Abstract
BackgroundThe removal of heavy metals is very important because of their nonbiodegradability and toxicity to the general population and environment. Adsorption is regarded as a promising approach for target pollutant removal due to its simplicity and economy. MethodsNovel magnetic covalent organic framework (COF) composites (Fe3O4@TpPa-NO2) consisting of a magnetic Fe3O4 core and a TpPa-NO2 COF shell are synthesized and developed as adsorbents for Pb(II) removal from aqueous solution. Significant findingsThe obtained composites exhibit superior adsorption performance (909.1 mg/g) and fast adsorption dynamics (adsorption equilibration time of less than 10 min) toward Pb(II). The experimental data for the adsorption of Pb(II) follow pseudo-second-order kinetic and Langmuir isotherm models. The superior performance of Fe3O4@TpPa-NO2 for Pb(II) elimination is attributed to electrostatic and coordination interactions between the metal ion and functional groups (nitrogen and oxygen) of magnetic COF composites. The Pb(II)-loaded Fe3O4@TpPa-NO2 can be easily regenerated by acid treatment. Furthermore, Fe3O4@TpPa-NO2 demonstrates excellent reusability and maintains a high removal efficiency throughout five consecutive adsorption-desorption processes. Various COF-based magnetic adsorbents can be fabricated for specific pollutants due to the diversity in the structure and pore size of the COFs, which present attractive prospects for high-efficiency removal of contaminants in water treatment.
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