment and humans, especially this compound has the potential to cause cancer for users. This paper focus on the adsorption of (MO) in aqueous solution on carbon prepared from soybean residue (TBD). The experiments were conducted using the following parameters:  TBD mass is 0.05g/25 mL, shaking speed is 200 rounds/minute, equilibrium time is 120 minutes at room temperature (25 ± 1⁰C); pH is best 3. Mass TBD needed for MO adsorption is best at 0.05 g/25mL of MO solution. In the temperature range of 298 - 323K, the values of ΔG^o< 0; ΔH^o = -122.99 kJ/mol implicates that the process is self-inflicted and exothermic. According to the Langmuir adsorption isotherm model, the maximum adsorption capacity of TBD for MO was determined to be 153.85 mg/g at 298K. The results of this study will be useful for the future expansion of low-cost activated carbon raw materials for dye removal in industrial wastewater.