In this study, SiMg doped industrial lignin-based carbon materials (SLCs) were prepared by water bath silicification and MgCl activation to remove Cd from aqueous solutions. What's more, the doping of SiMg jointly promoted the excellent physicochemical properties of the material, e.g., high specific surface area, good pore volume, and numerous oxygen-containing groups. The Cd batch adsorption experiments proved that SLCs have good Cd removal capacity within pH 3-7, and the adsorption model demonstrated the adsorption process as a physicochemically complex process. The maximum adsorption of Cd in the SLC was 665.35 mg/g, and the contributing factors to the removal of Cd were as follows: ion exchange (59.36 %) > Cd precipitation (24.93 %) > oxygen-containing functional group complexation (14.79 %) > Cd-π interactions (0.92 %). In addition, the complexation of SiO, MgO, and Cd precipitates allowed the formation of a three-dimensional fiber mesh structure. The application of SLCs has the potential to eliminate Cd pollution in water bodies, and its preparation is simple and environmentally friendly. Finally, this study provides a theoretical basis for an in-depth understanding of the mechanism of heavy metal adsorption by inorganic nonmetals in combination with metal oxides.
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| http://dx.doi.org/10.1016/j.ijbiomac.2022.12.274 | DOI Listing |
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