This study investigates the isolation and application of a Klason-lignin-based biosorbent derived from sugar palm fruit shell (SPFS) waste for the adsorption of Pb(II) and Cd(II) from toxic wastewater. The SPFS waste. rich in lignocellulose. underwent pretreatment to extract lignin-containing functional groups suitable for metal ion adsorption. https://foldlyers.shop/product-category/internal-drive/