摘要
采用溶胶-凝胶法工艺在二氧化硅(SiO_2)纳米颗粒微球表面包覆二氧化钛(TiO_2),制备合成核-壳型SiO_2@TiO_2复合纳米颗粒。使用X射线衍射仪(XRD)、扫描电子显微镜(SEM)和透射电子显微镜(TEM)表征样品的样貌情况、表面化学成分和分散性。使用紫外-可见分光光度计(UV-Vis)测定200℃度下不同退火时间下SiO_2@TiO_2复合纳米颗粒对亚甲基蓝的光催化降解后的吸光度从而分析SiO_2@TiO_2复合纳米颗粒的光催化性能。实验结果表明,SiO_2@TiO_2纳米复合粒子形貌均匀,分散性好,退火时间在48h^72h光催化活最佳。
The core-shell SiO2@TiO2 composite nanoparticles were prepared by sol-gel process with SiO2（TiO2）coated on the surface of silica nanoparticles.X ray diffraction（XRD）,scanning electron microscopy（SEM）and transmission electron microscopy（TEM）were used to characterize the appearance,surface chemical composition and dispersibility of the samples.The UV visible spectrophotometer（UV-Vis）is used to determine the the absorbance of methylene blue after photocatalytic degradation from SiO2@TiO2 nanocomposite particles in different annealing time and 200 DEG C so as to analyze the photocatalytic activity of SiO2@TiO2 composite nanoparticles.The experimental results show that SiO2@TiO2 nanocomposite particles have uniform morphology and good dispersion,and the photocatalytic activity of annealing time is best at 48 h^72 h.
出处
《山西化工》
2017年第5期37-40,65,共5页
Shanxi Chemical Industry
