This study focused on the transformation of agricultural waste into efficient adsorbents for treating wastewater contaminated with textile dyes. The synthesized materials were examined using diverse analytical approaches to determine their physicochemical properties. FTIR spectroscopy revealed modifications in surface functional groups, while X-ray diffraction (XRD) indicated significant changes in mineral composition. The KOH-activated sample (BK) exhibited a well-developed porous microstructure, The morphology observed by SEM was consistent with a high BET-specific surface area of 108.022 m2/g. The optimization of operational parameters was conducted using a statistical approach based on a central composite design (CCD). Fitting the experimental data to the pseudo-premier-order model revealed that the adsorption likely involved a physisorption mechanism. Moreover, the equilibrium data fitted well with the Sips isotherm model. These findings demonstrate the strong potential of the developed materials for methylene blue adsorption and support their application in water treatment processes.