氮掺杂锐钛矿TiO_2光催化剂的制备和表征  

Preparation and Characterization of Nitrogen-doped Anatase Titania Photocatalyst

作　　者：程萍[1] 邓长生[1] 顾明元[2] 戴遐明[1] 

机构地区：[1]清华大学核能与新能源技术研究院北京精细陶瓷实验室,北京102201 [2]上海交通大学金属基复合材料国家重点实验室,上海200030

出　　处：《武汉理工大学学报》2007年第10期165-168,172,共5页Journal of Wuhan University of Technology

基　　金：中国博士后科学基金(20060400055);清华大学新型陶瓷与精细工艺国家重点实验室开放基金

摘　　要：采用氨气氮化工艺制备了氮掺杂的TiO2光催化剂,研究了氮化温度对光催化性能的影响。研究表明,在TiO2中加入5%的SiO2能够有效阻止TiO2在NH3中热处理时可能发生的锐钛矿相向金红石相的转变,并减缓比表面积降低;氮化后的TiO2样品中N置换TiO2晶格中的O原子形成O—Ti—N键,在TiO2的禁带中形成了氮掺杂能级,从而使TiO2的吸收边发生红移。在700℃的氨气流中氮化处理后的5%SiO2/TiO2样品,N元素含量为0.28%,能够吸收550 nm以下的可见光,比表面积为129 m2/g,全为锐钛矿型TiO2,表现出最佳可见光光催化性能。The nitrogen doped titania photocatalysts were prepared by nitridation process. The influence of nitriding temperature on the photocatalytic property has been researched. The addition of 5 % SiO2 effectively prevented the transformation of titania from anatase to futile as well as the decrease of specific surface area of the photocatalyst. XPS result indicated that N substituted O in TiO2 crystal lattice to form O-Ti-N, which resulted in an redshift of the absorption edge of TiO2. 5%SiO2/TiO2 sample calcined at 700℃ for 3 hours in a flow of NH3 atmosphere can absorb it 〈 550 nm visible light and showed the higher photoactivity compared with samples calcined at 600℃ and 800℃.

关 键 词：TIO2 氮掺杂 可见光 光催化 

分 类 号：O614.41[理学—无机化学]