作　　者： ; ; ; ; ;

机构地区： 海南大学材料与化工学院海南优势资源化工材料应用技术教育部重点实验室

出　　处： 《稀有金属》 2011年第4期504-509,共6页

摘　　要： 采用阳极氧化法在纯钛表面制备了二氧化钛纳米管阵列薄膜,在热处理的过程中利用浓氨水的挥发提供氨气氛进行掺N。采用场发射扫描电镜（FESEM）、X射线衍射物相分析（XRD）、X射线光电子能谱（XPS）、紫外可见漫反射光谱（UV-vis）对样品进行了表征。结果表明,制得的二氧化钛纳米管管径为70~80 nm,壁厚为5~10 nm,管长为400~500 nm;N元素成功进入晶格,含量为0.68%;400℃热处理的未掺杂、N掺杂二氧化钛分别为纯锐钛矿相、锐钛矿和金红石混相。相比未掺杂的二氧化钛纳米管,N掺杂的二氧化钛纳米管在可见光区表现出更强的吸收。以甲基橙为模拟污染物,采用分光光度计研究了N掺杂、甲基橙初始浓度、pH值对光催化性能的影响。结果显示,甲基橙的光降解过程符合一级动力学过程,经过150 min的光催化实验,N的掺杂使二氧化钛纳米管的光催化性能提高了11.1%,甲基橙的最佳初始浓度为20 mg·L-1,最佳pH值为1。 TiO2 nanotube arrays were prepared on the surface of pure titanium sheet by anodic oxidation method.N was doped using NH3,which engendered by the volatilization of NH3·H2O during annealing.The characteristics of TiO2 nanotube were investigated by FESEM,XRD,XPS,UV-vis.The results indicated that the diameter of undoped,N-doped TiO2 nanotube was 70~80 nm,the thickness of the wall was 5~10 nm,the length of the tube was 400~500 nm.N was successfully doped into crystal lattice and the content of N was 0.68%（atom fraction）.Undoped TiO2,N-doped TiO2 annealed at 400 ℃ was entirely anatase or anatase mixed with rutile.N-doped TiO2 exhibited stronger absorption under the visible light compared with undoped TiO2.Methyl orange was used as the degraded agent in photocatalytic experiment,the effect of N-doping,initial concentration of Methyl orange and pH on photocatalytic property were studied by spectrophotometer.The results showed that the degradation of methyl orange coincided with first order kinetics,the photocatalytic property of N-doped TiO2 nanotube arrays film was 11.1 % higher than undoped TiO2 nanotube arrays film after exposed for 150 min.The optimum concentration of methyl orange was 20 mg·L-1.The optimum pH value was 1.

关 键 词： 阳极氧化 二氧化钛纳米管 氮掺杂 光催化性能

领　　域： [理学] [理学]