【摘 要】
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Composite materials have elicited much inter-est because of their superior performance in the removal of toxic and radioactive uranyl ions from aqueous solutions.With polyethyleneimine as a functional group,carboxy-lated chitosan as a matrix,and oxidizing
【机 构】
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School of Materials Science and Engineering,Southwest University of Science and Technology,Mianyang
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Composite materials have elicited much inter-est because of their superior performance in the removal of toxic and radioactive uranyl ions from aqueous solutions.With polyethyleneimine as a functional group,carboxy-lated chitosan as a matrix,and oxidizing activated carbon as a nanofiller,this study synthesized a novel environment-friendly polyethylenimine-functionalized carboxylated chitosan/oxidized activated charcoal (PCO) biocomposite with a unique three-dimensional porous structure.PCO was synthesized through an easy chemical cross-linking method.Detailed characterization certified the formation of the unique three-dimensional porous structure.The obtained PCO was used to remove uranyl ions from an aqueous solution,demonstrating the maximum adsorption capacity of 450 mg· g-1.The adsorption capacity of PCO decreased by less than 7.51％ after five adsorption-desorption cycles.PCO exhibited good adsorption selec-tivity (Kd =3.45 × 104 mL·g-1) for uranyl ions.The adsorption mechanism of PCO was also discussed.The material showed good potential for application in the treatment of wastewater containing uranyl ions.
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