多缺陷碳纳米管的制备及其光催化性能研究

低温合成的碳纳米管在纯化后进行高温煅烧(真空),X射线光电子能谱(XPS)和比表面积(BET)分析显示,O/C原子比下降,比表面积增大.拉曼光谱和透射电子显微镜(TEM)进一步证实,该热处理的碳管呈现较多的缺陷.光催化测试显示此种多缺陷碳管具有明显的光催化性能.这主要是因为,大部分化学吸附的氧原子将被解吸,很容易使局部晶格重新排布,形成大量的拓扑学缺陷和空位缺陷.由此在碳管的能隙间形成缺陷态能级,以致可以被可见光激发,即表现出光催化特性.

Preparation and Photocatalytic Property of the Defect abundant Carbon Nanotubes

The low temperature prepared carbon nanotubes are annealed in the high vacuum after purification.X-ray photoelectron spectroscopy(XPS) and multipoint specific surface area(BET) show that the O/C ratio has decreased and the BET has increased.Raman spectroscopy and high transmission electron microscopy(HRTEM) are further confirmed the abundant defects of the DF-CNTs.The photocatalytic experiments are also investigated through the degradation of H2O2,the result shows that the defect-abundant CNTs have the photocatalytic property.It is believed that the most of chemisorbed oxygen atoms are desorbed from the surface of CNTs,which could cause the local lattice reordering and produce more topological and abundant vacant defects,which could further initiate defect states in the band gap.Therefore,the absorption of visible light leads to the formation of the photocatalytic oxidation.