作　　者： ; ; ; ; ;

机构地区： 深圳职业技术学院建筑与环境工程学院

出　　处： 《北京科技大学学报》 2008年第11期1286-1289,1295,共5页

摘　　要： 以饱和尿素溶液水解沉淀工艺制备水合TiO2,再于温度600℃的空气气氛下煅烧2h,制得淡黄色的N/TiO2光催化剂,并以活性艳红X-3B、2,4-二氯苯酚及CH3COO-作模型污染物,着重研究了N/TiO2的可见光催化反应特性.XPS结果表明,掺杂N是以形成Ti-N化学键的形式进入了TiO2的晶格.UV-Vis结果表明,N/TiO2光催化剂对波长不低于400nm的可见光有明显的吸收效应.光催化结果表明:N/TiO2在主峰420nm的荧光灯作用下,对活性艳红X-3B及2,4-二氯苯酚有明显的降解作用,但对CH3COO-无降解作用,然而当在主峰254nm或365nm的紫外灯作用下时能降解CH3COO-;激发光源波长在紫外区还是可见光区与光催化的氧化能力是密切相关的. N-doped TiO2 photocatalyst was prepared by calcination of hydrated titanium dioxide in ambient atmosphere at 600℃ for 2 h, which was obtained by using saturated urea solutions as precipitant. The photocatalytic properties of the obtained yellow sampies were studied using reactive brilliant red X-3B, 2, 4-dichlorophenol and CH3COO^- as model pollutants. XPS results indicated that nitrogen was doped into TiO2 lattice in the form of Ti-N chemical bond. UV-Vis results showed that the sample could absorb the visible light wavelength above 400 nm. Photocatalytic results revealed that X-3B and 2, 4-dichlorophenol could be degraded by N/TiO2 photocatalysis when using a fluorescent lamp of 420 nm in main wavelength as the light source, while CH3COO^- could not be degraded, however, CH3COO^- could be degraded by N/TiO2 photocatalysis under UV irradiation. The wavelength of excitation illumination has great influence on the oxidative power of N/TiO2 photocatalysis.

关 键 词： 光催化 掺氮 可见光 氧化能力

领　　域： [理学] [理学]