Adsorption performance of cadmium in aqueous solution using biochar-supported iron composites
In this study,biomass carbonization and reduction of trivalent iron simultaneously occurred when leaf powder was co-pyrolyzed with a small amount of Fe3O4 at high temperature,then the biochar-supported iron nanoparticles(FeNPs@BC)containing zero-valent iron were prepared by a one-step method.The results of batch adsorption experiments showed that the optimal performance on cadmium adsorption occurred when the ratio of a leaf biomass to Fe3O4 was 25∶1.The adsorption kinetics followed a pseudo-second-order model,while the adsorption isotherms conformed to the Langmuir model,suggesting that the adsorption of Cd2+onto FeNPs@BC primarily dominated by a chemical one.The maximum equilibrium adsorption capacity at room temperature could reach 145.208 mg·g-1.FeNPs@BC displayed a superior adsorption capacity to Cd2+in water.The preparation process is simple,it can provide a theoretical basis and an alternative adsorbent material for Cd2+removal from wastewater by using biochar-based materials.
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