不同形貌N-TiO_2的水热合成及其光催化性能研究  

Studies on hydrothermal synthesis of nitrogen-doped titanium dioxide with different morphologies and photocatalytic activities

作　　者：周珺[1] 郑玉婴[1] 

机构地区：[1]福州大学材料科学与工程学院,福州350108

出　　处：《功能材料》2015年第7期7148-7152,共5页Journal of Functional Materials

基　　金：福建省高校产学合作科技重大关键资助项目(2012H6008);福州市科技计划资助项目(2013-G-92)

摘　　要：以TiN为钛源和氮源,采用水热法分别以H2SO4、HCl、HNO3为介质合成了N-TiO2纳米粉末,研究了介质及水热反应温度对N-TiO2晶型、形貌、粒径及光催化性能的影响。SEM、XRD表明,H2SO4为介质得到粒状锐钛矿N-TiO2,HCl、HNO3为介质得到棒状金红石N-TiO2,粒径d(HCl)>d(HNO3)>d(H2SO4),相同介质中,粒径随反应温度的升高而增大。XPS、HRTEM表明,N元素以O—Ti—N键形式掺杂,使得TiO2晶格间距变大。UV-Vis表明,N掺杂降低了TiO2的禁带宽度,感光范围拓展到可见光区。可见光催化降解实验表明,催化效率η(H2SO4)>η(HNO3)>η(HCl),相同介质中,光催化效率随反应温度的升高而降低。Nitrogen-doped titanium dioxide(N-TiO2)nanopowders were prepared by hydrothermal synthesis in H2SO4,HCl,HNO3 using the titanium nitride(TiN)as both titanium resource and nitrogen resource.Effects of solvent medium and hydrothermal temperature on the crystalline type,morphology,size and the photocatalytic activities of the product was investigated.The SEM,XRD result shows that granular anatase TiO2 was obtained in H2SO4,while rod-like rutile TiO2 could be obtained in HCl and HNO3,the crystalline size was as follows:d(HCl)>d(HNO3)>d(H2SO4),it largens with increasing hydrothermal temperature in the same solvent medium.Nitrogen atoms are doped into TiO2 lattice,form a new bond of O—Ti—N resulting in an increase of the lattice distance,which are confirmed by XPS,HRTEM.The narrow of band-gap and the visiblelight response are due to nitrogen doping,which are shown by UV-Vis spectra analysis.The experiments of photodegradation of methyl orange show that,the photocatalytic activities was as follows:η(H2SO4)>η(HNO3)>η(HCl),it lessens with increasing hydrothermal temperature in the same solvent medium.

关 键 词：水热合成 氮掺杂 金红石 锐钛矿 可见光 

分 类 号：TQ134[化学工程—无机化工]