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Article Abstract
Tungsten disulfide (WS), a two-dimensional adsorbent material, has garnered great attention in removing lead ions (Pb) from water due to their extensive exposed adsorption sites. However, WS nanosheets inevitably agglomerated and stacked during the preparation and adsorption process, leading to reduced adsorption efficiency. Current method of enhancing WS dispersion is mainly blending with synthetic polymers, but these synthetic polymers themselves do not possess adsorption properties, resulting adsorption effect enhancement poorly. Here, lignin extracted from walnut shells (WS) was intercalated into bulk WS to prepare highly dispersible Lignin/WS composites with synergistic adsorption effects. The spatial resistance and electrostatic repulsion of the intercalated lignin effectively exfoliated bulk WS and stabilized their dispersion. The synergistic adsorption arises from lignin's oxygen-containing groups and WS nanosheets' sulfur-rich surface, which significantly enhanced Pb removal (∼66.9 mg/g). This value surpassed pure lignin and bulk WS by 1.7 and 25.0 times, respectively. Adsorption follows pseudo-second-order kinetic and Freundlich isotherm model, indicating that the adsorption of Pb by the Lignin/WS composite belongs to multi molecular layer chemical adsorption. This work provides a novel strategy for lignin-based adsorbents in water remediation.
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| http://dx.doi.org/10.1016/j.biortech.2025.133284 | DOI Listing |
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