Adsorption of Methylene Blue and Methyl Orange Dyes From Aqueuos Solution Using Activated Carbon of Jute and Sickle Senna Leaves

Adsorption is potentially an attractive methodology for removal of hazardous dyestuff from industrial effluents. In this study, the removal efficiency of industrially important dyes methylene blue (MB) and methyl orange (MO) from aqueous solution using jute leaves (JL) and sickle senna leaves (SSL), and activated carbon of jute and sickle senna leaves A C-SSL and AC-JL as Adsorbents had been investigated. The prepared adsorbents were characterized using Fourier Transform Infrared (FTIR) spectroscopy, Scanning electron microscopy (SEM) and Energy Dispersive X-ray, (EDX). The effect of different parameters such as contact time, temperature, initial dye concentration, adsorbent dosage and pH were studied. The results obtained revel that the optimum time at 60 minutes and 50 minutes, acidic pH of 2 and 0.5g and 0.6g respectively, the experimental data were interpreted and studied using. Four isotherm models namely Langmuir, Freundlich, Temkin and Dubenin Redushkebich were tested and adsorption was found to fit well into Langmuir model and Temkin relatively better than others. The maximum loading capacity (qm) of the adsorbent AC-MOJLA is 248 and AC-MBJLB is 245 respectively. Adsorbtion kinetics parameters such as Pseudo first order, Pseudo second order, Intra particles diffusion and Simple elovich were used to described the data, the investigations showed that the kinetic data was well described by Pseudo first order and Pseudo second order kinetic model with the high correlation coefficients (R2). Thermodynamic parameters such as ∆G, ∆H, ∆S, were calculated. The negative values of ∆G, indicate that the process is spontaneous in nature and the positive values of ∆H, shows the endothermic nature of the process. The positive values of ∆S indicated that the randomness of the solid/solution interface increased during the adsorption process. The activation energy also was calculated. The FTIR and SEM analyses of the adsorbent suggest that adsorption of the dyes was through an electrostatic interaction between the functional groups present in the dyes and those on the surface of the adsorbent. Keywords: methylene blue; Activated carbon; methyl orange; isotherm; kinetic and thermodynamics; chemisorption; physisorption; enthalpy change; entropy change; free energy change; activation energy; Adsorption and Desorption.