Adsorptive Removal of Methylene Blue from Aqueous Solution Using Sawdust
Saeed Ullah Jan, Younas Ahmad, Murad Ali, Zakir Hussain and Saad Melhi
Published: January 03, 2022
In the present study, modified sawdust was used for the removal of an azo dye Methylene Blue (MB) from aqueous solutions. The study was carried out in batch mode. Effects of various important parameters such as pH, concentration, temperature, dose, and agitation speed on the removal of the dye were investigated for optimization of the process. It was observed that the maximum removal of 99.5% was achieved at the lowest dye concentration of 75PPM. The process of removal was found to be endothermic. Adsorption of Methylene Blue on modified sawdust was rapid and in accordance with pseudo-2nd -order kinetics. The Langmuir isotherm model agrees well with the sorption isotherm data and also confirms that adsorption took place on the homogenous surface of modified sawdust. The adsorption capacity (Qmax.) determined from Langmuir isotherm was found to be 5.464 mg g-1. The thermodynamics parameters like ΔG, ΔH, ΔS are found to be 30.057 kJmol-1, 44.089 kJ mol-1, and 0.0514 kJmol-1K-1 respectively, revealing that the adsorption process is spontaneous, endothermic, and feasible Therefore, the study recommends that modified sawdust is a promising candidate for the efficient removal of dye-contaminated wastewater.
Keywords: Adsorption; Sawdust; Methylene Blue; Kinetics; Thermodynamics