摘要
采用阳离子聚苯乙烯(PS)微球为模板,以钛酸丁酯为前驱体经溶胶凝胶反应制备了TiO2/PS复合微球,并经高温煅烧得到单分散中空TiO2纳米微球。采用扫描电镜(SEM)、透射电镜(TEM)、红外光谱仪(FT-IR)、X射线衍射仪(XRD)和紫外-可见分光光度计(UV-VIS DRS)对复合和中空微球的结构和光催化性能进行了表征。结果表明,经高温煅烧后TiO2中空微球尺寸相对于复合微球收缩了约25%,其粒径约为100 nm;中空微球壳层厚度可随钛酸丁酯用量而变化,壳层呈锐钛矿和金红石混晶结构,同时中空微球表现出比P25纳米TiO2更强的甲基橙光降解特性。
The mono-dispersed hollow TiO2 nanospheres were fabricated by calcining the polystyrene-titania composite microspheres prepared via a sol-gel process of titanium tetrabutoxide （TBOT） using cationic polystyrene （PS） spheres as template. The microstructure, the photocatalytic activity of the composite microspheres and the hollow nanospheres were characterized by scanning electron microscopy （SEM）, transmission electron microscopy （TEM）, Fourier-transform infrared spectroscopy （FT-IR）, X-ray diffraction （XRD）, and UV-VIS DRS. The results indicate that the diameter of hollow titania spheres is ca.100 nm and the sizes of titania hollow spheres are about 25% smaller than those of the titania-coated PS spheres as a result of calcination-induced shrinkage. The thickness of TiO2 shell is finely tuned by varying the amount of titania precursor, The TiO2 shell is composed of many phase separated anatase/rutile mixed nanocrystallite. The prepared samples show much better photocatalytic activity in the degradation of methyl orange aqueous solution than commercial P25.
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2014年第6期1324-1328,共5页
Rare Metal Materials and Engineering
基金
Hubei Province Natural Science Foundation(2009CDA030,2010CDB05807)
