Adsorption of methylene blue dye from industrial wastewater using activated carbon prepared from agriculture wastes

The aim of the present work is to investigate the ability of activated carbon prepared from agriculture wastes (date palm fibers) (ACDPF) for the adsorption of methylene blue (MB) dye from industrial wastewater. To study the effect of factors affecting the removal efficiency of MB, experiments were conducted under a constant temperature. The batch adsorption process was examined at different parameters of initial MB dye concentration (100-1,000 mg/L), ACDPF dose (0.1-1 g/100 mL), pH (2-10), and mixing time (10-150 min). The optimum operating conditions of initial MB dye, ACDPF dose, pH, and mixing time were 100 mg/L, 0.7 g per 100 mL dye solution, 7, and 120 min, respectively. At the optimum conditions, the maximum removal efficiency was 98% and the adsorption capacity was 120 mg/g. The equilibrium data were analyzed using the Langmuir and Freundlich isotherm models. The data fitted very well into both isotherm models. The adsorption process for the removal of MB dye was proven favorable for monolayer on the surface of ACDPF.