ADSORPTION OF METHYLENE BLUE DYE BY ACTIVATED CARBON PREPARED FROM MALTED SORGHUM MASH AND PLANTAIN PEELS

The feasibility of using an activated carbon prepared from teak leaf litter and cocoa pod husks (MPAC) to remove methylene blue (MB) from aqueous solution was investigated. The effects of contact time, MPAC dosage, initial concentration, pH and temperature of MB solution were investigated through adsorption equilibrium, isotherm, kinetic and thermodynamic studies. Optimum adsorption of MB from solution occurred at pH 8 and low adsorbent dosages. The physical adsorption process was endothermic and best described by Langmuir isotherm, pseudo-second order kinetic models and liquid film diffusion mechanism. MPAC is a promising adsorbent for removing MB from aqueous solution

Removal of malachite green from aqueous solution using activated carbon prepared from teak leaf litter

Teak leaf litter (TLL) was impregnated with phosphoric acid and activated at 400 °C for 1 h to produce teak leaf litter activated carbon (TLLAC). Equilibrium adsorption, kinetics and thermodynamics study was then used to assess the removal of malachite green (MG) from aqueous solution by the novel adsorbent. Temperature, pH and initial concentration of dye solution as well as dosage and contact time influenced the adsorption process. The optimum TLLAC dosage for adsorption of MG was 0.5 g/L. Removal of MG from aqueous solutions increased up to pH 10. The adsorption process was best described using Langmuir isotherm with 91.74 mg/g as the monolayer capacity of TLLAC. Pseudo-second order kinetic model best fit the adsorbent-dye interactions. The mechanism of uptake of MG by TLLAC was jointly influenced by both liquid film and intraparticle diffusion but neither was the rate controlling step. The exothermic process was spontaneous below 313 K. The value of ΔH° (-83.82 kJ/mol) implies possibility of influence of chemical adsorption in the system. The study revealed that TLLAC exhibited potentials to remove MG from aqueous solutions