摘要
在3种晶型(锐钛矿型、板钛矿型和金红石型)的TiO2中,只有锐钛矿型的TiO2具有较好的光催化活性。因为钛矿型TiO2不稳定,它容易转化为最稳定的金红石型,所以简易地制备锐钛矿型TiO2比较困难。在最佳条件下:以0.15 mol/L的Ti(SO4)2溶液为原料,外加添加剂(关键技术,添加剂/Ti4+摩尔比为4/1)于170℃下水热反应4 h,在玻璃基板上制备TiO2纳米晶体薄膜,SEM、TEM和XRD表征结果说明,生成的TiO2晶体为锐钛矿型。制备的TiO2薄膜平整、密实,厚约2μm,薄膜由大面积的TiO2纳米晶体自组装而成,TiO2纳米晶体呈现八面体结构,平整的三角形表面边长约100～200 nm,晶体长约1μm。
TiO2 exists in three principal crystallographic forms（anatase,brookite and rutile）,but only the anatase form is photocatalytically active and easily transforms into a rutile-type one,so the technique to easily prepare anatase TiO2 is difficult.In this present work,anatase TiO2 nanocrystalline films were easily prepared by adding additive via hydrothermal treatment under optimum conditions（0.15 mol/L Ti（SO4）2 sulfate aqueous solution,the additive/Ti4 ＋ molar ratio 4/1,the heat temperature 170 ℃ and reaction time 4 h）.The results characterized by SEM,TEM and XRD show that the as-prepared TiO2 crystals is anatase.The film is about 2 μm in thickness which is a large scale self-assembly of TiO2 nanocrystals,individual TiO2 nanocrystals are shown in octahedron and have flat triangle planes 100-200 nm in side length and 1 μm in length.
出处
《兵器材料科学与工程》
CAS
CSCD
2010年第3期12-14,共3页
Ordnance Material Science and Engineering
基金
国家"973"计划项目(批准号2003CB716902)
江西省教育厅科技资助项目(赣教高字[2008]87号GJJ09373)
关键词
锐钛矿型TiO2
添加剂
薄膜
水热法
制备
表征
anatase TiO2
additive
films
hydrothermal treatment
preparation
characterization
