【摘要】 采用水热-浸渍两步法合成了一系列 N-P/TiO₂纳米管光催化剂,采用 X 射线衍射（XRD）、透射电子显微镜（TEM）、X 射线光电子能谱（XPS）和紫外-可见漫反射吸收光谱（UV-vis）等测试手段对其结构进行了表征.结果表明,300℃焙烧后的 N-P/TiO₂纳米管为锐钛矿相,氮和磷高度分散进入 TiO₂中.P 和 N 掺杂含量分别为0.99%和0.56%.与纯 TiO₂纳米管相比,N-P/TiO₂纳米管在可见光区的有较大的吸收,光吸收阈值产生红移.氮磷共掺杂可以明显提高 TiO₂纳米管的对甲基橙的光催化活性,其原因在于氮阴离子以 N-Ti-O 的结构进入 TiO₂,磷替换 TiO₂部份 Ti⁴⁺,从而降低了电子和空穴复合几率.更多还原

【Abstract】 N-P/TiO₂ nanotubes were prepared by the combination of hydrothermal treat- ment with impregnation method.The prepared materials were characterized with X-ray diffrac- tion（XRD）,transmission electron microscopy（TEM）,X-ray photoelectron spectra（XPS） and UV-vis diffuse reflectance spectra.The experiments demonstrated that the N-P/ TiO₂nanotubes possessed the anatase phase;Nitrogen and phosphorus were highly dispersed on TiOz.The doping concentration of N and P analyzed by XPS were 0.99%and 0.56%,re- spectively.Compared with pure TiO₂ nanotubes,the N-P/TiO₂ nanotubes exhibited an intense absorption in the UV-visible range and a red shift in the band gap transition.The doping with N and P significantly enhanced the photocatalytic activity of TiO₂ nanotubes for methyl orange, which was because the formation of N-Ti-O and replacement of Ti⁴⁺reduced the recombina- tion rate of photogenerating electron and hole.更多还原