论文部分内容阅读
以Stber法制备的单分散SiO_2为核,采用溶胶-凝胶、界面沉积和表面活性剂模板法制备了多元核-壳结构微球SiO_2@TiO_2-Ag@SiO_2,利用FTIR、SEM、XRD、UV-Vis漫反射、N2吸附-脱附、XPS对其结构和形貌进行了表征。考察了SiO_2@TiO_2-Ag@SiO_2微球对亚甲基蓝(MB)和甲基橙(MO)溶液的脱色性能。结果显示:微球粒径约为600 nm,微球平均孔径、比表面积分别为2.00 nm、72.73 m2/g;受最外层SiO_2影响,XRD未观察到锐钛矿相TiO_2的特征衍射峰;紫外可见漫反射光谱证实,SiO_2@TiO_2-Ag@SiO_2在365 nm处有吸收。在模拟太阳光照射100 min下,SiO_2@TiO_2-Ag@SiO_2微球对MB的光催化脱色率为97.6%;自然光下,对MO的絮凝沉淀时间为40min,脱色率达99.7%。
Based on the monodisperse SiO_2 prepared by Stöber method, the multi-core-shell microspheres SiO_2 @ TiO_2-Ag @ SiO_2 were prepared by sol-gel, interface deposition and surfactant template methods. , UV-Vis diffuse reflectance, N2 adsorption-desorption, XPS were used to characterize their structure and morphology. The decolorization performance of SiO_2 @ TiO_2-Ag @ SiO_2 microspheres on methylene blue (MB) and methyl orange (MO) solution was investigated. The results show that the microspheres have a size of about 600 nm, the average pore diameter and specific surface area of the microspheres are 2.00 nm and 72.73 m2 / g, respectively. The XRD shows no characteristic diffraction peaks of anatase phase TiO_2. UV-visible diffuse reflectance spectroscopy confirmed that SiO_2 @ TiO_2-Ag @ SiO_2 has absorption at 365 nm. The photocatalytic decolorization rate of MB for SiO_2 @ TiO_2-Ag @ SiO_2 microspheres was 97.6% under simulated sunlight irradiation for 100 min. Under natural light, the flocculation and settling time for MO was 40 min and the decolorization rate was 99.7%.