Bio agricultural waste for the efficient removal of cationic dye from aqueous system

Abstract

This thesis explores the effectiveness of adsorption as a simple and efficient method for treating water contaminated with methylene blue MB. Due to the high cost of conventional treatment methods, peanut shells PS were adopted as a low-cost, environmentally friendly natural adsorbent. Laboratory experiments were conducted to evaluate the adsorption efficiency at optimized conditions, the results showed that PS have a high efficiency for MB dye removal 98% at 0,6 g, pH 7, and 25°C. Kinetic study confirmed pseudo-second-order kinetics. The Langmuir isotherm model best described adsorption, with a monolayer capacity of 29,5 mg/g. Thermodynamic studies indicated the process was spontaneous, exothermic, and decrease in randomness at the solid-liquid interface during adsorption.