Harnessing Agricultural Byproducts: Rice Husk-Derived Adsorbents for Heavy Metal Remediation in Water

Abstract

This study investigates the removal of heavy metals Pb(II), Cr(VI) and Ni(II) from water using rice husk-derived materials. The adsorption effectiveness of rice husk charcoal and its refined forms, including carbon-silica, silica, and carbon, was assessed after activation with HCl. The results revealed that activation improves the adsorption of Pb(II) and Cr(VI), particularly at lower concentrations, due to increased surface area and active sites. However, the influence of activation on Ni(II) is less significant. This research highlights the potential of using eco-friendly, cost-effective rice husk-derived adsorbents for water purification, offering a sustainable solution to heavy metal contamination and agricultural waste management.