作　　者： ; ; ;

机构地区： 佛山大学环境与土木建筑学院资源环境系

出　　处： 《功能材料》 2012年第13期1669-1672,共4页

摘　　要： 以尿素为氮源,采用简单的酸催化溶胶-凝胶法制备了氮掺杂TiO2纳米光催化剂,以甲基橙在可见光照射下的光催化降解为探针反应,评价了其光催化活性。运用XRD、XPS和UV-Vis DRS光谱表征技术考察了氮掺杂TiO2样品的微晶尺寸、晶相结构、表面组成及其吸光特性。结果表明氮掺杂减小了TiO2的带能隙,氮掺杂TiO2纳米微晶对400～530nm的可见光有较强的吸收,在降解甲基橙的实验中表现出良好的可见光催化活性。其中,400℃焙烧制得的具有单一锐钛矿相型,晶粒尺寸为14.94nm的TiO1.9904N0.0096样品的可见光催化活性最佳。 Nitrogen-doped TiO2 nano-sized photocatalysts were prepared by a simple acid-catalyzed sol-gel method using urea as nitrogen raw material. The photocatalytic decomposition of methyl orange in aqueous solution was used as a probe reaction to evaluate their photocatalytic activities under visible light irradiation. The prepared ni- trogen-doped TiO2 samples on the crystallite sizes, cystal pattern, suface composition and optical absorption property were characterized by means of the techniques such as XRD,XPS and UV-Vis DRS spectra. The re- sults showed that doping nitrogen in TiO2 reduces its band gap energy,which makes nitrogen-doped TiO2 nano- crystallites have a stronger visible light absorption from 400 to 530nm. Also they have high visible light photo- catalytic activities in the degradation of methyl orange. The crystallite size of single anatase TiO1.9904 N0.0096 calcined at 400℃ was 14.94nm and exhibited the highest visible light photocatalytic activity.

关 键 词： 纳米 光催化 氮掺杂 可见光 甲基橙

领　　域： [理学] [理学]