| 摘要: |
| 采用两步法制备了氟修饰疏水性F-SiO2@TiO2材料.以三乙氧基氟硅烷(TEFS)为硅源,采用后嫁接的方法在短孔道MCM-41小球表面引入F原子,再利用醇热法在F-MCM-41小球表面生长TiO2纳米晶颗粒.利用透射电子显微镜(TEM)、X射线粉末散射(XRD)、X射线光电子能谱(XPS)、N2气吸脱附等手段表征了材料的物相组成和表面结构.研究表明:所制备的氟修饰F-SiO2@TiO2纳米复合材料为核壳结构,具有较大的比表面积、较好的介孔结构及较佳的热稳定性.同时,TiO2纳米颗粒在F-MCM-41小球表面分散均匀、结晶度高、颗粒尺寸小且均一、与F-SiO2结合牢固.重量吸附实验和光催化实验进一步证实F修饰可抑制水的吸附有利于提高F-SiO2@TiO2材料的疏水性和对气相有机污染物的光催化性能. |
| 关键词: 介孔SiO2 TiO2 F修饰 亲疏水性 光催化 |
| DOI： |
| 分类号: |
| 基金项目:国家自然科学基金(21377088,51572174);霍英东基金会(142022) |
|
| The effect of fluorine modification on hydrophilic-hydrophobic properties and photocatalytic performance of SiO2@TiO2 hybrids |
|
WANG Honghui, HE Jiehong, QIAO Jieqiong, XIE Zuotian, ZHU Jian
|
|
Key Laboratory of Resource Chemistry,Ministry of Education,College of Life and Environmental Sciences,Shanghai Normal University
|
| Abstract: |
| Hydrophobic fluorine modified SiO2@TiO2 hybrids were prepared by a post-grafting method followed by a solvothermal method.F-SiO2 precursor was firstly prepared via a simple post-grafting process using triethoxyfluorosilane as a fluorine-containing silylation agent.Then,nano-sized TiO2 particles were formed on the surface of F-SiO2 to form F-SiO2@TiO2 by a solvothermal process.Different characterizations were performed to show the detailed structure of F-SiO2@TiO2 hybrids such as TEM,XRD,XPS and N2 adsorption-desorption etc.The results show that F-SiO2@TiO2 hybrids with core-shell structure own large surface area,well-ordered mesoporous structure as well as high thermostability.On the other hand,the well dispersed TiO2 particles with small and similar size display high crystallinity and strong interaction with F-SiO2.Both the adsorption and the photocatalytic experiments toward degradation of organic compounds show that increasing the content of TEFS reagent could suppress the adsorption of H2O on the surface of F-SiO2@TiO2 hybrid.As a result,the F-SiO2@TiO2 samples display higher hydrophobic properties and higher photocatalytic activities than SiO2@TiO2 sample. |
| Key words: mesoporous SiO2 TiO2 F modification hydrophobic property photocatalysis |
Editorial Board