Activated sawdust as a sustainable solution for mercury removal in contaminated waters

Abstract

This study investigates the synthesis of a cost-effective sawdust-derived adsorbent through an acidic and alkaline treatments, providing an alternative material for water purification specially for mercury removal. The Scanning Electron Microscopy revealed a porous structure, the Fourier transform infrared spectroscopy confirmed the existence of wide range of functional groups, and the Thermogravimetric analysis affirmed its thermal stability. Notably, the adsorbent exhibited an exceptional mercury uptake capacity of 528 mg/g according to Langmuir isotherm model, surpassing conventional low-cost alternatives. The kinetics adsorption data were modeled by nine kinetic models, likewise the adsorption isotherms data were modeled by eight isotherm models. The thermodynamic parameters, indicates that the removal process of mercury by activated sawdust is spontaneous and exothermic nature, occurs in less randomness at this interface. This research underscores the adsorbent’s promise for mercury removal, making a significant contribution to sustainable environmental remediation practices. The economic viability, coupled with its impressive performance metrics, positions this sawdust-derived adsorbent as a promising candidate for addressing water contamination challenges.