Adsorption performance and mechanism of g-C3N4/CS composite for U(Ⅵ)from aqueous solution
Aimed at the problem of environmental uranium pollution caused by uranium-containing wastewater generated in the process of nuclear energy development and application,by loading g-C3N4 on chitosan (CS) through the cross-linking method,g-C3N4/CS composite was synthesized and used to remove U(Ⅵ) from aqueous solutions.The surface properties and the interaction mechanism of g-C3N4/CS were analyzed.The results show that when the adsorbent dosage of g-C3N4/CS is 0.2 g/L,mass fraction of g-C3N4 is 20％,adsorption time is 120 min,adsorption temperature is 308 K,and pH is 6,the maximum adsorption capacity of g-C3N4/CS on U(Ⅵ) reaches 324.45 mg/g.The adsorption of U(Ⅵ) by g-C3N4/CS involves a spontaneous endothermic process that follows the Langmuir isotherm model and quasi-second-order kinetic model.The adsorption mechanism of U(Ⅵ) by g-C3N4/CS is primarily attributed to the coordinated complexation of functional groups such as—NH,—OH,C—O,C=O,and C—N.The results of the recycling experiments show that g-C3N4/CS has good reusability.
uranium (Ⅵ)adsorptiong-C3N4chitosanperformance and mechanismcomposite
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