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目前二氧化钛(TiO_2)空心微球制备方法主要为模板法,步骤繁琐,模板难去除。采用一步水热法制备暴露(001)晶面的TiO_2空心微球,水热温度为200℃,水热时间12h,通过改变氟和钛的物质的量的比来控制TiO_2的形貌。采用XRD、FESEM、TEM、EDS等方法对样品的晶体结构、微观形貌进行表征。以罗丹明B为模拟污染物,采用紫外分光光计测定污染物的吸光度,评价了样品紫外光光催化降解罗丹明B的活性,当氟和钛的物质量的比值为2时,制备得到具有暴露(001)晶面的TiO_2空心微球,并且表现出了最佳的光催化活性。光催化反应40min,对10mg/L的罗丹明B的降解率达到95%。
At present, the preparation methods of titanium dioxide (TiO2) hollow microspheres mainly include the template method, the tedious steps and the difficult removal of the template. One-step hydrothermal method was used to prepare TiO 2 hollow microspheres with exposed (001) crystal planes. The hydrothermal temperature was 200 ℃ and the hydrothermal time was 12 h. The morphology of TiO 2 was controlled by changing the ratio of fluorine to titanium. The crystal structure and microstructure of the samples were characterized by XRD, FESEM, TEM and EDS. Rhodamine B was used as a simulated pollutant. The absorbance of the pollutants was measured by UV spectrophotometer. The photocatalytic activity of Rhodamine B was evaluated by ultraviolet light. When the ratio of the mass of fluorine and titanium was 2, The TiO 2 hollow microspheres with (001) crystal plane were exposed and showed the best photocatalytic activity. Photocatalytic reaction 40min, the degradation rate of 10mg / L rhodamine B 95%.