光敏性多元核-壳微球絮凝剂的制备  

Preparation of Photosensitive Multi Core-shell Microspheres Flocculant

作　　者：移永杰 柳宏伟[1] 陈潇琪 常玥[1,2,3] 查飞[1] 

机构地区：[1]西北师范大学化学化工学院,甘肃兰州730070 [2]生态环境相关高分子材料教育部重点实验室西北师范大学,甘肃兰州730070 [3]甘肃省高分子材料重点实验室西北师范大学,甘肃兰州730070

出　　处：《精细化工》2017年第11期1226-1232,共7页Fine Chemicals

基　　金：国家自然科学基金项目(21161017)~~

摘　　要：以Stber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%。Monodisperse SiO_2 nanoparticles were first prepared by Stber mothod,and then it was used as core to synthesize SiO_2@TiO_2-Ag@SiO_2 core-shell microspheres via sol-gel method,interface deposition method and surfactant template method in turn.The structure and morphology of microspheres were investigated and analyzed by FTIR,SEM,XRD,UV-visible diffuse reflectance spectroscopy（UV-vis DRS）,N2 adsorption desorption and XPS.Subsequently,the prepared SiO_2@TiO_2-Ag@SiO_2 microspheres were used to a flocculant to remove methylene blue（MB） and methyl orange（MO）.The results showed that the SiO_2@TiO_2-Ag@SiO_2 microspheres had particle size of 600 nm,average pore size of 2 nm,and specific surface area of 72.73 m^2/g,respectively.The diffraction peaks of anatase TiO_2 were not observed in XRD due to the influence of the outer layer SiO_2.UV-vis DRS confirmed that the absorption peak of core-shell microsphere appeared at 365 nm.Under simulated solar light source irradiation for 100 min,the photocatalytic decolorization rate of MB was 97.6%.Whereas under natural light,after flocculation and precipitation for 40 min,the decolorization rate of MO reached 99.7%.

关 键 词：多元核-壳结构 光催化活性 絮凝 亚甲基蓝 甲基橙 功能材料 

分 类 号：O611.3[理学—无机化学]