Methylene Blue Dye Removal from Wastewater Using Ailanthus Excelsa Roxb as Adsorbent

The removal of methylene blue dye from wastewater using Ailanthus excelsa Roxb was investigated via batch mode in this study. The following parameters were used: pH 2-12, contact time 0-240 min, adsorbent dose 0.1-1 g and dye concentration 12.5, 25, 50, 75 and 100 ppm. Various isotherms including Langmuir, Freundlich, Temkin and Dubinin-Radushkevich (D-R) models and kinetics study including first-order, second-order, Lagergren equation and pseudo-second-order were carried out. The removal efficiency was found to be 68% at pH of 10, contact time of 180 min, initial concentration 100 ppm and 0.5 g/100 mL adsorbent dose at 300 K. Based on the coefficient of correlation, pseudo-second-order kinetics and the Freundlich isotherm model were found to best represent the dye removal. The experimental adsorption capacity was found to be 18.867 mg g(-1). Thermodynamics study showed that the experiment performed was endothermic and spontaneous.