摘要
以钛酸四丁酯为钛源,与尿素混合制成含氮前驱体,于一定温度的空气气氛下煅烧2小时,制得掺氮TiO2光催化剂。用TEM和XRD等手段对制备的掺氮氧化钛进行了表征,并对其可见光照射下的光催化性能进行了测试。结果表明,400℃￣600℃煅烧温度下的样品为锐钛矿型,700℃煅烧温度下锐钛矿相开始向金红石相转变。掺杂氮是以化学键形式掺入TiO2晶格的,含量约为3%,并随煅烧温度的升高而略有降低,600℃煅烧温度下的样品可见光催化活性最强,在波长不低于400nm的可见光作用下,对亚甲基蓝的4小时降解率超过80%。
N-doped TiO2 photocatalysts were prepared by mixing tetrabutyl titanate with urea in ethanol, then calcined in air atmosphere at different temperatures. The photocatalysts were characterized by TEM and XRD and their photocatalytic activities under visible-light irradiation were also investigated. The results indicated that, the samples had anatase crystal structure when calcining temperature is between 400℃ and 600℃, and it began to transform to rutile at 700℃. About 3% nitrogen atom was doped into TiO2 lattice in the form of chemical bond, and the doped content of N decreased slightly with the calcined temperature increasing. The calcined sample at 600℃ has the best photocatalytic activities in the degradation of methylence blue under visible-light wavelength above 400 nm, and photocatalytic results showed that over 80% methylence blue could be degraded after 4 hours reaction.
出处
《陶瓷学报》
CAS
2007年第3期191-194,共4页
Journal of Ceramics
关键词
氮掺杂
氧化钛
光催化
可见光
N-doped, TiO2, photocatalysis, visible-light
