水热法制备高相变温度的二氧化钛纳米结构空心球

HYDROTHERMAL SYNTHESIS OF TITANIUM DIOXIDE NANOSTRUCTURAL HOLLOW SPHERES WITH HIGH PHASE TRANSITION TEMPERATURE

实验采用无模板水热法合成了高相变温度的TiO2纳米结构的空心微球,对其结构和光催化性能进行了表征。X射线衍射分析表明,160℃水热条件下即可得到结晶良好的锐钛矿型TiO2,经过900℃热处理后仍为锐钛矿型,直到1 100℃热处理后完全转变为金红石型。场发射扫描电子显微镜和透射电子显微镜照片表明,所得锐钛矿型TiO2颗粒为空心微球,直径约为1μm,由尺寸20～30 nm的TiO2纳米粒子组装而成。光催化测试表明,该空心球有较高的光催化氧化性能,25 min后二氧化钛空心微球对罗丹明B的降解率可达100%。

TiO2 hollow microspheres have been synthesized by a template free hydrothermal method,and the structure and photocatalytic properties have been characterized. X-ray diffraction （XRD） pat- terns showed that anatase TiO2 with better cystallinity is obtained under the hydrothermal conditions of 160℃, and the structure is reserved even after post-treated at the temperature of 900℃, but when the treated temperature increased to 1 100 ℃, the phase transformed to rutile TiO2. Field emission scanning electron microscopy （FESEM） and transmission electron microscopy（TEM） images indicated that the obtained anatase phase TiO2 samples are hollow microspheres, with the diameter of 1 μm, which are assembled by TiO2 nanoparticles with the size of 20 - 30 nm. Photocatalytic test showed that the anatase phase TiO2 samples have better photocatalytic and oxidation properties, with the degradation of rhodamine B solution being about 100%after 25 min.