摘要
以TiCl4为原料,微晶纤维素为模板,制备了具有微晶纤维素特征形貌的纳米二氧化钛。借助透射电子显微镜、环境扫描电子显微镜、傅里叶变换红外光谱、X射线衍射、热重分析等分析方法对样品进行表征,探讨纳米二氧化钛的形成机理。结果表明:在500℃焙烧得到准球形锐钛矿纳米二氧化钛,粒径为15 nm;在700℃和900℃焙烧分别得到夹有金红石型的锐钛矿和红晶石型纳米二氧化钛,并且随着焙烧温度的升高,纳米二氧化钛晶型由锐钛矿逐渐转变成金红石型,其粒径增大,烧结加剧致使形貌变得更不规则。700℃焙烧产物在紫外光下对罗丹明B具有较佳的光催化降解性能。
The nano-TiO2 with characterization of microcrystalline cellulose was prepared with raw material of TiCI, and microcrystalline cellulose (MCC) as template agent. The formation mechanism of nano-TiO2 was separately discussed with the analysis of transmission electron microscope ( TEM ) , environmental scanning electron microscope ( ESEM ) , fourier transform infrared spectroscopy ( FTIR ), X-ray diffraction ( XRD ), thermal gravimetric analysis ( TGA ). The results show that particle size of the prepared quasi-spherical anatase nano-TiO2 is about 15 nm at sintering temprature of 500 ℃. The nano-TiO2 with a lot of rutile anatase and the red spar-type was prepared at 700℃ and 900℃, respectively. With the increase of the sintering temperature, the crystal type of nano-TiO2 changed gradually from anatase into rutile, and the particle size also increased. Meanwhile, the morphology of nano-TiO2 became more irregular with the sintering going ahead. The product of sintering at 700℃ has a better photo-catalytic degradation performance for rhodamine B under UV light.
出处
《现代化工》
CAS
CSCD
北大核心
2012年第5期82-85,共4页
Modern Chemical Industry
基金
国家自然科学基金资助项目(31070633)
人力资源和社会保障部留学回国人员科技活动择优资助项目(07041311401)
东北林业大学研究生论文资助项目(ST1P10)
关键词
微晶纤维素
前驱体
纳米二氧化钛
模板法
光催化降解
microcrystalline cellulose
precursor
nano-TiO2
template method
photo-catalytic degradation