g-C3N4 was prepared by calcination using melamine as precursor.After the hydrothermal reac-tion of g-C3N4 with ethylenediamine,amino modified g-C3N4/NH2 photocatalyst was obtained.The removal capacity of U(Ⅵ)from wastewater by g-C3N4/NH2 modified photocatalyst has been studied,and the mor-phology,structure and photocatalytic removal capacity of the modified sample have been characterized by XRD,SEM,XPS,FT-IR.The results show that under the simulated light source,the sample with 30 mL eth-ylenediamine has the best performance,and it can effectively remove more than 99％U(Ⅵ)(10 mg·L-1)within 15 min,about 76.5％U(Ⅵ)(50 mg·L-1)within 150 min.The surface modified material shows excellent adsorption and catalytic properties for U(Ⅵ)solution due to the following reasons:the hydrothermal process can peel g-C3 N4 nanosheets,which increases the specific surface area of the material;the successful introduction of the amino group improves the capturing ability of U(Ⅵ)over g-C3N4,the utilization of photogenerated electrons,and the catalytic performance of g-C3N4/NH2 materials.
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