光敏性多元核-壳微球絮凝剂的制备

发布时间：2018-03-12 22:49

本文选题：多元核-壳结构　切入点：光催化活性　出处：《精细化工》2017年11期 　论文类型：期刊论文

【摘要】：以St銉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%。
[Abstract]:The monodisperse SiO_2 prepared by St ber method was used as nucleus and sol-gel was used. Multicomponent core-shell structure microspheres SiO2TiO2-AgSiO2have been prepared by interfacial deposition and surfactant template method. The structure and morphology of SiO2TiO2TiO2-AgSiO2have been characterized by FTIRSEMU UV-Vis diffuse reflectance N2 adsorption and desorption XPS. The results show that the diameter of the microspheres is about 600 nm, and the average pore size of the microspheres is about 600 nm. The specific surface area is 2.00 nm ~ (-1) 72.73 m ~ (2 / g) respectively. The characteristic diffraction peak of anatase phase TiO_2 is not observed under the influence of outermost SiO_2. The UV-Vis diffuse reflectance spectra confirm that SiO2TiO2-Ag@ SiO2 has absorption at 365nm. The photocatalytic decolorization rate of SiO2TiO2-AgSTAO2 microspheres to MB is 97.6m under simulated solar irradiation of 100nm, and the flocculating precipitation time of MO is 40min. the decolorization rate of MO is 99.70.In the natural light, the flocculation time of MO is 40 mins and the decolorization rate is 99.70.The photocatalytic decolorization rate of SiO2TiO2-AgORSiO2 microspheres is 97.6%.
【作者单位】：西北师范大学化学化工学院;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;甘肃省高分子材料重点实验室西北师范大学;
【基金】：国家自然科学基金项目(21161017)~~
【分类号】：O643.36;TB34

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