N-CDs@Nb_(2)O_(5)-AMMC纳米材料的制备及其可见光催化性能研究

Preparation of N-CDs@Nb_(2)O_(5)-AMMC nanomaterial and study ofvisible light photocatalytic property

通过工艺简单的水热法成功制备出N-CDs和不同含量N-CDs修饰的N-CDs-X@Nb_(2)O_(5)-AMMC纳米材料。对N-CDs-X@Nb_(2)O_(5)-AMMC进行XRD、SEM、TEM、FT-IR、XPS和UV-vis DRS等表征分析。结果表明,经过N-CDs改性之后Nb_(2)O_(5)-AMMC的带隙变窄,样品的吸收边红移和光吸收范围变宽,从而有利于提高光催化性能。另外,N-CDs减少了电子传输的阻力,有利于光生电子向N-CDs结构的转移,同时光生载流子的迁移及分离效率提高,有利于光催化反应的进行。与纯Nb_(2)O_(5)-AMMC相比,N-CDs-X@Nb_(2)O_(5)-AMMC在可见光下光催化降解TC-HCl的性能均有提高,其中样品N-CDs-1@Nb_(2)O_(5)-AMMC的降解效率最高,1 h内对TC-HCl的降解率能达到63.2%,是纯Nb_(2)O_(5)-AMMC的1.59倍。

In this paper,N-CDs and N-CDs-X@Nb_(2)O_(5)-AMMC nanomaterials modified with different contents of N-CDs have been successfully prepared by a simple hydrothermal method.N-CDs-X@Nb_(2)O_(5)-AMMC was characterized by XRD,SEM,TEM,FT-IR,XPS,UV-vis DRS and so on,and the results indicate that the band gap of Nb_(2)O_(5)-AMMC is narrowed after N-CDs modification,and the absorption band edge of the sample shows redshift and wider light absorption range,which is conducive to improving the photocatalytic performance.In addition,N-CDs reduces the resistance of electron transport,which is conducive to the transfer of photogenerated electrons to the N-CDs structure.At the same time,the migration and separation efficiency of photogenerated carriers are improved,which is conducive to the photocatalytic reaction.Compared with pure Nb_(2)O_(5)-AMMC,N-CDs-X@Nb_(2)O_(5)-AMMC has improved photocatalytic degradation performance of TC-HCl under visible light,in which N-CDs-1@Nb_(2)O_(5)-AMMC has the highest degradation efficiency.The degradation rate of N-CDs-1@Nb_(2)O_(5)-AMMC for TC-HCl reaches 63.2%within 1h,which is 1.59 times of pure Nb_(2)O_(5)-AMMC.